1
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Szlosek R, Seidl M, Balázs G, Scheer M. A General Pathway towards NHC ⋅ GaH 2 (OTf) Adducts - The Key for the Synthesis of NHC-Stabilized Cationic 13/15 Chain Compounds of Gallium. Chemistry 2023; 29:e202301752. [PMID: 37401824 DOI: 10.1002/chem.202301752] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Revised: 07/03/2023] [Accepted: 07/04/2023] [Indexed: 07/05/2023]
Abstract
A general pathway towards NHC (NHC=N-heterocyclic carbene)-stabilized galliummonotriflates NHC ⋅ GaH2 (OTf) (NHC=IDipp, 1 a; IPr2 Me2 , 1 b; IMes, 1 c; IDipp=1,3-bis(2,6-diisopropylphenyl)-imidazolin-2-ylidene, IPr2 Me2 =1,3-bis-(diisopropyl)-4,5-dimethyl-imidazolin-2-ylidene, IMes=1,3-bis(2,4,6-trimethylphenyl)-imidazolin-2-ylidene) is reported. Quantum chemical calculations give detailed insight into the underlying reaction pathway. The obtained NHC ⋅ GaH2 (OTf) compounds were employed in reactions with donor-stabilized pnictogenylboranes to synthesize the elusive cationic parent 13/15/13 chain compounds [IDipp ⋅ GaH2 ER2 E'H2 ⋅ D][OTf] (3 a: D=IDipp, E=P, E'=B, R=H; 3 b: D=NMe3 , E=P, E'=B, R=H, 3 c: D=NMe3 , E=P, E'=B, R=Ph, 3 d: D=IDipp, E=P, E'=Ga, R=H). Supporting computational studies highlight the electronic features of the products.
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Affiliation(s)
- Robert Szlosek
- Institut für Anorganische Chemie, Universität Regensburg, 93053, Regensburg, Germany
| | - Michael Seidl
- Institut für Anorganische Chemie, Universität Regensburg, 93053, Regensburg, Germany
| | - Gábor Balázs
- Institut für Anorganische Chemie, Universität Regensburg, 93053, Regensburg, Germany
| | - Manfred Scheer
- Institut für Anorganische Chemie, Universität Regensburg, 93053, Regensburg, Germany
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2
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Noh HC, Kim CE, Lee K, Kim D, Lee PH. Iridium-Catalyzed Regioselective B(4)-Alkenylation and B(3,5)-Dialkenylation of o-Carboranes. Org Lett 2023; 25:6643-6648. [PMID: 37646852 DOI: 10.1021/acs.orglett.3c02410] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Abstract
Iridium(I)-catalyzed regioselective B(4)-alkenylation has been developed from o-carboranyl sulfoxonium ylides and alkynes through B(4)-H activation. The sequential B(4)- and B(6)-alkenylation afforded B(3,5)-dialkenylated o-carboranyl sulfoxonium ylides in one pot. Eventually, two alkenyl groups, the same or different, were introduced at positions 3 and 5 of the carborane. Sulfoxonium ylide used as a directing group remains available for further functionalization and is converted to B-alkenylated o-carboranyl trichloromethyl ketones.
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Affiliation(s)
- Hee Chan Noh
- Department of Chemistry, Kangwon National University, Chuncheon 24341, Republic of Korea
| | - Cheol-Eui Kim
- Department of Chemistry, Kangwon National University, Chuncheon 24341, Republic of Korea
| | - Kyungsup Lee
- Department of Chemistry, Kangwon National University, Chuncheon 24341, Republic of Korea
| | - Dongwook Kim
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, Republic of Korea
| | - Phil Ho Lee
- Department of Chemistry, Kangwon National University, Chuncheon 24341, Republic of Korea
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3
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Akram MO, Martin CD, Dutton JL. The Effect of Carborane Substituents on the Lewis Acidity of Boranes. Inorg Chem 2023; 62:13495-13504. [PMID: 37560972 DOI: 10.1021/acs.inorgchem.3c01872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/11/2023]
Abstract
The Lewis acidity of primary, secondary, and tertiary boranes with phenyl, pentafluorophenyl, and all three isomers of the C-substituted icosahedral carboranes (ortho, meta, and para) was investigated by computing their fluoride, hydride, and ammonia affinities as well as their global electrophilicity indices and LUMO energies. From these calculations, it was determined that the substituent effects on the Lewis acidity of these boranes follow the trend of ortho-carborane > meta-carborane > para-carborane > C6F5 > C6H5.
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Affiliation(s)
- Manjur O Akram
- Baylor University, Department of Chemistry and Biochemistry, One Bear Place #97348, Waco, Texas 76798, United States
| | - Caleb D Martin
- Baylor University, Department of Chemistry and Biochemistry, One Bear Place #97348, Waco, Texas 76798, United States
| | - Jason L Dutton
- La Trobe University, Department of Chemistry, La Trobe Institute for Molecular Science, Melbourne, Victoria 3086,Australia
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4
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Akram MO, Tidwell JR, Dutton JL, Martin CD. Bis(1-Methyl-ortho-Carboranyl)Borane. Angew Chem Int Ed Engl 2023; 62:e202307040. [PMID: 37338991 DOI: 10.1002/anie.202307040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Revised: 06/19/2023] [Accepted: 06/20/2023] [Indexed: 06/22/2023]
Abstract
The Lewis superacid, bis(1-methyl-ortho-carboranyl)borane, is rapidly accessed in two steps. It is a very effective hydroboration reagent capable of B-H addition to alkenes, alkynes, and cyclopropanes. To date, this is the first identified Lewis superacidic secondary borane and most reactive neutral hydroboration reagent.
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Affiliation(s)
- Manjur O Akram
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, TX, 76798, USA
| | - John R Tidwell
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, TX, 76798, USA
| | - Jason L Dutton
- Department of Biochemistry and Chemistry, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia
| | - Caleb D Martin
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, TX, 76798, USA
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5
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Vashisth K, Dutta S, Akram MO, Martin CD. Examining the reactivity of tris( ortho-carboranyl)borane with Lewis bases and application in frustrated Lewis pair Si-H bond cleavage. Dalton Trans 2023. [PMID: 37377440 DOI: 10.1039/d3dt01557b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/29/2023]
Abstract
Reactions of tris(ortho-carboranyl)borane with Lewis bases reveals only small bases bind. The tremendous bulk and Lewis acidity is leveraged in frustrated Lewis pair Si-H cleavage with a wider range of Lewis bases and greater efficacy than B(C6F5)3.
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Affiliation(s)
- Kanika Vashisth
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798, USA.
| | - Sanjay Dutta
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798, USA.
| | - Manjur O Akram
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798, USA.
| | - Caleb D Martin
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798, USA.
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6
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Schulz J, Clauss R, Kazimir A, Holzknecht S, Hey-Hawkins E. On the Edge of the Known: Extremely Electron-Rich (Di)Carboranyl Phosphines. Angew Chem Int Ed Engl 2023; 62:e202218648. [PMID: 36573025 DOI: 10.1002/anie.202218648] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Indexed: 12/28/2022]
Abstract
The syntheses of the first B9-connected carboranylphosphines (B9-Phos) featuring two carboranyl moieties as well as access to B9-Phos ligands with bulky electron-donating substituents, previously deemed unattainable, is reported. The electrochemical properties of the B9-Phos ligands were investigated, revealing the ability of the mesityl derivatives to form stabilized phosphoniumyl radical cations. The B9-Phos ligands display an extremely electron-releasing character surpassing that of alkyl phosphines and commonly used N-heterocyclic carbenes. This is demonstrated by their very small Tolman electronic parameters (TEPs) as well as extremely low P-Se coupling constants. Cone angles and buried volumes attest to the high steric demand exerted by the (di)carboranyl phosphines. The dicarboranyl phosphine AuI complexes show superior catalytic performance in the hydroamination of alkynes compared to the monocarboranyl phosphine analogs.
