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Straiton A, McMullin CL, Kociok- Köhn G, Lyall CL, Parish JD, Johnson AL. Lithium, Tin(II), and Zinc Amino-Boryloxy Complexes: Synthesis and Characterization. Inorg Chem 2023; 62:2576-2591. [PMID: 36708353 PMCID: PMC9930121 DOI: 10.1021/acs.inorgchem.2c03108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Indexed: 01/29/2023]
Abstract
Analogous to the ubiquitous alkoxide ligand, metal boroxide and boryloxy complexes are an underexplored class of hard anionic O- ligand. A new series of amine-stabilized Li, Sn(II), and Zn boryloxy complexes, comprising electron-rich tetrahedral boron centers have been synthesized and characterized. All complexes have been characterized by one-dimensional (1D), two-dimensional (2D), and DOSY NMR, which are consistent with the solid-state structures unambiguously determined via single-crystal X-ray diffraction. Electron-rich μ2- (Sn and Zn) and μ3- (Li) boryloxy binding modes are observed. Compounds 6-9 are the first complexes of this class, with the chelating bis- and tris-phenol ligands providing a scaffold that can be easily functionalized and provides access to the boronic acid pro-ligand, hence allowing facile direct synthesis of the resulting compounds. Computational quantum chemical studies suggest a significant enhancement of the π-donor ability of the amine-stabilized boryloxy ligand because of electron donation from the amine functionality into the p-orbital of the boron atom.
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Affiliation(s)
- Andrew
J. Straiton
- Department
of Chemistry, University of Bath, Claverton Down BA2 7AY, U.K.
| | - Claire L. McMullin
- Department
of Chemistry, University of Bath, Claverton Down BA2 7AY, U.K.
| | - Gabriele Kociok- Köhn
- Material
and Chemical Characterisation Facility, University of Bath, Claverton
Down BA2 7AY, U.K.
| | - Catherine L. Lyall
- Material
and Chemical Characterisation Facility, University of Bath, Claverton
Down BA2 7AY, U.K.
| | - James D. Parish
- Infineum
UK Ltd., Milton Hill Business and Technology Centre, Abingdon OX13 6BB, Oxfordshire, U.K.
| | - Andrew L. Johnson
- Department
of Chemistry, University of Bath, Claverton Down BA2 7AY, U.K.
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2
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Chakraborty B, Rajput A, Soni M. Electroreduction: A sustainable and less energy‐intensive approach compared to chemical reduction for phosphine oxide recycling to phosphine. ChemElectroChem 2022. [DOI: 10.1002/celc.202101658] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Biswarup Chakraborty
- Indian Institute of Technology Delhi Department of Chemistry Hauz Khas 110016 New Delhi INDIA
| | - Anubha Rajput
- IIT Delhi: Indian Institute of Technology Delhi Department of Chemistry Hauz Khas 110016 INDIA
| | - Monika Soni
- IIT Delhi: Indian Institute of Technology Delhi Department of Chemistry Hauz Khas 110016 Delhi INDIA
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3
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4
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Beagan DM, Cabelof AC, Pink M, Carta V, Gao X, Caulton KG. Nickel-mediated N-N bond formation and N 2O liberation via nitrogen oxyanion reduction. Chem Sci 2021; 12:10664-10672. [PMID: 34447560 PMCID: PMC8356809 DOI: 10.1039/d1sc02846d] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Accepted: 07/13/2021] [Indexed: 12/26/2022] Open
Abstract
The syntheses of (DIM)Ni(NO3)2 and (DIM)Ni(NO2)2, where DIM is a 1,4-diazadiene bidentate donor, are reported to enable testing of bis boryl reduced N-heterocycles for their ability to carry out stepwise deoxygenation of coordinated nitrate and nitrite, forming O(Bpin)2. Single deoxygenation of (DIM)Ni(NO2)2 yields the tetrahedral complex (DIM)Ni(NO)(ONO), with a linear nitrosyl and κ1-ONO. Further deoxygenation of (DIM)Ni(NO)(ONO) results in the formation of dimeric [(DIM)Ni(NO)]2, where the dimer is linked through a Ni–Ni bond. The lost reduced nitrogen byproduct is shown to be N2O, indicating N–N bond formation in the course of the reaction. Isotopic labelling studies establish that the N–N bond of N2O is formed in a bimetallic Ni2 intermediate and that the two nitrogen atoms of (DIM)Ni(NO)(ONO) become symmetry equivalent prior to N–N bond formation. The [(DIM)Ni(NO)]2 dimer is susceptible to oxidation by AgX (X = NO3−, NO2−, and OTf−) as well as nitric oxide, the latter of which undergoes nitric oxide disproportionation to yield N2O and (DIM)Ni(NO)(ONO). We show that the first step in the deoxygenation of (DIM)Ni(NO)(ONO) to liberate N2O is outer sphere electron transfer, providing insight into the organic reductants employed for deoxygenation. Lastly, we show that at elevated temperatures, deoxygenation is accompanied by loss of DIM to form either pyrazine or bipyridine bridged polymers, with retention of a BpinO− bridging ligand. Deoxygenation of nitrogen oxyanions coordinated to nickel using reduced borylated heterocycles leads to N–N bond formation and N2O liberation. The nickel dimer product facilitates NO disproportionation, leading to a synthetic cycle.![]()
