1
|
Mondal S, Sarkar S, Mandal C, Mallick D, Mukherjee D. Fluorenyl-tethered N-heterocyclic carbene (NHC): an exclusive C-donor ligand for heteroleptic calcium and strontium chemistry. Chem Commun (Camb) 2024; 60:4553-4556. [PMID: 38568715 DOI: 10.1039/d4cc00397g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/24/2024]
Abstract
Exclusive C-donating ligands are rarely used with kinetically labile heavier alkaline earths (Ca, Sr, Ba). We report herein the aptitude of a combination of NHC with fluorenyl connected by a flexible -(CH2)2- linker as a ligand support for heteroleptic Ca- and Sr-N(SiMe3)2 and iodides. The Ca-N(SiMe3)2 complex even catalyzes the intramolecular hydroamination of aminoalkenes to showcase the effectiveness of this ligand framework.
Collapse
Affiliation(s)
- Sumana Mondal
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, Nadia, 741246, West Bengal, India.
| | - Subham Sarkar
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, Nadia, 741246, West Bengal, India.
- Department of Chemistry, Presidency University, 86/1 College Street, Kolkata, West Bengal, 700073, India.
| | - Chhotan Mandal
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, Nadia, 741246, West Bengal, India.
| | - Dibyendu Mallick
- Department of Chemistry, Presidency University, 86/1 College Street, Kolkata, West Bengal, 700073, India.
| | - Debabrata Mukherjee
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, Nadia, 741246, West Bengal, India.
| |
Collapse
|
2
|
Lyubov DM, Zakaria H, Nelyubina YV, Aysin RR, Bukalov SS, Trifonov AA. Ca(II) and Yb(II) complexes featuring M(C≡C) 4 structural motif: enforced proximity or genuine η 2 -bonding? Chemistry 2024; 30:e202303533. [PMID: 38070175 DOI: 10.1002/chem.202303533] [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: 10/25/2023] [Indexed: 01/12/2024]
Abstract
Bis(carbazolide) complexes M[3,6-tBu2 -1,8-(RC≡C)2 Carb]2 (THF)n (R=SiMe3 , n=0, M=Ca, Yb; R=Ph, n=1, M=Ca, Yb; n=0, M=Yb) were synthesized through transamination reaction of M[N(SiMe3 )2 ]2 (THF)2 with two molar equivalents of carbazoles. The complexes feature M(η2 -C≡C)4 structural motif composed of M(II) ions encapsulated by four acetylene fragments due to atypical for alkaline- and rare-earth metals η2 -interactions with triple C≡C bond. This interaction is evidenced experimentally by X-ray diffraction, Raman spectroscopy in the solid state and by NMR-spectroscopy in the solution. According to QTAIM analysis there are 4 bond critical points (3;-1) between the metal atom and each of the triple bonds, which are connected by a strongly curved, almost T-shaped bond pathway.
Collapse
Affiliation(s)
- Dmitry M Lyubov
- G. A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences, Russia, 49 Tropinina str., GSP-445, 603950, Nizhny Novgorod
| | - Hamza Zakaria
- G. A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences, Russia, 49 Tropinina str., GSP-445, 603950, Nizhny Novgorod
- N. I. Lobachevsky State University of Nizhny Novgorod, Gagarina Avenue 23, 603950, Nizhny Novgorod, Russia
| | - Yulia V Nelyubina
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, Gagarina Avenue 23, 603950, Nizhny Novgorod, Russia
- 28 Vavilova str., 119334, Moscow, Russia
| | - Rinat R Aysin
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, Gagarina Avenue 23, 603950, Nizhny Novgorod, Russia
- 28 Vavilova str., 119334, Moscow, Russia
| | - Sergey S Bukalov
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, Gagarina Avenue 23, 603950, Nizhny Novgorod, Russia
- 28 Vavilova str., 119334, Moscow, Russia
| | - Alexander A Trifonov
- G. A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences, Russia, 49 Tropinina str., GSP-445, 603950, Nizhny Novgorod
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, Gagarina Avenue 23, 603950, Nizhny Novgorod, Russia
- 28 Vavilova str., 119334, Moscow, Russia
| |
Collapse
|
3
|
Ni C, Pang Z, Qiao Y, Guo P, Ma X, Yang Z. Organoaluminum derived from Schiff bases: Synthesis, characterization and catalytic performance in hydroboration. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2022.121199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
4
|
Schüler P, Sengupta S, Koch A, Görls H, Krieck S, Westerhausen M. In situ Grignard Metalation Method, Part II: Scope of the One-Pot Synthesis of Organocalcium Compounds. Chemistry 2022; 28:e202201897. [PMID: 35912418 PMCID: PMC9804548 DOI: 10.1002/chem.202201897] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Indexed: 01/05/2023]
Abstract
The in situ Grignard Metalation Method (iGMM) is a straightforward one-pot strategy to synthesize alkaline-earth metal amides in multi-gram scale with high yields via addition of bromoethane to an ethereal suspension of a primary or secondary amine and magnesium (Part I) or calcium (Part II). This method is highly advantageous because no activation of calcium is required prior to the reaction. Contrary to the magnesium-based iGMM, there are some limitations, the most conspicuous one is the large influence of steric factors. The preparation of Ca(hmds)2 succeeds smoothly within a few hours with excellent yields opening the opportunity to prepare large amounts of this reagent. Side reactions and transfer of the iGMM to substituted anilines and N-heterocycles as well as other H-acidic substrates such as cyclopentadienes are studied. Bulky amidines cannot be converted directly to calcium amidinates via the iGMM but stoichiometric calciation with Ca(hmds)2 enables their preparation.