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Affiliation(s)
- Jan Schulz
- Leipzig University, Faculty of Chemistry and Mineralogy, Institute of Inorganic Chemistry, Johannisallee 29, 04103, Leipzig, Germany
| | - Reike Clauss
- Leipzig University, Faculty of Chemistry and Mineralogy, Institute of Inorganic Chemistry, Johannisallee 29, 04103, Leipzig, Germany
| | - Aleksandr Kazimir
- Leipzig University, Faculty of Chemistry and Mineralogy, Institute of Inorganic Chemistry, Johannisallee 29, 04103, Leipzig, Germany
| | - Sieglinde Holzknecht
- Leipzig University, Faculty of Chemistry and Mineralogy, Institute of Inorganic Chemistry, Johannisallee 29, 04103, Leipzig, Germany
| | - Evamarie Hey-Hawkins
- Leipzig University, Faculty of Chemistry and Mineralogy, Institute of Inorganic Chemistry, Johannisallee 29, 04103, Leipzig, Germany
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7
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Wang L, Zhou C, Dai Y, Hou Y, Yan J, Li Y, Yuan Y. Synthesis and Characterization of New
o
‐Carboranes‐Based Aggregation‐Induced Emission Molecules with Ultra‐Large Stokes Shift. ChemistrySelect 2023. [DOI: 10.1002/slct.202204063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Li Wang
- Key Laboratory of Molecule Synthesis and Function Discovery (Fujian Province University) Department of Chemistry Fuzhou University Fuzhou 350108 China
| | - Cheng‐Sheng Zhou
- Key Laboratory of Molecule Synthesis and Function Discovery (Fujian Province University) Department of Chemistry Fuzhou University Fuzhou 350108 China
| | - Yu‐Han Dai
- Key Laboratory of Molecule Synthesis and Function Discovery (Fujian Province University) Department of Chemistry Fuzhou University Fuzhou 350108 China
| | - Yu‐Liang Hou
- China State Construction Port Engineering Group Corp., Ltd Department Qingdao 266000 China
| | - Jian‐Feng Yan
- Key Laboratory of Molecule Synthesis and Function Discovery (Fujian Province University) Department of Chemistry Fuzhou University Fuzhou 350108 China
| | - Yuan‐Ming Li
- Key Laboratory of Molecule Synthesis and Function Discovery (Fujian Province University) Department of Chemistry Fuzhou University Fuzhou 350108 China
| | - Yao‐Feng Yuan
- Key Laboratory of Molecule Synthesis and Function Discovery (Fujian Province University) Department of Chemistry Fuzhou University Fuzhou 350108 China
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8
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Schulz J, Sárosi MB, Hey‐Hawkins E. Exploring the Reactivity of B‐Connected Carboranylphosphines in Frustrated Lewis Pair Chemistry: A New Frame for a Classic System. Chemistry 2022; 28:e202200531. [PMID: 35472172 PMCID: PMC9320892 DOI: 10.1002/chem.202200531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Indexed: 11/15/2022]
Abstract
The primary phosphines MesPH2 and tBuPH2 react with 9‐iodo‐m‐carborane yielding B9‐connected secondary carboranylphosphines 1,7‐H2C2B10H9‐9‐PHR (R=2,4,6‐Me3C6H2 (Mes; 1
a), tBu (1
b)). Addition of tris(pentafluorophenyl)borane (BCF) to 1
a, b resulted in the zwitterionic compounds 1,7‐H2C2B10H9‐9‐PHR(p‐C6F4)BF(C6F5)2 (2
a, b) through nucleophilic para substitution of a C6F5 ring followed by fluoride transfer to boron. Further reaction with Me2SiHCl prompted a H−F exchange yielding the zwitterionic compounds 1,7‐H2C2B10H9‐9‐PHR(p‐C6F4)BH(C6F5)2 (3
a, b). The reaction of 2
a, b with one equivalent of R'MgBr (R’=Me, Ph) gave the extremely water‐sensitive frustrated Lewis pairs 1,7‐H2C2B10H9‐9‐PR(p‐C6F4)B(C6F5)2 (4
a, b). Hydrolysis of the B−C6F4 bond in 4
a, b gave the first tertiary B‐carboranyl phosphines with three distinct substituents, 1,7‐H2C2B10H9‐9‐PR(p‐C6F4H) (5
a, b). Deprotonation of the zwitterionic compounds 2
a, b and 3
a, b formed anionic phosphines [1,7‐H2C2B10H9‐9‐PR(p‐C6F4)BX(C6F5)2]−[DMSOH]+ (R=Mes, X=F (6
a), R=tBu, X=F (6
b); R=Mes, X=H (7
a), R=tBu, X=H (7
b)). Reaction of 2
a, b with an excess of Grignard reagents resulted in the addition of R’ at the boron atom yielding the anions [1,7‐H2C2B10H9‐9‐PR(p‐C6F4)BR’(C6F5)2]− (R=Mes, R’=Me (8
a), R=tBu, R’=Me (8
b); R=Mes, R’=Ph (9
a), R=tBu, R’=Ph (9
b)) with [MgBr(Et2O)n]+ as counterion. The ability of the zwitterionic compounds 3
a, b to hydrogenate imines as well as the Brønsted acidity of 3
a were investigated.
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Affiliation(s)
- Jan Schulz
- Leipzig University, Faculty of Chemistry and Mineralogy Institute of Inorganic Chemistry Johannisallee 29 04103 Leipzig Germany
| | - Menyhárt B. Sárosi
- Leipzig University, Faculty of Chemistry and Mineralogy Wilhelm-Ostwald-Institute for Physical and Theoretical Chemistry Linnéstraße 2 04103 Leipzig Germany
| | - Evamarie Hey‐Hawkins
- Leipzig University, Faculty of Chemistry and Mineralogy Institute of Inorganic Chemistry Johannisallee 29 04103 Leipzig Germany
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9
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Dai C, Huang Y, Zhu J. Predicting Dinitrogen Activation by Carborane-Based Frustrated Lewis Pairs. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00069] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Chenshu Dai
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Yuanyuan Huang
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Jun Zhu
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
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10
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Ma YN, Gao Y, Ma Y, Wang Y, Ren H, Chen X. Palladium-Catalyzed Regioselective B(9)-Amination of o-Carboranes and m-Carboranes in HFIP with Broad Nitrogen Sources. J Am Chem Soc 2022; 144:8371-8378. [PMID: 35499359 DOI: 10.1021/jacs.2c03031] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Amination of carboranes has a good application prospect in organic and pharmaceutical synthesis. However, the current methods used for this transformation suffer from limitations. Herein, we report a practical method for a highly regioselective formation of a B-N bond by Pd(II)-catalyzed B(9)-H amination of o- and m-carboranes in hexafluoroisopropanol (HFIP) with different nitrogen sources under air atmosphere. The silver salt and HFIP solvent play critical roles in the present protocol. The mechanistic study reveals that the silver salt acts as a Lewis acid to promote the electrophilic palladation step by forming a heterobimetallic active catalyst PdAg(OAc)3; the strong hydrogen-bond-donating ability and low nucleophilicity of HFIP enhance the electrophilic ability of Pd(II). It is believed that these N-containing carboranes are potentially of great importance in the synthesis of new pharmaceuticals.
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Affiliation(s)
- Yan-Na Ma
- College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China
| | - Yan Gao
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, Henan Normal University, Xinxiang, Henan 453007, China
| | - Yubin Ma
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, Henan Normal University, Xinxiang, Henan 453007, China
| | - Yan Wang
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, Henan Normal University, Xinxiang, Henan 453007, China
| | - Huazhan Ren
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, Henan Normal University, Xinxiang, Henan 453007, China
| | - Xuenian Chen
- College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China.,School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, Henan Normal University, Xinxiang, Henan 453007, China
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11
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Wang Y, Gao Y, Guo W, Zhao Q, Ma YN, Chen X. Highly selective electrophilic B(9)-amination of o-carborane driven by HOTf and HFIP. Org Chem Front 2022. [DOI: 10.1039/d2qo00732k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient B(9) electrophilic amination of o-carboranes with azodicarboxylates, promoted by a Brønsted acid and HFIP, was developed.
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Affiliation(s)
- Yan Wang
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, Henan Normal University, Xinxiang, Henan 453007, China
| | - Yan Gao
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, Henan Normal University, Xinxiang, Henan 453007, China
| | - Wenjing Guo
- College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China
| | - Qianyi Zhao
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, Henan Normal University, Xinxiang, Henan 453007, China
| | - Yan-Na Ma
- College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China
| | - Xuenian Chen
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, Henan Normal University, Xinxiang, Henan 453007, China
- College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China
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12
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Jeans RJ, Rosair GM, Welch AJ. C, C'-Ru to C, B'-Ru isomerisation in bis(phosphine)Ru complexes of [1,1'-bis( ortho-carborane)]. Chem Commun (Camb) 2021; 58:64-67. [PMID: 34873603 DOI: 10.1039/d1cc06119d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report herein the first example of the controlled isomerisation of a C,C'-bound (to metal) bis(ortho-carborane) ligand to C,B'-bound with no other change in the molecule. Since the C and B vertices of carboranes have different electron-donating properties this transformation allows the reactivity of the metal centre to be fine-tuned.