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Affiliation(s)
- Daniel M Beagan
- Indiana University, Department of Chemistry 800 E. Kirkwood Ave. Bloomington IN 47401 USA
| | - Alyssa C Cabelof
- Indiana University, Department of Chemistry 800 E. Kirkwood Ave. Bloomington IN 47401 USA
| | - Maren Pink
- Indiana University, Department of Chemistry 800 E. Kirkwood Ave. Bloomington IN 47401 USA
| | - Veronica Carta
- Indiana University, Department of Chemistry 800 E. Kirkwood Ave. Bloomington IN 47401 USA
| | - Xinfeng Gao
- Indiana University, Department of Chemistry 800 E. Kirkwood Ave. Bloomington IN 47401 USA
| | - Kenneth G Caulton
- Indiana University, Department of Chemistry 800 E. Kirkwood Ave. Bloomington IN 47401 USA
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5
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Sahoo RK, Sarkar N, Nembenna S. Zinc Hydride Catalyzed Chemoselective Hydroboration of Isocyanates: Amide Bond Formation and C=O Bond Cleavage. Angew Chem Int Ed Engl 2021; 60:11991-12000. [PMID: 33638314 DOI: 10.1002/anie.202100375] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2021] [Revised: 02/16/2021] [Indexed: 12/15/2022]
Abstract
Herein, a remarkable conjugated bis-guanidinate (CBG) supported zinc hydride, [{LZnH}2 ; L={(ArHN)(ArN)-C=N-C=(NAr)(NHAr); Ar=2,6-Et2 -C6 H3 }] (I) catalyzed partial reduction of heteroallenes via hydroboration is reported. A large number of aryl and alkyl isocyanates, including electron-donating and withdrawing groups, undergo reduction to obtain selectively N-boryl formamide, bis(boryl) hemiaminal and N-boryl methyl amine products. The compound I effectively catalyzes the chemoselective reduction of various isocyanates, in which the construction of the amide bond occurs. Isocyanates undergo a deoxygenation hydroboration reaction, in which the C=O bond cleaves, leading to N-boryl methyl amines. Several functionalities such as nitro, cyano, halide, and alkene groups are well-tolerated. Furthermore, a series of kinetic, control experiments and structurally characterized intermediates suggest that the zinc hydride species are responsible for all reduction steps and breaking the C=O bond.
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Affiliation(s)
- Rajata Kumar Sahoo
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar, 752050, India
| | - Nabin Sarkar
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar, 752050, India
| | - Sharanappa Nembenna
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar, 752050, India
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6
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Zinc Hydride Catalyzed Chemoselective Hydroboration of Isocyanates: Amide Bond Formation and C=O Bond Cleavage. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202100375] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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7
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Sowa S, Pietrusiewicz KM. Reduction of tertiary phosphine oxides to phosphine-boranes using Ti(Oi-Pr)4/BH3-THF. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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8
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Nishihara Y, Nishide Y, Osakada K. Synthesis and reactivity of boryloxorhodium complexes. Relevance to intermolecular transmetalation from boron to rhodium in Rh-catalyzed reactions. Dalton Trans 2021; 50:3610-3615. [PMID: 33624681 DOI: 10.1039/d1dt00440a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The synthesis of a dimeric boryloxorhodium complex having the Rh-O-Bpin scaffold from the reaction of [(cod)Rh(OMe)]2 or [(cod)Rh(OH)]2 with an arylboronate has been achieved. The obtained dirhodium complex is converted into mononuclear complex [(cod)Rh(OBpin)(PPh3)], which reacts with arylboronic acid to afford the complex with an Rh-aryl bond via transmetalation from boron to rhodium. The dimeric boryloxorhodium complex catalyzes the 1,4-addition of arylboronic acid to cyclohexene-2-one.