Collapse
Affiliation(s)
- Philipp Schüler
- Institute of Inorganic and Analytical Chemistry, Friedrich Schiller University Jena, Humboldtstraße 8, 07743, Jena, Germany
| | - Simon Sengupta
- Institute of Inorganic and Analytical Chemistry, Friedrich Schiller University Jena, Humboldtstraße 8, 07743, Jena, Germany
| | - Alexander Koch
- Institute of Inorganic and Analytical Chemistry, Friedrich Schiller University Jena, Humboldtstraße 8, 07743, Jena, Germany
| | - Helmar Görls
- Institute of Inorganic and Analytical Chemistry, Friedrich Schiller University Jena, Humboldtstraße 8, 07743, Jena, Germany
| | - Sven Krieck
- Institute of Inorganic and Analytical Chemistry, Friedrich Schiller University Jena, Humboldtstraße 8, 07743, Jena, Germany
| | - Matthias Westerhausen
- Institute of Inorganic and Analytical Chemistry, Friedrich Schiller University Jena, Humboldtstraße 8, 07743, Jena, Germany
| |
Collapse
|
5
|
Stevens MP, Spray E, Vitorica-Yrezabal IJ, Singh K, Timmermann VM, Sotorrios L, Ortu F. Structural Investigation of Magnesium Complexes Supported by a Thiopyridyl Scorpionate Ligand. Molecules 2022; 27:molecules27144564. [PMID: 35889437 PMCID: PMC9318590 DOI: 10.3390/molecules27144564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Revised: 07/12/2022] [Accepted: 07/14/2022] [Indexed: 12/03/2022] Open
Abstract
Herein, we report the synthesis of a series of heteroleptic magnesium complexes stabilized with the scorpionate ligand tris(2-pyridylthio)methanide (Tptm). The compounds of the general formula [Mg(Tptm)(X)] (1-X; X = Cl, Br, I) were obtained via protonolysis reaction between the proligand and selected Grignard reagents. Attempts to isolate the potassium derivative K(Tptm) lead to decomposition of Tptm and formation of the alkene (C5H4N-S)2C=C(C5H4N-S)2, and this degradation was also modelled using DFT methods. Compound 1-I was treated with K(CH2Ph), affording the degradation product [Mg(Bptm)2] (2; Bptm = {CH(S-C5NH3)2}−). We analyzed and quantified the steric properties of the Tptm ligand using the structural information of the compounds obtained in this study paired with buried volume calculations, also adding the structural data of HTptm and its CF3-substituted congener (HTptmCF3). These studies highlight the highly flexible nature of this ligand scaffold and its ability to stabilize various coordination motifs and geometries, which is a highly desirable feature in the design of novel organometallic reagents and catalysts.