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Affiliation(s)
- Rebekah J Jeans
- Institute of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, UK.
| | - Georgina M Rosair
- Institute of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, UK.
| | - Alan J Welch
- Institute of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, UK.
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13
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Weitkamp RF, Neumann B, Stammler H, Hoge B. Phosphorus-Containing Superbases: Recent Progress in the Chemistry of Electron-Abundant Phosphines and Phosphazenes. Chemistry 2021; 27:10807-10825. [PMID: 34032319 PMCID: PMC8362139 DOI: 10.1002/chem.202101065] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Indexed: 01/11/2023]
Abstract
The renaissance of Brønsted superbases is primarily based on their pronounced capacity for a large variety of chemical transformations under mild reaction conditions. Four major set screws are available for the selective tuning of the basicity: the nature of the basic center (N, P, …), the degree of electron donation by substituents to the central atom, the possibility of charge delocalization, and the energy gain by hydrogen bonding. Within the past decades, a plethora of neutral electron-rich phosphine and phosphazene bases have appeared in the literature. Their outstanding properties and advantages over inorganic or charged bases have now made them indispensable as auxiliary bases in deprotonation processes. Herein, an update of the chemistry of basic phosphines and phosphazenes is given. In addition, due to widespread interest, their use in catalysis or as ligands in coordination chemistry is highlighted.
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Affiliation(s)
- Robin F. Weitkamp
- Centrum für Molekulare MaterialienFakultät für ChemieUniversität BielefeldUniversitätsstraße 2533615BielefeldGermany
| | - Beate Neumann
- Centrum für Molekulare MaterialienFakultät für ChemieUniversität BielefeldUniversitätsstraße 2533615BielefeldGermany
| | - Hans‐Georg Stammler
- Centrum für Molekulare MaterialienFakultät für ChemieUniversität BielefeldUniversitätsstraße 2533615BielefeldGermany
| | - Berthold Hoge
- Centrum für Molekulare MaterialienFakultät für ChemieUniversität BielefeldUniversitätsstraße 2533615BielefeldGermany
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14
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Sivaev IB, Stogniy MY, Bregadze VI. Transition metal complexes with carboranylphosphine ligands. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.213795] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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15
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Zhang C, Wang J, Su W, Lin Z, Ye Q. Synthesis, Characterization, and Density Functional Theory Studies of Three-Dimensional Inorganic Analogues of 9,10-Diboraanthracene-A New Class of Lewis Superacids. J Am Chem Soc 2021; 143:8552-8558. [PMID: 33984238 DOI: 10.1021/jacs.1c03057] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The three-dimensional inorganic analogues of 9,10-diboraanthracene, B2X2(C2B10H10)2 (X = Cl, 1; X = Br, 2), were attained by salt elimination of Li2C2B10H10 and trihaloboranes. The methyl- and phenyl-substituted compounds B2Me2(C2B10H10)2 (3) and B2Ph2(C2B10H10)2 (4) were obtained by treating 1 or 2 with the corresponding Grignard reagents. These compounds were fully characterized by NMR, cyclic voltammetry (CV), IR, and single-crystal X-ray diffraction analyses. Experimental (CV and Gutmann-Beckett method) and computational (fluoride ion affinity, hydride ion affinity and LUMO energy) results suggest that the order of Lewis acidity is 2 > 1 > 4 > 3 > SbF5. Treatment of 1 or 2 with HSiEt3 gave a rare neutral borane-silane adduct, (Et3SiH)2B2H2(C2B10H10)2 (5). The equilibrium of 5 in solution was thoroughly investigated by spectroscopy and quantum calculations.
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Affiliation(s)
- Chonghe Zhang
- Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, P. R. China
| | - Junyi Wang
- Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, P. R. China.,Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Wei Su
- Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, P. R. China
| | - Zhenyang Lin
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Qing Ye
- Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, P. R. China
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16
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Saretz S, Basset G, Useini L, Laube M, Pietzsch J, Drača D, Maksimović-Ivanić D, Trambauer J, Steiner H, Hey-Hawkins E. Modulation of γ-Secretase Activity by a Carborane-Based Flurbiprofen Analogue. Molecules 2021; 26:2843. [PMID: 34064783 PMCID: PMC8151329 DOI: 10.3390/molecules26102843] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 04/26/2021] [Accepted: 05/06/2021] [Indexed: 12/25/2022] Open
Abstract
All over the world, societies are facing rapidly aging populations combined with a growing number of patients suffering from Alzheimer's disease (AD). One focus in pharmaceutical research to address this issue is on the reduction of the longer amyloid-β (Aβ) fragments in the brain by modulation of γ-secretase, a membrane-bound protease. R-Flurbiprofen (tarenflurbil) was studied in this regard but failed to show significant improvement in AD patients in a phase 3 clinical trial. This was mainly attributed to its low ability to cross the blood-brain barrier (BBB). Here, we present the synthesis and in vitro evaluation of a racemic meta-carborane analogue of flurbiprofen. By introducing the carborane moiety, the hydrophobicity could be shifted into a more favourable range for the penetration of the blood-brain barrier, evident by a logD7.4 value of 2.0. Furthermore, our analogue retained γ-secretase modulator activity in comparison to racemic flurbiprofen in a cell-based assay. These findings demonstrate the potential of carboranes as phenyl mimetics also in AD research.
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Affiliation(s)
- Stefan Saretz
- Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, D-04103 Leipzig, Germany; (S.S.); (L.U.)
- Chemische Biologie, Helmholtz-Zentrum für Infektionsforschung, Inhoffenstraße 7, D-38124 Braunschweig, Germany
| | - Gabriele Basset
- Biomedical Center Munich (BMC), Metabolic Biochemistry, Ludwig-Maximilians-University, Feodor-Lynen-Straße 17, D-81377 München, Germany; (G.B.); (J.T.); (H.S.)
| | - Liridona Useini
- Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, D-04103 Leipzig, Germany; (S.S.); (L.U.)
| | - Markus Laube
- Department of Radiopharmaceutical and Chemical Biology, Institute of Radiopharmaceutical Cancer Research, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Bautzner Landstraße 400, D-01328 Dresden, Germany; (M.L.); (J.P.)
| | - Jens Pietzsch
- Department of Radiopharmaceutical and Chemical Biology, Institute of Radiopharmaceutical Cancer Research, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Bautzner Landstraße 400, D-01328 Dresden, Germany; (M.L.); (J.P.)
- Faculty of Chemistry and Food Chemistry, School of Science, Technische Universität Dresden, 01069 Dresden, Germany
| | - Dijana Drača
- Department of Immunology, Institute for Biological Research “Siniša Stanković”, National Institute of Republic of Serbia, University of Belgrade, Bul. Despota Stefana 142, 11060 Belgrade, Serbia; (D.D.); (D.M.-I.)
| | - Danijela Maksimović-Ivanić
- Department of Immunology, Institute for Biological Research “Siniša Stanković”, National Institute of Republic of Serbia, University of Belgrade, Bul. Despota Stefana 142, 11060 Belgrade, Serbia; (D.D.); (D.M.-I.)
| | - Johannes Trambauer
- Biomedical Center Munich (BMC), Metabolic Biochemistry, Ludwig-Maximilians-University, Feodor-Lynen-Straße 17, D-81377 München, Germany; (G.B.); (J.T.); (H.S.)
| | - Harald Steiner
- Biomedical Center Munich (BMC), Metabolic Biochemistry, Ludwig-Maximilians-University, Feodor-Lynen-Straße 17, D-81377 München, Germany; (G.B.); (J.T.); (H.S.)
- German Center for Neurogenerative Diseases (DZNE) Munich, Feodor-Lynen-Straße 17, D-81377 München, Germany
| | - Evamarie Hey-Hawkins
- Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, D-04103 Leipzig, Germany; (S.S.); (L.U.)