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Affiliation(s)
- Yasushi Nishihara
- Laboratory for Chemistry and Life Science, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama 226-8503, Japan.
| | - Yasuhiro Nishide
- Laboratory for Chemistry and Life Science, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama 226-8503, Japan.
| | - Kohtaro Osakada
- Laboratory for Chemistry and Life Science, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama 226-8503, Japan.
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9
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Weitkamp RF, Neumann B, Stammler H, Hoge B. The Influence of Weakly Coordinating Cations on the O-H⋅⋅⋅O - Hydrogen Bond of Silanol-Silanolate Anions. Chemistry 2021; 27:915-920. [PMID: 33180359 PMCID: PMC7839788 DOI: 10.1002/chem.202004236] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Revised: 11/06/2020] [Indexed: 11/21/2022]
Abstract
The reaction of a saline phosphazenium hydroxide hydrate with siloxanes led to a novel kind of silanol-silanolate anions. The weakly coordinating behavior of the cation renders the formation of silanol-silanolate hydrogen bonds possible, which otherwise suffer from detrimental silanolate-oxygen cation interactions. We investigated the influence of various weakly coordinating cations on silanol-silanolate motifs, particularly with regard to different cation sizes. While large cations favor the formation of intramolecular hydrogen bonds resulting in cyclic structures, the less bulky tetramethyl ammonium cation encourages the formation of polyanionic silanol-silanolate chains in the solid state.
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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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10
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Pang Y, Leutzsch M, Nöthling N, Cornella J. Catalytic Activation of N 2O at a Low-Valent Bismuth Redox Platform. J Am Chem Soc 2020; 142:19473-19479. [PMID: 33146996 PMCID: PMC7677929 DOI: 10.1021/jacs.0c10092] [Citation(s) in RCA: 65] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
![]()
Herein
we present the catalytic activation of N2O at
a BiI⇄BiIII redox platform. The activation
of such a kinetically inert molecule was achieved by the use of bismuthinidene
catalysts, aided by HBpin as reducing agent. The protocol features
remarkably mild conditions (25 °C, 1 bar N2O), together
with high turnover numbers (TON, up to 6700) and turnover frequencies
(TOF). Analysis of the elementary steps enabled structural characterization
of catalytically relevant intermediates after O-insertion, namely
a rare arylbismuth oxo dimer and a unique monomeric arylbismuth hydroxide.
This protocol represents a distinctive example of a main-group redox
cycling for the catalytic activation of N2O.
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Affiliation(s)
- Yue Pang
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr, 45470, Germany
| | - Markus Leutzsch
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr, 45470, Germany
| | - Nils Nöthling
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr, 45470, Germany
| | - Josep Cornella
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr, 45470, Germany
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11
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Barger CJ, Dicken RD, Weidner VL, Motta A, Lohr TL, Marks TJ. La[N(SiMe3)2]3-Catalyzed Deoxygenative Reduction of Amides with Pinacolborane. Scope and Mechanism. J Am Chem Soc 2020; 142:8019-8028. [DOI: 10.1021/jacs.0c02446] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Christopher J. Barger
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Rachel D. Dicken
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Victoria L. Weidner
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Alessandro Motta
- Dipartimento di Scienze Chimiche, Università di Roma “La Sapienza” and INSTM, UdR Roma, Piazzale Aldo Moro 5, Roma I-00185, Italy
| | - Tracy L. Lohr
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Tobin J. Marks
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
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12
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Provis-Evans CB, Emanuelsson EAC, Webster RL. Rapid Metal-Free Formation of Free Phosphines from Phosphine Oxides. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201800723] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Cei B. Provis-Evans
- Department of Chemistry; University of Bath, Bath; UK, BA2 7AY
- Centre for Sustainable Chemical Technologies; University of Bath, Bath; UK, BA2 7AY
| | | | - Ruth L. Webster
- Department of Chemistry; University of Bath, Bath; UK, BA2 7AY
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13
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Cowie BE, Nichol GS, Love JB, Arnold PL. Double uranium oxo cations derived from uranyl by borane or silane reduction. Chem Commun (Camb) 2018; 54:3839-3842. [PMID: 29589007 PMCID: PMC5932998 DOI: 10.1039/c8cc00341f] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new type of double uranium oxo cation [O-U-O-U-O]4+ is prepared by selective oxygen-atom abstraction from macrocyclic uranyl complexes using either boranes or silanes. A significant degree of multiple U[double bond, length as m-dash]O bonding is evident throughout the U2O3 core, but either trans-,cis- or trans-,trans-OUOUO motifs can be isolated as boron- or silicon-capped oxo complexes. Further controlled deoxygenation of the borylated system is also possible.