Collapse
Affiliation(s)
- Matthew P. Stevens
- School of Chemistry, University of Leicester, University Road, Leicester LE1 7RH, UK; (M.P.S.); (E.S.); (K.S.); (V.M.T.)
| | - Emily Spray
- School of Chemistry, University of Leicester, University Road, Leicester LE1 7RH, UK; (M.P.S.); (E.S.); (K.S.); (V.M.T.)
| | | | - Kuldip Singh
- School of Chemistry, University of Leicester, University Road, Leicester LE1 7RH, UK; (M.P.S.); (E.S.); (K.S.); (V.M.T.)
| | - Vanessa M. Timmermann
- School of Chemistry, University of Leicester, University Road, Leicester LE1 7RH, UK; (M.P.S.); (E.S.); (K.S.); (V.M.T.)
| | - Lia Sotorrios
- Institute of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, UK
- Correspondence: (L.S.); (F.O.); Tel.: +44-(0)116-294-4670 (F.O.)
| | - Fabrizio Ortu
- School of Chemistry, University of Leicester, University Road, Leicester LE1 7RH, UK; (M.P.S.); (E.S.); (K.S.); (V.M.T.)
- Correspondence: (L.S.); (F.O.); Tel.: +44-(0)116-294-4670 (F.O.)
| |
Collapse
|
6
|
|
7
|
Gong X, Deng P, Cheng J. Calcium Mediated C—H Silylation of Aromatic Heterocycles with Hydrosilanes. ChemCatChem 2022. [DOI: 10.1002/cctc.202200060] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Xun Gong
- Changchun Institute of Applied Chemistry Chinese Academy of Sciences: Chang Chun Institute of Applied Chemistry Chinese Academy of Sciences State Key Laboratory of Polymer Physics and Chemistry CHINA
| | - Peng Deng
- Changchun Institute of Applied Chemistry Chinese Academy of Sciences: Chang Chun Institute of Applied Chemistry Chinese Academy of Sciences State Key Laboratory of Polymer Physics and Chemistry CHINA
| | - Jianhua Cheng
- Changchun Institute of Applied Chemistry State Key Laboratory of Polymer Physics and Chemistry Renmin Street. No. 5625 130022 Changchun CHINA
| |
Collapse
|
8
|
Abstract
The addition of a B-H bond to an unsaturated bond (polarized or unpolarized) is a powerful and atom-economic tool for the synthesis of organoboranes. In recent years, s-block organometallics have appeared as alternative catalysts to transition-metal complexes, which traditionally catalyze the hydroboration of unsaturated bonds. Because of the recent and rapid development in the field of hydroboration of unsaturated bonds catalyzed by alkali (Li, Na, K) and alkaline earth (Mg, Ca, Sr, Ba) metals, we provide a detailed and updated comprehensive review that covers the synthesis, reactivity, and application of s-block metal catalysts in the hydroboration of polarized as well as unsaturated carbon-carbon bonds. Moreover, we describe the main reaction mechanisms, providing valuable insight into the reactivity of the s-block metal catalysts. Finally, we compare these s-block metal complexes with other redox-neutral catalytic systems based on p-block metals including aluminum complexes and f-block metal complexes of lanthanides and early actinides. In this review, we aim to provide a comprehensive, authoritative, and critical assessment of the state of the art within this highly interesting research area.
Collapse
Affiliation(s)
- Marc Magre
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Marcin Szewczyk
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Magnus Rueping
- Chemical Science Program, Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), KAUST Catalysis Center, Thuwal 23955-6900, Kingdom of Saudi Arabia
| |
Collapse
|
9
|
Buchner MR, Thomas-Hargreaves LR. s-Block chemistry in weakly coordinating solvents. Dalton Trans 2021; 50:16916-16922. [PMID: 34738606 DOI: 10.1039/d1dt03443j] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Alkaline earth metal catalysis has been a growing field in recent years. To enhance reactivity and to understand the metal-substrate interactions in more detail, reactions are increasingly carried out in weakly coordinating solvents. This article gives an overview over the two main approaches to facilitate this, which are either through the employment of highly dipolar haloaryls as solvents, or by increasing the solubility of the ligand systems. The resulting coordination modes and reactivities are presented together with the synthetic strategies. Additionally, the latest results of group 1 complex chemistry in aliphatic solvents are illustrated and future challenges are highlighted.