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17
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Chen M, Zhao D, Xu J, Li C, Lu C, Yan H. Electrooxidative B−H Functionalization of
nido
‐Carboranes. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202015299] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Meng Chen
- State Key Laboratory of Coordination Chemistry Jiangsu Key Laboratory of Advanced Organic Materials School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 China
| | - Deshi Zhao
- State Key Laboratory of Coordination Chemistry Jiangsu Key Laboratory of Advanced Organic Materials School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 China
| | - Jingkai Xu
- State Key Laboratory of Coordination Chemistry Jiangsu Key Laboratory of Advanced Organic Materials School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 China
| | - Chunxiao Li
- State Key Laboratory of Coordination Chemistry Jiangsu Key Laboratory of Advanced Organic Materials School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 China
| | - Changsheng Lu
- State Key Laboratory of Coordination Chemistry Jiangsu Key Laboratory of Advanced Organic Materials School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 China
| | - Hong Yan
- State Key Laboratory of Coordination Chemistry Jiangsu Key Laboratory of Advanced Organic Materials School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 China
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18
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Chen M, Zhao D, Xu J, Li C, Lu C, Yan H. Electrooxidative B-H Functionalization of nido-Carboranes. Angew Chem Int Ed Engl 2021; 60:7838-7844. [PMID: 33372727 DOI: 10.1002/anie.202015299] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Indexed: 11/07/2022]
Abstract
An atom-economical method for the direct B-H functionalization of nido-carboranes (7,8-nido-C2 B9 H12 - ) has been developed under electrochemical reaction conditions. In this reaction system, anodic oxidation serves as a green alternative for traditional chemical oxidants in the oxidation of nido-carboranes. No transition-metal catalyst is required and different heteroatoms bearing a lone pair are reactive in this transformation. Coupling nido-carboranes with thioethers, selenides, tellurides, N-heterocycles, phosphates, phosphines, arsenides and antimonides demonstrates high site-selectivity and efficiency. Importantly, nido-carboranes can be easily incorporated into drug motifs through this reaction protocol.
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Affiliation(s)
- Meng Chen
- State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China
| | - Deshi Zhao
- State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China
| | - Jingkai Xu
- State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China
| | - Chunxiao Li
- State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China
| | - Changsheng Lu
- State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China
| | - Hong Yan
- State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China
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19
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Mu X, Hopp M, Dziedzic RM, Waddington MA, Rheingold AL, Sletten EM, Axtell JC, Spokoyny AM. Expanding the Scope of Palladium-Catalyzed B - N Cross-Coupling Chemistry in Carboranes. Organometallics 2020; 39:4380-4386. [PMID: 34012188 DOI: 10.1021/acs.organomet.0c00576] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Over the past several years, a number of strategies for the functionalization of dicarba-closo-dodecaboranes (carboranes) have emerged. Despite these developments, B - N bond formation on the carborane scaffold remains a challenge due to the propensity of strong nucleophiles to partially deboronate the parent closo-carborane cluster into the corresponding nido form. Here we show that azide, sulfonamide, cyanate, and phosphoramidate nucleophiles can be straightforwardly cross-coupled onto the B(9) vertices of the o- and m-carborane core from readily accessible precursors without significant deboronation by-products, laying the groundwork for further study into the utility and properties of these new B-aminated carborane species. We further showcase select reactivity of the installed functional groups highlighting some unique features stemming from the combination of the electron-donating B(9) position and the large steric profile of the B-connected carborane substituent.
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Affiliation(s)
- Xin Mu
- Department of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young Drive East, Los Angeles, California 90095, United States
| | - Morgan Hopp
- Department of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young Drive East, Los Angeles, California 90095, United States
| | - Rafal M Dziedzic
- Department of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young Drive East, Los Angeles, California 90095, United States
| | - Mary A Waddington
- Department of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young Drive East, Los Angeles, California 90095, United States
| | - Arnold L Rheingold
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
| | - Ellen M Sletten
- Department of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young Drive East, Los Angeles, California 90095, United States
| | - Jonathan C Axtell
- Department of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young Drive East, Los Angeles, California 90095, United States
| | - Alexander M Spokoyny
- Department of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young Drive East, Los Angeles, California 90095, United States
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20
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Effective Control of the Electron‐donating Ability of Phosphines by using Phosphazenyl and Phosphoniumylidyl Substituents. Z Anorg Allg Chem 2020. [DOI: 10.1002/zaac.202000028] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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21
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Zhang Z, Zhang X, Yuan J, Yue C, Meng S, Chen J, Yu G, Che C. Transition‐Metal‐Catalyzed Regioselective Functionalization of Monophosphino‐
o‐
Carboranes. Chemistry 2020; 26:5037-5050. [DOI: 10.1002/chem.201905647] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2019] [Revised: 01/28/2020] [Indexed: 01/11/2023]
Affiliation(s)
- Zi‐Yang Zhang
- Department Key Laboratory of Pesticide & Chemical BiologyMinistry of EducationChemical Biology CenterCollege of ChemistryCentral China Normal University Wuhan 430079 P. R. China
| | - Xuepeng Zhang
- Laboratory of Computational and Drug DesignSchool of Chemical Biology and BiotechnologyPeking University Shenzhen Graduate School Shenzhen 518055 P. R. China
- School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an 710119 P. R. China
| | - Jia Yuan
- Department Key Laboratory of Pesticide & Chemical BiologyMinistry of EducationChemical Biology CenterCollege of ChemistryCentral China Normal University Wuhan 430079 P. R. China
| | - Chang‐Duo Yue
- Department Key Laboratory of Pesticide & Chemical BiologyMinistry of EducationChemical Biology CenterCollege of ChemistryCentral China Normal University Wuhan 430079 P. R. China
| | - Sixuan Meng
- Department Key Laboratory of Pesticide & Chemical BiologyMinistry of EducationChemical Biology CenterCollege of ChemistryCentral China Normal University Wuhan 430079 P. R. China
| | - Jian Chen
- Department Key Laboratory of Pesticide & Chemical BiologyMinistry of EducationChemical Biology CenterCollege of ChemistryCentral China Normal University Wuhan 430079 P. R. China
| | - Guang‐Ao Yu
- Department Key Laboratory of Pesticide & Chemical BiologyMinistry of EducationChemical Biology CenterCollege of ChemistryCentral China Normal University Wuhan 430079 P. R. China
| | - Chi‐Ming Che
- State Key Laboratory of Synthetic Chemistry andDepartment of ChemistryThe University of Hong Kong Pokfulam Road Hong Kong P. R. China
- HKU Shenzhen Institute of Research and Innovation Shenzhen, Guangdong 518057 P. R. China
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22
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Wilm LF, Mehlmann P, Buß F, Dielmann F. Synthesis and characterization of strongly electron-donating bidentate phosphines containing imidazolin-2-ylidenamino substituents and their electron-rich nickel(0), palladium(II) and gold(I) chelate complexes. J Organomet Chem 2020. [DOI: 10.1016/j.jorganchem.2019.121097] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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23
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Chambrier I, Hughes DL, Jeans RJ, Welch AJ, Budzelaar PHM, Bochmann M. Do Gold(III) Complexes Form Hydrogen Bonds? An Exploration of Au III Dicarboranyl Chemistry. Chemistry 2020; 26:939-947. [PMID: 31721328 DOI: 10.1002/chem.201904790] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Indexed: 01/15/2023]
Abstract
The reaction of 1,1'-Li2 [(2,2'-C2 B10 H10 )2 ] with the cyclometallated gold(III) complex (C^N)AuCl2 afforded the first examples of gold(III) dicarboranyl complexes. The reactivity of these complexes is subject to the trans-influence exerted by the dicarboranyl ligand, which is substantially weaker than that of non-carboranyl anionic C-ligands. In line with this, displacement of coordinated pyridine by chloride is only possible under forcing conditions. While treatment of (C^N)Au{(2,2'-C2 B10 H10 )2 } (2) with triflic acid leads to Au-C rather than Au-N bond protonolysis, aqueous HBr cleaves the Au-N bond to give the pyridinium bromo complex 7. The trans-influence of a series of ligands including dicarboranyl and bis(dicarboranyl) was assessed by means of DFT calculations. The analysis demonstrated that it was not sufficient to rely exclusively on geometric descriptors (calculated or experimental) when attempting to rank ligands for their trans influence. Complex (C^N)Au(C2 B10 H11 )2 containing two non-chelating dicarboranyl ligands was prepared similar to 2. Its reaction with trifluoroacetic acid also leads to Au-N cleavage to give trans-(Hpy^C)Au(OAcF )(C2 B10 H11 )2 (8). In crystals of 8 the pyridinium N-H bond points towards the metal centre, while in 7 it is bent away. The possible contribution of gold(III)⋅⋅⋅H-N hydrogen bonding in these complexes was investigated by DFT calculations. The results show that, unlike the situation for platinum(II), there is no evidence for an energetically significant contribution by hydrogen bonding in the case of gold(III).