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Affiliation(s)
- Bradley E Cowie
- EaStCHEM School of Chemistry, The University of Edinburgh, Joseph Black Building, The King's Buildings, Edinburgh, EH9 3FJ, UK.
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14
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Yang Y, Anker MD, Fang J, Mahon MF, Maron L, Weetman C, Hill MS. Hydrodeoxygenation of isocyanates: snapshots of a magnesium-mediated C[double bond, length as m-dash]O bond cleavage. Chem Sci 2017; 8:3529-3537. [PMID: 30155199 PMCID: PMC6092714 DOI: 10.1039/c7sc00117g] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Accepted: 02/28/2017] [Indexed: 11/24/2022] Open
Abstract
Organic isocyanates are readily converted to methyl amine products through their hydroboration with HBpin in the presence of a β-diketiminato magnesium catalyst. Although borylated amide and N-,O-bis(boryl)hemiaminal species have been identified as intermediates during the reductive catalysis, the overall reduction and C-O activation is metal-mediated and proposed to occur through the further intermediacy of well-defined magnesium formamidato, formamidatoborate and magnesium boryloxide derivatives. Examples of all these species have been identified and fully characterised through stoichiometric reactivity studies and the stability of the borate species leads us to suggest that, under catalytic conditions, the onward progress of the deoxygenation reaction is crucially dependent on the further activation provided by the Lewis acidic HBpin substrate. These deductions have been explored and ratified through a DFT study.
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Affiliation(s)
- Yan Yang
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province , School of Chemistry and Chemical Engineering , Lanzhou University , Lanzhou 730000 , PR China .
| | - Mathew D Anker
- Department of Chemistry , University of Bath , Bath BA2 7AY , UK .
| | - Jian Fang
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province , School of Chemistry and Chemical Engineering , Lanzhou University , Lanzhou 730000 , PR China .
| | - Mary F Mahon
- Department of Chemistry , University of Bath , Bath BA2 7AY , UK .
| | - Laurent Maron
- LPCNO , Université de Toulouse , INSA Toulouse 135 , Avenue de Rangueil , 31077 Toulouse cedex , France
| | | | - Michael S Hill
- Department of Chemistry , University of Bath , Bath BA2 7AY , UK .
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15
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St-Coeur PD, Kinley S, Vogels CM, Decken A, Jr. Morin P, Westcott SA. Synthesis, characterization, and anticancer properties of iminophosphineplatinum(II) complexes containing boronate esters. CAN J CHEM 2017. [DOI: 10.1139/cjc-2016-0570] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Three new iminophosphines containing pinacol-derived boronate esters have been prepared and ligated to dichloridoplatinum(II) fragments. All compounds have been characterized fully, including an X-ray diffraction study carried out for the platinum complex 8, which is derived from 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)aniline. These three new platinum complexes, along with the non-boron containing control, have been examined for their initial cytotoxic properties against two glioma cell lines using the MTT method.