Collapse
Affiliation(s)
- Magnus R Buchner
- Anorganische Chemie, Nachwuchsgruppe Hauptgruppenmetallchemie, Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, 35032 Marburg, Germany.
| | - Lewis R Thomas-Hargreaves
- Anorganische Chemie, Nachwuchsgruppe Hauptgruppenmetallchemie, Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, 35032 Marburg, Germany.
| |
Collapse
|
10
|
Ankur, Kannan R, Chambenahalli R, Banerjee S, Yang Y, Maron L, Venugopal A. [(Me
6
TREN)MgOCHPh
2
][B(C
6
F
5
)
4
]: A Model Complex to Explore the Catalytic Activity of Magnesium Alkoxides in Ketone Hydroboration. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100651] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Ankur
- School of Chemistry Indian Institute of Science Education and Research Thiruvananthapuram Vithura Thiruvananthapuram 695551 India
| | - Ramkumar Kannan
- School of Chemistry Indian Institute of Science Education and Research Thiruvananthapuram Vithura Thiruvananthapuram 695551 India
| | - Raju Chambenahalli
- School of Chemistry Indian Institute of Science Education and Research Thiruvananthapuram Vithura Thiruvananthapuram 695551 India
| | - Sumanta Banerjee
- School of Chemistry Indian Institute of Science Education and Research Thiruvananthapuram Vithura Thiruvananthapuram 695551 India
| | - Yan Yang
- LPCNO, UMR 5215, INSA, UPS Université de Toulouse-CNRS 31000 Toulouse France
| | - Laurent Maron
- LPCNO, UMR 5215, INSA, UPS Université de Toulouse-CNRS 31000 Toulouse France
| | - Ajay Venugopal
- School of Chemistry Indian Institute of Science Education and Research Thiruvananthapuram Vithura Thiruvananthapuram 695551 India
| |
Collapse
|
11
|
Thum K, Martin J, Elsen H, Eyselein J, Stiegler L, Langer J, Harder S. Lewis Acidic Cationic Strontium and Barium Complexes. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100345] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Katharina Thum
- Chair of Inorganic and Organometallic Chemistry Universität Erlangen-Nürnberg Egerlandstraße 1 91058 Erlangen Germany
| | - Johannes Martin
- Chair of Inorganic and Organometallic Chemistry Universität Erlangen-Nürnberg Egerlandstraße 1 91058 Erlangen Germany
| | - Holger Elsen
- Chair of Inorganic and Organometallic Chemistry Universität Erlangen-Nürnberg Egerlandstraße 1 91058 Erlangen Germany
| | - Jonathan Eyselein
- Chair of Inorganic and Organometallic Chemistry Universität Erlangen-Nürnberg Egerlandstraße 1 91058 Erlangen Germany
| | - Lena Stiegler
- Chair of Inorganic and Organometallic Chemistry Universität Erlangen-Nürnberg Egerlandstraße 1 91058 Erlangen Germany
| | - Jens Langer
- Chair of Inorganic and Organometallic Chemistry Universität Erlangen-Nürnberg Egerlandstraße 1 91058 Erlangen Germany
| | - Sjoerd Harder
- Chair of Inorganic and Organometallic Chemistry Universität Erlangen-Nürnberg Egerlandstraße 1 91058 Erlangen Germany
| |
Collapse
|
12
|
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: 17] [Impact Index Per Article: 5.7] [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.
Collapse
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
| |
Collapse
|
13
|
Grundy ME, Yuan K, Nichol GS, Ingleson MJ. Zinc catalysed electrophilic C-H borylation of heteroarenes. Chem Sci 2021; 12:8190-8198. [PMID: 34194709 PMCID: PMC8208323 DOI: 10.1039/d1sc01883c] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2021] [Accepted: 05/12/2021] [Indexed: 01/20/2023] Open
Abstract
Cationic zinc Lewis acids catalyse the C-H borylation of heteroarenes using pinacol borane (HBPin) or catechol borane (HBCat). An electrophile derived from [IDippZnEt][B(C6F5)4] (IDipp = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene) combined with N,N-dimethyl-p-toluidine (DMT) proved the most active in terms of C-H borylation scope and yield. Using this combination weakly activated heteroarenes, such as thiophene, were amenable to catalytic C-H borylation using HBCat. Competition reactions show these IDipp-zinc cations are highly oxophilic but less hydridophilic (relative to B(C6F5)3), and that borylation proceeds via activation of the hydroborane (and not the heteroarene) by a zinc electrophile. Based on DFT calculations this activation is proposed to proceed by coordination of a hydroborane oxygen to the zinc centre to generate a boron electrophile that effects C-H borylation. Thus, Lewis acid binding to oxygen sites of hydroboranes represents an under-developed route to access reactive borenium-type electrophiles for C-H borylation.