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Affiliation(s)
- Isabelle Chambrier
- School of Chemistry, University of East Anglia, Norwich Research Park, Norwich, NR4 7TJ, UK
| | - David L Hughes
- School of Chemistry, University of East Anglia, Norwich Research Park, Norwich, NR4 7TJ, UK
| | - Rebekah J Jeans
- Institute of Chemical Sciences, Heriot-Watt University, Edinburgh, EH14 4AS, UK
| | - Alan J Welch
- Institute of Chemical Sciences, Heriot-Watt University, Edinburgh, EH14 4AS, UK
| | - Peter H M Budzelaar
- Department of Chemistry, University of Naples Federico II, Via Cintia, 80126, Naples, Italy
| | - Manfred Bochmann
- School of Chemistry, University of East Anglia, Norwich Research Park, Norwich, NR4 7TJ, UK
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24
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Rotering P, Wilm LFB, Werra JA, Dielmann F. Pyridinylidenaminophosphines: Facile Access to Highly Electron-Rich Phosphines. Chemistry 2020; 26:406-411. [PMID: 31688978 PMCID: PMC6972615 DOI: 10.1002/chem.201904621] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Indexed: 11/10/2022]
Abstract
Electron-rich tertiary phosphines are valuable species in chemical synthesis. However, their broad application as ligands in catalysis and reagents in stoichiometric reactions is often limited by their costly synthesis. Herein, we report the synthesis and properties of a series of phosphines with 1-alkylpyridin-4-ylidenamino and 1-alkylpyridin-2-ylidenamino substituents that are accessible in a very short and scalable route starting from commercially available aminopyridines and chlorophosphines. The determination of the Tolman electronic parameter (TEP) value reveals that the electron donor ability can be tuned by the substituent pattern at the aminopyridine backbone and it can exceed that of common alkylphosphines and N-heterocyclic carbenes. The potential of the new phosphines as strong nucleophiles in phosphine-mediated transformations is demonstrated by the formation of Lewis base adducts with CO2 and CS2 . In addition, the coordination chemistry of the new phosphines towards CuI , AuI , and PdII metal centers has been explored, and a convenient procedure to introduce the most basic phosphine into metal complexes starting from air-stable phosphonium salt is described.
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Affiliation(s)
- Philipp Rotering
- Institut für Anorganische und Analytische ChemieWestfälische Wilhelms-Universität MünsterCorrensstrasse 3048149MünsterGermany
| | - Lukas F. B. Wilm
- Institut für Anorganische und Analytische ChemieWestfälische Wilhelms-Universität MünsterCorrensstrasse 3048149MünsterGermany
| | - Janina A. Werra
- Institut für Anorganische und Analytische ChemieWestfälische Wilhelms-Universität MünsterCorrensstrasse 3048149MünsterGermany
| | - Fabian Dielmann
- Institut für Anorganische und Analytische ChemieWestfälische Wilhelms-Universität MünsterCorrensstrasse 3048149MünsterGermany
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25
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Sujith S, Nam EB, Lee J, Lee SU, Lee MH. Enhancing the thermally activated delayed fluorescence of nido-carborane-appended triarylboranes by steric modification of the phenylene linker. Inorg Chem Front 2020. [DOI: 10.1039/d0qi00535e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The introduction of a methyl group into the 4-position of the phenylene linker of nido-carborane–triarylborane D–A dyads, i.e., at the ortho position to the nido-carborane cage, largely enhances their thermally activated delayed fluorescence.
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Affiliation(s)
- Surendran Sujith
- Department of Chemistry
- University of Ulsan
- Ulsan 44610
- Republic of Korea
| | - Eun Bi Nam
- Department of Bionano Technology and Department of Applied Chemistry
- Hanyang University
- Ansan 15588
- Republic of Korea
| | - Junseong Lee
- Department of Chemistry
- Chonnam National University
- Gwangju 61186
- Republic of Korea
| | - Sang Uck Lee
- Department of Bionano Technology and Department of Applied Chemistry
- Hanyang University
- Ansan 15588
- Republic of Korea
| | - Min Hyung Lee
- Department of Chemistry
- University of Ulsan
- Ulsan 44610
- Republic of Korea
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26
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Stennett TE, Jayaraman A, Brückner T, Schneider L, Braunschweig H. Hydrophosphination of boron-boron multiple bonds. Chem Sci 2019; 11:1335-1341. [PMID: 34123256 PMCID: PMC8148080 DOI: 10.1039/c9sc05908c] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Five compounds containing boron–boron multiple bonds are shown to undergo hydrophosphination reactions with diphenylphosphine in the absence of a catalyst. With diborenes, the products obtained are highly dependent on the substitution pattern at the boron atoms, with both 1,1- and 1,2-hydrophosphinations observed. With a symmetrical diboryne, 1,2-hydrophosphination yields a hydro(phosphino)diborene. The different mechanistic pathways for the hydrophosphination of diborenes are rationalised with the aid of density functional theory calculations. Compounds containing boron–boron double and triple bonds are shown to undergo uncatalysed hydrophosphination reactions with diphenylphosphine.![]()
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Affiliation(s)
- Tom E Stennett
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany .,Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Arumugam Jayaraman
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany .,Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Tobias Brückner
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany .,Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Lea Schneider
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany .,Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Holger Braunschweig
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany .,Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
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27
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Benton A, Durand DJ, Copeland Z, Watson JD, Fey N, Mansell SM, Rosair GM, Welch AJ. On the Basicity of Carboranylphosphines. Inorg Chem 2019; 58:14818-14829. [DOI: 10.1021/acs.inorgchem.9b02486] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Amanda Benton
- Institute of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, U.K
| | - Derek J. Durand
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
| | - Zachariah Copeland
- Institute of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, U.K
| | - James D. Watson
- Institute of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, U.K
| | - Natalie Fey
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
| | - Stephen M. Mansell
- Institute of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, U.K
| | - Georgina M. Rosair
- Institute of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, U.K
| | - Alan J. Welch
- Institute of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, U.K
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28
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Kellert M, Worm DJ, Hoppenz P, Sárosi MB, Lönnecke P, Riedl B, Koebberling J, Beck-Sickinger AG, Hey-Hawkins E. Modular triazine-based carborane-containing carboxylic acids - synthesis and characterisation of potential boron neutron capture therapy agents made of readily accessible building blocks. Dalton Trans 2019; 48:10834-10844. [PMID: 31246208 DOI: 10.1039/c9dt02130b] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Based on a modular combination of s-triazine, the well-known 9-mercapto-1,7-dicarba-closo-dodecaborane(12) and commercially available carboxylic acids, namely thioglycolic acid, glycine, and Nα-Boc-l-lysine, several carboxylic acid derivatives were synthesised and fully characterised. The thioglycolic acid derivative was introduced into a peptide hormone by solid phase peptide synthesis. High activity and selective internalisation into peptide receptor-expressing cells was observed. With a very high boron content of twenty boron atoms, these derivatives are interesting as selective Boron Neutron Capture Therapy (BNCT) agents.
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Affiliation(s)
- Martin Kellert
- Leipzig University, Faculty of Chemistry and Mineralogy, Institute of Inorganic Chemistry, Johannisallee 29, 04103 Leipzig, Germany.
| | - Dennis J Worm
- Leipzig University, Faculty of Life Sciences, Institute of Biochemistry, Brüderstrasse 34, 04103 Leipzig, Germany
| | - Paul Hoppenz
- Leipzig University, Faculty of Life Sciences, Institute of Biochemistry, Brüderstrasse 34, 04103 Leipzig, Germany
| | - Menyhárt B Sárosi
- Leipzig University, Faculty of Chemistry and Mineralogy, Institute of Inorganic Chemistry, Johannisallee 29, 04103 Leipzig, Germany.
| | - Peter Lönnecke
- Leipzig University, Faculty of Chemistry and Mineralogy, Institute of Inorganic Chemistry, Johannisallee 29, 04103 Leipzig, Germany.
| | - Bernd Riedl
- Bayer AG, Aprather Weg 18A, 42113 Wuppertal, Germany
| | | | - Annette G Beck-Sickinger
- Leipzig University, Faculty of Life Sciences, Institute of Biochemistry, Brüderstrasse 34, 04103 Leipzig, Germany
| | - Evamarie Hey-Hawkins
- Leipzig University, Faculty of Chemistry and Mineralogy, Institute of Inorganic Chemistry, Johannisallee 29, 04103 Leipzig, Germany.