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Affiliation(s)
- Patrick-Denis St-Coeur
- Département de chimie et biochimie, Université de Moncton, Campus de Moncton, Moncton, NB E1A 3E9, Canada
| | - Samantha Kinley
- Department of Chemistry and Biochemistry, Mount Allison University, Sackville, NB E4L 1G8, Canada
| | - Christopher M. Vogels
- Department of Chemistry and Biochemistry, Mount Allison University, Sackville, NB E4L 1G8, Canada
| | - Andreas Decken
- Department of Chemistry, University of New Brunswick, Fredericton, NB E3B 5A3, Canada
| | - Pier Jr. Morin
- Département de chimie et biochimie, Université de Moncton, Campus de Moncton, Moncton, NB E1A 3E9, Canada
| | - Stephen A. Westcott
- Department of Chemistry and Biochemistry, Mount Allison University, Sackville, NB E4L 1G8, Canada
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16
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Shynkaruk O, Qi Y, Cottrell-Callbeck A, Torres Delgado W, McDonald R, Ferguson MJ, He G, Rivard E. Modular Synthesis of Diarylalkynes and Their Efficient Conversion into Luminescent Tetraarylbutadienes. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00298] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Olena Shynkaruk
- Department
of Chemistry, University of Alberta, 11227 Saskatchewan Drive, Edmonton, Alberta, Canada T6G 2G2
| | - Yanyu Qi
- Frontier
Institute of Science and Technology, Xi’an Jiaotong University, Xi’an, Shaanxi Province 710054, People’s Republic of China
| | - Aiden Cottrell-Callbeck
- Department
of Chemistry, University of Alberta, 11227 Saskatchewan Drive, Edmonton, Alberta, Canada T6G 2G2
| | - William Torres Delgado
- Department
of Chemistry, University of Alberta, 11227 Saskatchewan Drive, Edmonton, Alberta, Canada T6G 2G2
| | - Robert McDonald
- Department
of Chemistry, University of Alberta, 11227 Saskatchewan Drive, Edmonton, Alberta, Canada T6G 2G2
| | - Michael J. Ferguson
- Department
of Chemistry, University of Alberta, 11227 Saskatchewan Drive, Edmonton, Alberta, Canada T6G 2G2
| | - Gang He
- Frontier
Institute of Science and Technology, Xi’an Jiaotong University, Xi’an, Shaanxi Province 710054, People’s Republic of China
| | - Eric Rivard
- Department
of Chemistry, University of Alberta, 11227 Saskatchewan Drive, Edmonton, Alberta, Canada T6G 2G2
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17
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Torres Delgado W, Shahin F, Ferguson MJ, McDonald R, He G, Rivard E. Selective Placement of Bromide and Pinacolboronate Groups about a Tellurophene: New Building Blocks for Optoelectronic Applications. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00362] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- William Torres Delgado
- Department
of Chemistry, University of Alberta, 11227 Saskatchewan Drive, Edmonton, Alberta, Canada, T6G 2G2
| | - Fatemeh Shahin
- Department
of Chemistry, University of Alberta, 11227 Saskatchewan Drive, Edmonton, Alberta, Canada, T6G 2G2
| | - Michael J. Ferguson
- Department
of Chemistry, University of Alberta, 11227 Saskatchewan Drive, Edmonton, Alberta, Canada, T6G 2G2
| | - Robert McDonald
- Department
of Chemistry, University of Alberta, 11227 Saskatchewan Drive, Edmonton, Alberta, Canada, T6G 2G2
| | - Gang He
- Center
for Materials Chemistry, Frontier Institute of Science and Technology, Xi’an Jiaotong University, Xi’an, Shaanxi 710054, People’s Republic of China
| | - Eric Rivard
- Department
of Chemistry, University of Alberta, 11227 Saskatchewan Drive, Edmonton, Alberta, Canada, T6G 2G2
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18
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BOWES EG, VOGELS CM, DECKEN A, WESTCOTT SA. Synthesis and Molecular Structure of Ph<sub>3</sub>GeBO<sub>2</sub>C<sub>2</sub>Me<sub>4</sub>. X-RAY STRUCTURE ANALYSIS ONLINE 2016. [DOI: 10.2116/xraystruct.32.35] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Eric G. BOWES
- Department of Chemistry and Biochemistry, Mount Allison University
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19
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Jean S, Cormier K, Patterson AE, Vogels CM, Decken A, Robichaud GA, Turcotte S, Westcott SA. Synthesis, characterization, and anticancer properties of organometallic Schiff base platinum complexes. CAN J CHEM 2015. [DOI: 10.1139/cjc-2015-0157] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A small family of organometallic platinum complexes containing a chloride, cis-cyclooctene, and a Schiff base ligand have been prepared and characterized fully. Three aliphatic amines and four aromatic amines were chosen as representative examples. All complexes were stable in air except for 7, derived from the pinacol-protected 4-aminophenylboronate ester 4-H2NC6H4Bpin (pin = 1,2-O2C2Me4), which decomposed via B–C bond cleavage. Both complexes 4 (derived from aniline) and 7 were further characterized by single-crystal X-ray diffraction studies and confirmed the square planar nature of the platinum centre whereby the chloride ligand lies trans to the deprotonated hydroxyl group of the Schiff base ligand. The imine functionality is trans to the organic cyclooctene group. Complex 3, which contained the longest aliphatic chain studied (an octyl group), was the most promising for inducing apoptosis in the malignant MB231 breast cancer cell line. Conversely, complexes 4–6, which contained aromatic groups, were the most active against renal cell carcinoma (RCC) cell lines.