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29
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Kaaz M, Locke RJC, Merz L, Benedikter M, König S, Bender J, Schlindwein SH, Nieger M, Gudat D. Phosphines with N‐Heterocyclic Boryl‐Substituents: Ligands for Coordination Chemistry and Catalysis. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201801081] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Manuel Kaaz
- Institut für Anorganische Chemie University of Stuttgart Pfaffenwaldring 55 70550 Stuttgart Germany
| | - Ralf J. C. Locke
- Institut für Anorganische Chemie University of Stuttgart Pfaffenwaldring 55 70550 Stuttgart Germany
| | - Luisa Merz
- Institut für Anorganische Chemie University of Stuttgart Pfaffenwaldring 55 70550 Stuttgart Germany
| | - Mathis Benedikter
- Institut für Anorganische Chemie University of Stuttgart Pfaffenwaldring 55 70550 Stuttgart Germany
| | - Simon König
- Institut für Anorganische Chemie University of Stuttgart Pfaffenwaldring 55 70550 Stuttgart Germany
| | - Johannes Bender
- Institut für Anorganische Chemie University of Stuttgart Pfaffenwaldring 55 70550 Stuttgart Germany
| | - Simon H. Schlindwein
- Institut für Anorganische Chemie University of Stuttgart Pfaffenwaldring 55 70550 Stuttgart Germany
| | - Martin Nieger
- Department of Chemistry University of Helsinki P.O. Box 55 00014 University of Helsinki Finland
| | - Dietrich Gudat
- Institut für Anorganische Chemie University of Stuttgart Pfaffenwaldring 55 70550 Stuttgart Germany
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30
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Fisher SP, Tomich AW, Lovera SO, Kleinsasser JF, Guo J, Asay MJ, Nelson HM, Lavallo V. Nonclassical Applications of closo-Carborane Anions: From Main Group Chemistry and Catalysis to Energy Storage. Chem Rev 2019; 119:8262-8290. [PMID: 30707011 DOI: 10.1021/acs.chemrev.8b00551] [Citation(s) in RCA: 173] [Impact Index Per Article: 34.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Classically closo-carborane anions, particularly [HCB11H11]- and [HCB9H9]-, and their derivatives have primarily been used as weakly coordinating anions to isolate reactive intermediates, platforms for stoichiometric and catalytic functionalization, counteranions for simple Lewis acid catalysis, and components of materials like liquid crystals. The aim of this article is to educate the reader on the contemporary nonclassical applications of these anions. Specifically, this review will cover new directions in main group catalysis utilized to achieve some of the most challenging catalytic reactions such as C-F, C-H, and C-C functionalizations that are difficult or impossible to realize with transition metals. In addition, the review will cover the utilization of the clusters as dianionic C σ-bound ligands for coordination chemistry, ligand substituents for coordination chemistry and advanced catalyst design, and covalently bound spectator substituents to stabilize radicals. Furthermore, their applications as solution-based and solid-state electrolytes for Li, Na, and Mg batteries will be discussed.
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Affiliation(s)
- S P Fisher
- Department of Chemistry , University of California, Riverside , 501 Big Springs Road , Riverside , California 92521 , United States
| | - A W Tomich
- Department of Chemistry , University of California, Riverside , 501 Big Springs Road , Riverside , California 92521 , United States
| | - S O Lovera
- Department of Chemistry , University of California, Riverside , 501 Big Springs Road , Riverside , California 92521 , United States
| | - J F Kleinsasser
- Department of Chemistry , University of California, Riverside , 501 Big Springs Road , Riverside , California 92521 , United States
| | - J Guo
- Department of Chemical and Environmental Engineering , University of California, Riverside , Riverside , California 92521 , United States
| | - M J Asay
- Department of Chemistry and Biochemistry , University of California , Los Angeles , California 90095 , United States
| | - H M Nelson
- Department of Chemistry and Biochemistry , University of California , Los Angeles , California 90095 , United States
| | - V Lavallo
- Department of Chemistry , University of California, Riverside , 501 Big Springs Road , Riverside , California 92521 , United States
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31
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Dziedzic RM, Spokoyny AM. Metal-catalyzed cross-coupling chemistry with polyhedral boranes. Chem Commun (Camb) 2019; 55:430-442. [PMID: 30525176 PMCID: PMC6491218 DOI: 10.1039/c8cc08693a] [Citation(s) in RCA: 84] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Over the past several decades, metal-catalyzed cross-coupling has emerged as a very powerful strategy to functionalize carbon-based molecules. More recently, some of the cross-coupling methodologies have been adapted to inorganic compounds including boron-rich clusters. The development of this chemistry relies on the ability to synthesize halogenated boron-rich clusters which can serve as electrophilic cross-coupling partners with nucleophilic substrates in the presence of a metal catalyst. While the cross-coupling chemistry with boron-clusters is conceptually reminiscent of that of its hydrocarbon counterparts, several key aspects including the spheroidal bulk of clusters and the distinct nature of boron-halogen/boron-heteroatom bonds make this chemistry unique. The utility of metal-catalyzed cross-coupling can be extended to several classes of polyhedral boranes including neutral and anionic carboranes, metallaboranes, and carbon-free boranes. Importantly, cross-coupling enables a suite of boron-heteroatom (C, N, O, P, S) couplings to prepare boron cluster-based systems that can be used for ligand design, medicinal chemistry, and materials applications.
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Affiliation(s)
- Rafal M Dziedzic
- Department of Chemistry & Biochemistry, University of California, Los Angeles, 607 Charles E. Young Drive East, Los Angeles, California 90095, USA.
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32
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Rodríguez-Rey JL, Esteban-Gómez D, Platas-Iglesias C, Sousa-Pedrares A. Electronic versus steric control in palladium complexes of carboranyl phosphine-iminophosphorane ligands. Dalton Trans 2019; 48:486-503. [PMID: 30520489 DOI: 10.1039/c8dt04006k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new family of carboranyl phosphine-iminophosphorane ligands was prepared and characterized. The new ligands present a carboranyl group directly attached to the iminophosphorane nitrogen atom through a cage carbon atom (C-carboranyl derivatives L1-L3) or through the B3 boron atom (B-carboranyl derivatives L4 and L5), and the phosphine group on a side chain derived from the diphosphine dppm, i.e. with a two-atom spacer between the P and N donor atoms. The non-carboranyl analogue L6, with a biphenyl group on the nitrogen atom, was also synthesized for comparison. These potential (P, N) ligands were used to obtain palladium complexes (Pd1-Pd6) and, thus, study how the different inductive effect of the carboranyl substituents can modify the coordinating ability of the nitrogen atom. The structural analysis of the complexes revealed two different coordination modes for the ligands: the (P, N) chelate coordination and the unexpected P-terminal coordination, which is not observed for non-carboranyl phosphine-iminophosphoranes. These unexpected structural differences led us to perform DFT calculations on the ligands and metal complexes. The calculations show that the final coordination modes depend on the balance between the electronic and steric properties of the particular carboranyl group.
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Affiliation(s)
- José Luis Rodríguez-Rey
- Departamento de Química Inorgánica, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain.
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33
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Gao Y, Guo ST, Cui PF, Aznarez F, Jin GX. Iridium-induced regioselective B–H and C–H activations at azo-substitutedm-carboranes: facile access to polynuclear complexes. Chem Commun (Camb) 2019; 55:210-213. [DOI: 10.1039/c8cc09084j] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Iridium-induced selective C–H and B(2,3)–H bond activations have been achieved atm-carboranes featuring azobenzene directing groups. A series of mononuclear, dinuclear and trinuclear complexes have been obtained.
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Affiliation(s)
- Yang Gao
- State Key Laboratory of Molecular Engineering of Polymers
- Collaborative Innovation Center of Chemistry for Energy Materials
- Department of Chemistry
- Fudan University
- Shanghai 200433
| | - Shu-Ting Guo
- State Key Laboratory of Molecular Engineering of Polymers
- Collaborative Innovation Center of Chemistry for Energy Materials
- Department of Chemistry
- Fudan University
- Shanghai 200433
| | - Peng-Fei Cui
- State Key Laboratory of Molecular Engineering of Polymers
- Collaborative Innovation Center of Chemistry for Energy Materials
- Department of Chemistry
- Fudan University
- Shanghai 200433
| | - Francisco Aznarez
- State Key Laboratory of Molecular Engineering of Polymers
- Collaborative Innovation Center of Chemistry for Energy Materials
- Department of Chemistry
- Fudan University
- Shanghai 200433
| | - Guo-Xin Jin
- State Key Laboratory of Molecular Engineering of Polymers
- Collaborative Innovation Center of Chemistry for Energy Materials
- Department of Chemistry
- Fudan University
- Shanghai 200433
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34
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Messina MS, Graefe CT, Chong P, Ebrahim OM, Pathuri RS, Bernier NA, Mills HA, Rheingold AL, Frontiera RR, Maynard HD, Spokoyny AM. Carborane RAFT agents as tunable and functional molecular probes for polymer materials. Polym Chem 2019. [DOI: 10.1039/c9py00199a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Carborane RAFT agents are introduced as tunable multi-purpose tools acting as 1H NMR spectroscopic handles, Raman probes, and recognition units.
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Affiliation(s)
- Marco S. Messina
- Department of Chemistry and Biochemistry
- University of California
- Los Angeles
- USA
| | | | - Paul Chong
- Department of Chemistry and Biochemistry
- University of California
- Los Angeles
- USA
- Department of Chemistry
| | - Omar M. Ebrahim
- Department of Chemistry and Biochemistry
- University of California
- Los Angeles
- USA
| | - Ramya S. Pathuri
- Department of Chemistry and Biochemistry
- University of California
- Los Angeles
- USA
| | - Nicholas A. Bernier
- Department of Chemistry and Biochemistry
- University of California
- Los Angeles
- USA
| | - Harrison A. Mills
- Department of Chemistry and Biochemistry
- University of California
- Los Angeles
- USA
| | | | | | - Heather D. Maynard
- Department of Chemistry and Biochemistry
- University of California
- Los Angeles
- USA
- California NanoSystems Institute
| | - Alexander M. Spokoyny
- Department of Chemistry and Biochemistry
- University of California
- Los Angeles
- USA
- California NanoSystems Institute
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35
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Kleinsasser JF, Reinhart ED, Estrada J, Jordan RF, Lavallo V. Ethylene Oligomerization and Polymerization by Palladium(II) Methyl Complexes Supported by Phosphines Bearing a Perchlorinated 10-Vertex closo-Carborane Anion Substituent. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00772] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Jack F. Kleinsasser
- Department of Chemistry, University of California, Riverside, California 92521, United States
| | - Erik D. Reinhart
- Department of Chemistry, The University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637, United States
| | - Jess Estrada
- Department of Chemistry, University of California, Riverside, California 92521, United States
| | - Richard F. Jordan
- Department of Chemistry, The University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637, United States
| | - Vincent Lavallo
- Department of Chemistry, University of California, Riverside, California 92521, United States
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36
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Exploiting the Electronic Tuneability of Carboranes as Supports for Frustrated Lewis Pairs. Molecules 2018; 23:molecules23123099. [PMID: 30486434 PMCID: PMC6321043 DOI: 10.3390/molecules23123099] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Revised: 11/22/2018] [Accepted: 11/23/2018] [Indexed: 11/16/2022] Open
Abstract
The first example of a carborane with a catecholborolyl substituent, [1-Bcat-2-Ph-closo-1,2-C₂B10H10] (1), has been prepared and characterized and shown to act as the Lewis acid component of an intermolecular frustrated Lewis pair in catalyzing a Michael addition. In combination with B(C₆F₅)₃ the C-carboranylphosphine [1-PPh₂-closo-1,2-C₂B10H11] (IVa) is found to be comparable with PPh₂(C₆F₅) in its ability to catalyze hydrosilylation, whilst the more strongly basic B-carboranylphosphine [9-PPh₂-closo-1,7-C₂B10H11] (V) is less effective and the very weakly basic species [μ-2,2'-PPh-{1-(1'-1',2'-closo-C₂B10H10)-1,2-closo-C₂B10H10}] (IX) is completely ineffective. Base strengths are rank-ordered via measurement of the ¹J 31P-77Se coupling constants of the phosphineselenides [1-SePPh₂-closo-1,2-C₂B10H11] (2), [9-SePPh₂-closo-1,7-C₂B10H11] (3), and [SePPh₂(C₆F₅)] (4).
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37
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Kirlikovali KO, Axtell JC, Anderson K, Djurovich PI, Rheingold AL, Spokoyny AM. Fine-Tuning Electronic Properties of Luminescent Pt(II) Complexes via Vertex-Differentiated Coordination of Sterically Invariant Carborane-Based Ligands. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00475] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
| | | | | | - Peter I. Djurovich
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States
| | - Arnold L. Rheingold
- Department of Chemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
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39
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Marsh AV, Cheetham NJ, Little M, Dyson M, White AJP, Beavis P, Warriner CN, Swain AC, Stavrinou PN, Heeney M. Carborane‐Induced Excimer Emission of Severely Twisted Bis‐
o
‐Carboranyl Chrysene. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201805967] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Adam V. Marsh
- Department of Chemistry and Centre for Plastic ElectronicsImperial College London London SW7 2AZ UK
| | - Nathan J. Cheetham
- Department of Physics and Centre for Plastics ElectronicsImperial College London UK
| | - Mark Little
- Department of Chemistry and Centre for Plastic ElectronicsImperial College London London SW7 2AZ UK
| | - Matthew Dyson
- Molecular Materials and Nanosystems and Institute for Complex Molecular SystemsEindhoven University of Technology 5600 MB Eindhoven The Netherlands
| | | | | | | | | | - Paul N. Stavrinou
- Department of Engineering ScienceUniversity of Oxford Oxford OX1 3PJ UK
| | - Martin Heeney
- Department of Chemistry and Centre for Plastic ElectronicsImperial College London London SW7 2AZ UK
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40
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Marsh AV, Cheetham NJ, Little M, Dyson M, White AJP, Beavis P, Warriner CN, Swain AC, Stavrinou PN, Heeney M. Carborane-Induced Excimer Emission of Severely Twisted Bis-o-Carboranyl Chrysene. Angew Chem Int Ed Engl 2018; 57:10640-10645. [PMID: 29952051 PMCID: PMC6099267 DOI: 10.1002/anie.201805967] [Citation(s) in RCA: 64] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Indexed: 12/01/2022]
Abstract
The synthesis of a highly twisted chrysene derivative incorporating two electron deficient o-carboranyl groups is reported. The molecule exhibits a complex, excitation-dependent photoluminescence, including aggregation-induced emission (AIE) with good quantum efficiency and an exceptionally long singlet excited state lifetime. Through a combination of detailed optical studies and theoretical calculations, the excited state species are identified, including an unusual excimer induced by the presence of o-carborane. This is the first time that o-carborane has been shown to induce excimer formation ab initio, as well as the first observation of excimer emission by a chrysene-based small molecule in solution. Bis-o-carboranyl chrysene is thus an initial member of a new family of o-carboranyl phenacenes exhibiting a novel architecture for highly-efficient multi-luminescent fluorophores.