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Affiliation(s)
- Stéphanie Jean
- Département de chimie et biochimie, Université de Moncton, Campus de Moncton, Moncton, NB E1A 3E9, Canada
- Atlantic Cancer Research Institute, Moncton, NB E1C 8X3, Canada
| | - Kevin Cormier
- Département de chimie et biochimie, Université de Moncton, Campus de Moncton, Moncton, NB E1A 3E9, Canada
- Atlantic Cancer Research Institute, Moncton, NB E1C 8X3, Canada
| | - Alyssa E. Patterson
- Department of Chemistry and Biochemistry, Mount Allison University, Sackville, NB E4L 1G8, Canada
| | - Christopher M. Vogels
- Department of Chemistry and Biochemistry, Mount Allison University, Sackville, NB E4L 1G8, Canada
| | - Andreas Decken
- Department of Chemistry, University of New Brunswick, Fredericton, NB E3B 5A3, Canada
| | - Gilles A. Robichaud
- Département de chimie et biochimie, Université de Moncton, Campus de Moncton, Moncton, NB E1A 3E9, Canada
- Atlantic Cancer Research Institute, Moncton, NB E1C 8X3, Canada
| | - Sandra Turcotte
- Département de chimie et biochimie, Université de Moncton, Campus de Moncton, Moncton, NB E1A 3E9, Canada
- Atlantic Cancer Research Institute, Moncton, NB E1C 8X3, Canada
| | - Stephen A. Westcott
- Department of Chemistry and Biochemistry, Mount Allison University, Sackville, NB E4L 1G8, Canada
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20
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Hérault D, Nguyen DH, Nuel D, Buono G. Reduction of secondary and tertiary phosphine oxides to phosphines. Chem Soc Rev 2015; 44:2508-28. [DOI: 10.1039/c4cs00311j] [Citation(s) in RCA: 151] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
In this review, we summarise all the methods of phosphine oxide reduction and discuss their mechanistic aspects.
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Affiliation(s)
- Damien Hérault
- Aix Marseille Université
- Centrale Marseille
- CNRS
- ISM2 UMR 7313
- Marseille
| | - Duc Hanh Nguyen
- Aix Marseille Université
- Centrale Marseille
- CNRS
- ISM2 UMR 7313
- Marseille
| | - Didier Nuel
- Aix Marseille Université
- Centrale Marseille
- CNRS
- ISM2 UMR 7313
- Marseille
| | - Gérard Buono
- Aix Marseille Université
- Centrale Marseille
- CNRS
- ISM2 UMR 7313
- Marseille
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21
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Holthausen MH, Mallov I, Stephan DW. Phosphinimine-substituted boranes and borenium ions. Dalton Trans 2014; 43:15201-11. [DOI: 10.1039/c4dt02406k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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22
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Anaby A, Butschke B, Ben-David Y, Shimon LJW, Leitus G, Feller M, Milstein D. B–H Bond Cleavage via Metal–Ligand Cooperation by Dearomatized Ruthenium Pincer Complexes. Organometallics 2014. [DOI: 10.1021/om500311a] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Aviel Anaby
- Department of Organic
Chemistry and ‡Department of Chemical Research Support, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Burkhard Butschke
- Department of Organic
Chemistry and ‡Department of Chemical Research Support, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Yehoshoa Ben-David
- Department of Organic
Chemistry and ‡Department of Chemical Research Support, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Linda J. W. Shimon
- Department of Organic
Chemistry and ‡Department of Chemical Research Support, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Gregory Leitus
- Department of Organic
Chemistry and ‡Department of Chemical Research Support, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Moran Feller
- Department of Organic
Chemistry and ‡Department of Chemical Research Support, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - David Milstein
- Department of Organic
Chemistry and ‡Department of Chemical Research Support, The Weizmann Institute of Science, Rehovot 76100, Israel
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23
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Anker MD, Arrowsmith M, Bellham P, Hill MS, Kociok-Köhn G, Liptrot DJ, Mahon MF, Weetman C. Selective reduction of CO2 to a methanol equivalent by B(C6F5)3-activated alkaline earth catalysis. Chem Sci 2014. [DOI: 10.1039/c4sc00885e] [Citation(s) in RCA: 112] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Magnesium and calcium hydrido-tris(pentafluorophenyl)borate derivatives catalyse the completely selective reductive hydroboration of CO2 with pinacolborane (HBpin) to provide the methanol equivalent, CH3OBpin.