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Affiliation(s)
- Adam V. Marsh
- Department of Chemistry and Centre for Plastic ElectronicsImperial College LondonLondonSW7 2AZUK
| | - Nathan J. Cheetham
- Department of Physics and Centre for Plastics ElectronicsImperial College LondonUK
| | - Mark Little
- Department of Chemistry and Centre for Plastic ElectronicsImperial College LondonLondonSW7 2AZUK
| | - Matthew Dyson
- Molecular Materials and Nanosystems and Institute for Complex Molecular SystemsEindhoven University of Technology5600 MBEindhovenThe Netherlands
| | | | | | | | | | - Paul N. Stavrinou
- Department of Engineering ScienceUniversity of OxfordOxfordOX1 3PJUK
| | - Martin Heeney
- Department of Chemistry and Centre for Plastic ElectronicsImperial College LondonLondonSW7 2AZUK
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41
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Gao Y, Cui PF, Aznarez F, Jin GX. Iridium-Induced Regioselective B−H and C−C Activations at Azo-Substitutedo-Carboranes. Chemistry 2018; 24:10357-10363. [DOI: 10.1002/chem.201801381] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Revised: 05/03/2018] [Indexed: 01/15/2023]
Affiliation(s)
- Yang Gao
- State Key Laboratory of Molecular Engineering of Polymers, Collaborative Innovation Center of Chemistry for Energy Materials, Department of Chemistry; Fudan University; Shanghai 200433 P.R. China
| | - Peng-Fei Cui
- State Key Laboratory of Molecular Engineering of Polymers, Collaborative Innovation Center of Chemistry for Energy Materials, Department of Chemistry; Fudan University; Shanghai 200433 P.R. China
| | - Francisco Aznarez
- State Key Laboratory of Molecular Engineering of Polymers, Collaborative Innovation Center of Chemistry for Energy Materials, Department of Chemistry; Fudan University; Shanghai 200433 P.R. China
| | - Guo-Xin Jin
- State Key Laboratory of Molecular Engineering of Polymers, Collaborative Innovation Center of Chemistry for Energy Materials, Department of Chemistry; Fudan University; Shanghai 200433 P.R. China
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42
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Sterically encumbered dianionic dicarboranyl pincer ligand (C5H3N)(C2B10H11)2 and its CNC Nickel(II) complex. J Organomet Chem 2018. [DOI: 10.1016/j.jorganchem.2017.11.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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43
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Eleazer BJ, Peryshkov DV. Coordination Chemistry of Carborane Clusters: Metal-Boron Bonds in Carborane, Carboranyl, and Carboryne Complexes. COMMENT INORG CHEM 2018. [DOI: 10.1080/02603594.2018.1465939] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Bennett J. Eleazer
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina, USA
| | - Dmitry V. Peryshkov
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina, USA
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44
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Nishino K, Uemura K, Tanaka K, Morisaki Y, Chujo Y. Modulation of the cis
- and trans
-Conformations in Bis-o
-carborane Substituted Benzodithiophenes and Emission Enhancement Effect on Luminescent Efficiency by Solidification. European J Org Chem 2018. [DOI: 10.1002/ejoc.201701641] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Kenta Nishino
- Department of Polymer Chemistry; Graduate School of Engineering; Kyoto University; Katsura, Nishikyo-ku 8510 Kyoto 615- Japan
| | - Kyoya Uemura
- Department of Polymer Chemistry; Graduate School of Engineering; Kyoto University; Katsura, Nishikyo-ku 8510 Kyoto 615- Japan
| | - Kazuo Tanaka
- Department of Polymer Chemistry; Graduate School of Engineering; Kyoto University; Katsura, Nishikyo-ku 8510 Kyoto 615- Japan
| | - Yasuhiro Morisaki
- Department of Polymer Chemistry; Graduate School of Engineering; Kyoto University; Katsura, Nishikyo-ku 8510 Kyoto 615- Japan
| | - Yoshiki Chujo
- Department of Polymer Chemistry; Graduate School of Engineering; Kyoto University; Katsura, Nishikyo-ku 8510 Kyoto 615- Japan
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45
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Synthesis and redox properties of fac-BrRe(CO)3[1,2-(PPh2)2-closo-1,2-C2B10H10]: The first structurally characterized rhenium carbonyl containing a carboranyl-based diphosphine ligand. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2017.11.071] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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46
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Dopke JA, Lincoln ZS, Blazejewski J, Staples RJ, Lee ME. Microwave synthesis of charge-compensated dodecaborates bearing exohedral boron-phosphorus connectivities. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2017.12.027] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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47
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Wang Z, Wang T, Zhang C, Humphrey MG. N‐Donor/Fluorenyl
o
‐Carborane Fluorophores with Strong Crystallization‐Induced Emission. CHEMPHOTOCHEM 2018. [DOI: 10.1002/cptc.201700199] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Zhaojin Wang
- School of Chemical and Material Engineering Jiangnan University Wuxi 214122 Jiangsu Province P.R. China
| | - Tianyu Wang
- School of Chemical and Material Engineering Jiangnan University Wuxi 214122 Jiangsu Province P.R. China
| | - Chi Zhang
- School of Chemical and Material Engineering Jiangnan University Wuxi 214122 Jiangsu Province P.R. China
| | - Mark G. Humphrey
- School of Chemical and Material Engineering Jiangnan University Wuxi 214122 Jiangsu Province P.R. China
- Research School of Chemistry Australian National University Canberra ACT 2601 Australia
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48
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Frutos M, Gómez-Gallego M, Giner EA, Sierra MA, Ramírez de Arellano C. Triazole vs. triazolium carbene ligands in the site-selective cyclometallation of o-carboranes by M(iii) (M = Ir, Rh) complexes. Dalton Trans 2018; 47:9975-9979. [DOI: 10.1039/c8dt02296h] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
M(iii)-mediated (M = Ir, Rh) site-selective cage B–H and C–H bond activation in o-carboranylmethyl derivatives has been achieved by switching the electron donating properties of the 1,2,3-triazole ligand.
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Affiliation(s)
- María Frutos
- Departamento de Química Orgánica
- Facultad de Química and Centro de Innovación en Química Avanzada (ORFEO-CINQA)
- Universidad Complutense
- 28040 Madrid
- Spain
| | - Mar Gómez-Gallego
- Departamento de Química Orgánica
- Facultad de Química and Centro de Innovación en Química Avanzada (ORFEO-CINQA)
- Universidad Complutense
- 28040 Madrid
- Spain
| | - Elena A. Giner
- Departamento de Química Orgánica
- Facultad de Química and Centro de Innovación en Química Avanzada (ORFEO-CINQA)
- Universidad Complutense
- 28040 Madrid
- Spain
| | - Miguel A. Sierra
- Departamento de Química Orgánica
- Facultad de Química and Centro de Innovación en Química Avanzada (ORFEO-CINQA)
- Universidad Complutense
- 28040 Madrid
- Spain
| | - Carmen Ramírez de Arellano
- Departamento de Química Orgánica Facultad de Química and Centro de Innovación en Química Avanzada (ORFEO-CINQA)
- Universidad de Valencia
- 46100-Valencia
- Spain
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49
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Crujeiras P, Rodríguez-Rey JL, Sousa-Pedrares A. Coordinating Ability of the Iminophosphorane Group in ortho
-Carborane Derivatives. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700487] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Pablo Crujeiras
- Departamento de Química Inorgánica; Facultad de Química; Universidade de Santiago de Compostela; 15782 Santiago de Compostela Spain
| | - José Luis Rodríguez-Rey
- Departamento de Química Inorgánica; Facultad de Química; Universidade de Santiago de Compostela; 15782 Santiago de Compostela Spain
| | - Antonio Sousa-Pedrares
- Departamento de Química Inorgánica; Facultad de Química; Universidade de Santiago de Compostela; 15782 Santiago de Compostela Spain
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50
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Axtell JC, Kirlikovali KO, Dziedzic RM, Gembicky M, Rheingold AL, Spokoyny AM. Magnesium Reagents Featuring a 1,1′‐Bis(
o
‐carborane) Ligand Platform. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700604] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Jonathan C. Axtell
- Department of Chemistry and Biochemistry University of California, Los Angeles 90095 Los Angeles California USA
| | - Kent O. Kirlikovali
- Department of Chemistry and Biochemistry University of California, Los Angeles 90095 Los Angeles California USA
| | - Rafal M. Dziedzic
- Department of Chemistry and Biochemistry University of California, Los Angeles 90095 Los Angeles California USA
| | - Milan Gembicky
- Department of Chemistry and Biochemistry University of California, San Diego 92093 San Diego California USA
| | - Arnold L. Rheingold
- Department of Chemistry and Biochemistry University of California, San Diego 92093 San Diego California USA
| | - Alexander M. Spokoyny
- Department of Chemistry and Biochemistry University of California, Los Angeles 90095 Los Angeles California USA
- California NanoSystems Institute University of California, Los Angeles 90095 Los Angeles California USA
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