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24
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Braunschweig H, Guethlein F, Mailänder L, Marder TB. Synthesis of Catechol-, Pinacol-, and Neopentylglycolborane through the Heterogeneous Catalytic BB Hydrogenolysis of Diboranes(4). Chemistry 2013; 19:14831-5. [DOI: 10.1002/chem.201302677] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2013] [Indexed: 11/06/2022]
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25
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Peschiulli A, Smout V, Storr TE, Mitchell EA, Eliáš Z, Herrebout W, Berthelot D, Meerpoel L, Maes BUW. Ruthenium-Catalyzed α-(Hetero)Arylation of Saturated Cyclic Amines: Reaction Scope and Mechanism. Chemistry 2013; 19:10378-87. [DOI: 10.1002/chem.201204438] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Revised: 04/11/2013] [Indexed: 11/05/2022]
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26
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Enthaler S, Krackl S, Irran E, Inoue S. Deoxygenation of Sulfoxides to Sulfides in the Presence of Zinc Catalysts and Boranes as Reducing Reagents. Catal Letters 2012. [DOI: 10.1007/s10562-012-0862-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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27
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Braunschweig H, Guethlein F. Übergangsmetall-katalysierte Synthese von Diboranen(4). Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201104854] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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28
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Braunschweig H, Guethlein F. Transition-Metal-Catalyzed Synthesis of Diboranes(4). Angew Chem Int Ed Engl 2011; 50:12613-6. [DOI: 10.1002/anie.201104854] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2011] [Revised: 09/08/2011] [Indexed: 11/11/2022]
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Kokatla HP, Thomson PF, Bae S, Doddi VR, Lakshman MK. Reduction of amine N-oxides by diboron reagents. J Org Chem 2011; 76:7842-8. [PMID: 21812467 DOI: 10.1021/jo201192c] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Facile reduction of alkylamino-, anilino-, and pyridyl-N-oxides can be achieved via the use of diboron reagents, predominantly bis(pinacolato)- and in some cases bis(catecholato)diboron [(pinB)(2) and (catB)(2), respectively]. Reductions occur upon simply mixing the amine N-oxide and the diboron reagent in a suitable solvent, at a suitable temperature. Extremely fast reductions of alkylamino- and anilino-N-oxides occur, whereas pyridyl-N-oxides undergo slower reduction. The reaction is tolerant of a variety of functionalities such as hydroxyl, thiol, and cyano groups, as well as halogens. Notably, a sensitive nucleoside N-oxide has also been reduced efficiently. The different rates with which alkylamino- and pyridyl-N-oxides are reduced has been used to perform stepwise reduction of the N,N'-dioxide of (S)-(-)-nicotine. Because it was observed that (pinB)(2) was unaffected by the water of hydration in amine oxides, the feasibility of using water as solvent was evaluated. These reactions also proceeded exceptionally well, giving high product yields. In constrast to the reactions with (pinB)(2), triethylborane reduced alkylamino-N-oxides, but pyridine N-oxide did not undergo efficient reduction even at elevated temperature. Finally, the mechanism of the reductive process by (pinB)(2) has been probed by (1)H and (11)B NMR.
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Affiliation(s)
- Hari Prasad Kokatla
- Department of Chemistry, The City College and The City University of New York, 160 Convent Avenue, New York, New York 10031-9198, United States
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31
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GEIER MJ, VOGELS CM, DECKEN A, WESTCOTT SA. Synthesis and Molecular Structure of 4,6-Di-tert-butyl-2-mesitylbenzo-[d][1,3,2]dioxaborole. X-RAY STRUCTURE ANALYSIS ONLINE 2011. [DOI: 10.2116/xraystruct.27.33] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Michael J. GEIER
- Department of Chemistry and Biochemistry, Mount Allison University
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Hunter NM, Vogels CM, Decken A, Bell A, Westcott SA. [Cp*IrCl2]2 catalyzed hydroborations of alkenes using a bulky dioxaborocine. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2010.09.051] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Abstract
AbstractAddition of pinacolborane (HBO2C2Me4) to 2-iodoaniline can be catalyzed using a number of palladium complexes, including [(t-Bu)2PCl]2PdCl2 (PXPd), to give the corresponding boronate ester 2-H2NC6H4(BO2C2Me4) in excellent yields. The PXPd system could also be used in the catalyzed borylation of substituted anilines to give the corresponding aminoboronate esters in moderate to high yields.
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Wallis CJ, Kraft IL, Patrick BO, Mehrkhodavandi P. Electron rich bidentate phosphinimine-imine ligands: Synthesis and reactivity of late transition metal complexes. Dalton Trans 2010:541-7. [DOI: 10.1039/b912783f] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Ahijado Salomon M, Braun T, Penner A. Stepwise Oxygenation of Pinacolborane by a Rhodiumperoxo Complex: Detection of an Intermediate Metal Borate and Perborate. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200803768] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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36
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Stepwise Oxygenation of Pinacolborane by a Rhodiumperoxo Complex: Detection of an Intermediate Metal Borate and Perborate. Angew Chem Int Ed Engl 2008; 47:8867-71. [DOI: 10.1002/anie.200803768] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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37
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Ahijado M, Braun T. Rhodium Derivatives of Peroxoboronic Acids and Peroxoboric Acid: Formation of Metallatrioxaborolanes from an η2-Peroxo Complex. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200705715] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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38
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Ahijado M, Braun T. Rhodium Derivatives of Peroxoboronic Acids and Peroxoboric Acid: Formation of Metallatrioxaborolanes from an η2-Peroxo Complex. Angew Chem Int Ed Engl 2008; 47:2954-8. [DOI: 10.1002/anie.200705715] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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39
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Fritschi CB, Wernitz SM, Vogels CM, Shaver MP, Decken A, Bell A, Westcott SA. 4,4,5,5-Tetraphenyl-1,3,2-dioxaborolane: A Bulky Borane for the Transition Metal Catalysed Hydroboration of Alkenes. Eur J Inorg Chem 2008. [DOI: 10.1002/ejic.200701066] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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40
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Courtenay S, Walsh D, Hawkeswood S, Wei P, Das AK, Stephan DW. Boron and Aluminum Complexes of Sterically Demanding Phosphinimines and Phosphinimides. Inorg Chem 2007; 46:3623-31. [PMID: 17378556 DOI: 10.1021/ic0700351] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Reactions of sterically demanding phosphinimines R3PNH [R=i-Pr (1), t-Bu (2)] were examined. Reactions with B(C6F5)3 formed the adducts (R3PNH)B(C6F5)3 [R=i-Pr (3), t-Bu (4)] in high yield. On the other hand, 2 reacts with HB(OBu)2, evolving H2 to give t-Bu3PNB(OBu)2 (5). The reaction of 2 equiv of 2 with BH3.SMe2 affords the species (t-Bu3PN)2BH (6). In contrast, the reaction of n-Bu(t-Bu)2PNH with BH3.SMe2 results in the formation of the robust adduct n-Bu(t-Bu)2PNH.BH3 (8). An alternative route to borane-phosphinimide complexes involves Me3SiCl elimination, as exemplified by the reaction of BCl2Ph with n-Bu3PNSiMe3, which gives the product n-Bu3PNBCl(Ph) (9). The corresponding reactions of the parent phosphinimines 1 and 2 with AlH3.NMe2Et give the dimers [(mu-i-Pr3PN)AlH2]2 (10) and [(mu-t-Bu3PN)AlH2]2 (11). Species 11 reacts further with Me3SiO3SCF3 to provide [(mu-t-Bu3PN)AlH(OSO2CF3)]2 (12). The reaction of the lithium salt [t-Bu3PNLi]4 (13) with BCl3 proceeds smoothly to give t-Bu3PNBCl2 (14), which is readily alkylated to give t-Bu3PNBMe2 (15). Subsequent reaction of 15 with B(C6F5)3 results in methyl abstraction and the formation of [(mu-t-Bu3PN)BMe]2[MeB(C6F5)3]2 (16). The reaction of 13 in a 2:1 ratio with BCl3 gives the salt [(t-Bu3PN)2B]Cl (17). This species can be methylated to give (t-Bu3PN)2BMe (18), which undergoes subsequent reaction with [Ph3C][X] (X=[B(C6F5)4], [PF6]) to form the related salts [(t-Bu3PN)2B][B(C6F5)4] (19) and [(t-Bu3PN)2B][PF6] (20), respectively. Analogous reactions with [Ph3C][BF4] afforded [t-Bu3PNBF2]2 (21). Compounds 3, 4, 6, 8, 11, 12, 17, 19, and 21 were characterized by X-ray crystallography.
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Affiliation(s)
- Silke Courtenay
- Department of Chemistry & Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4
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