Collapse
Affiliation(s)
- Matthew E Grundy
- EaStCHEM School of Chemistry, University of Edinburgh Edinburgh EH9 3FJ UK
| | - Kang Yuan
- EaStCHEM School of Chemistry, University of Edinburgh Edinburgh EH9 3FJ UK
| | - Gary S Nichol
- EaStCHEM School of Chemistry, University of Edinburgh Edinburgh EH9 3FJ UK
| | - Michael J Ingleson
- EaStCHEM School of Chemistry, University of Edinburgh Edinburgh EH9 3FJ UK
| |
Collapse
|
14
|
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]
|
15
|
Affiliation(s)
- Ruibin Wang
- Department of Chemistry Guangdong Technion Israel Institute of Technology Guangdong 515063 P. R. China
| | - Sehoon Park
- Department of Chemistry Guangdong Technion Israel Institute of Technology Guangdong 515063 P. R. China
- Technion-Israel Institute of Technology Technion City 32000 Haifa Israel
| |
Collapse
|
16
|
Anga S, Acharya J, Chandrasekhar V. An Unsymmetric Imino-Phosphanamidinate Ligand and its Y(III) Complex: Synthesis, Characterization, and Catalytic Hydroboration of Carbonyl Compounds. J Org Chem 2021; 86:2224-2234. [PMID: 33290079 DOI: 10.1021/acs.joc.0c02383] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An imino-phosphanamide ligand, [NHIiPr2Me2P(Ph)NH-2,6-iPr2C6H3] (LH), containing two different N-substituents was prepared by the direct reaction of the lithium salt of N-heterocyclic imine (NHI) with phenylchloro-2,6-diisopropylphenyl phosphanamine, PhP(Cl)NH-2,6-iPr2-C6H3. Reaction of LH with Y(N(SiMe3)2)3 afforded the heteroleptic complex, [{L}Y(N(SiMe3)2)2] (1), by elimination of HN(SiMe3)2. Compound 1 was characterized by multinuclear NMR and X-ray crystallography. In the complex, the Y(III) center was found to be tetracoordinate in a distorted tetrahedral geometry. The ligand, imino-phosphanamidinate, [L]-, functions in a chelating manner, and its coordination to Y(III) results in a distorted 4-membered YPN2 ring. As a proof of principle of its activity, 1 was used as a precatalyst for the hydroboration of various aldehydes and ketones using HBpin as the hydrogen source. The hydroboration reaction was rapid and clean even with low catalyst loadings (0.01-0.1 mol %). In addition, a very good functional group tolerance was observed in these reactions.
Collapse
Affiliation(s)
- Srinivas Anga
- Tata Institute of Fundamental Research Hyderabad, Gopanpally 500046, Hyderabad, India
| | - Joydev Acharya
- Tata Institute of Fundamental Research Hyderabad, Gopanpally 500046, Hyderabad, India.,Department of Chemistry, IIT Kanpur, Kanpur 208016, India
| | - Vadapalli Chandrasekhar
- Tata Institute of Fundamental Research Hyderabad, Gopanpally 500046, Hyderabad, India.,Department of Chemistry, IIT Kanpur, Kanpur 208016, India
| |
Collapse
|
17
|
Zhao L, Shi X, Cheng J. Calcium-Catalyzed Dehydrogenative Silylation of Aromatic Ethers with Hydrosilane. ACS Catal 2021. [DOI: 10.1021/acscatal.0c05440] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Lanxiao Zhao
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, No. 5625, Renmin Street, Changchun 130022, China
- University of Science and Technology of China, Hefei, Anhui 230029, China
| | - Xianghui Shi
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, No. 5625, Renmin Street, Changchun 130022, China
| | - Jianhua Cheng
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, No. 5625, Renmin Street, Changchun 130022, China
- University of Science and Technology of China, Hefei, Anhui 230029, China
| |
Collapse
|
18
|
Lamb JR, Brown CM, Johnson JA. N-Heterocyclic carbene-carbodiimide (NHC-CDI) betaine adducts: synthesis, characterization, properties, and applications. Chem Sci 2021; 12:2699-2715. [PMID: 34164037 PMCID: PMC8179359 DOI: 10.1039/d0sc06465c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Accepted: 01/18/2021] [Indexed: 11/21/2022] Open
Abstract
N-Heterocyclic carbenes (NHCs) are an important class of reactive organic molecules used as ligands, organocatalysts, and σ-donors in a variety of electroneutral ylide or betaine adducts with main-group compounds. An emerging class of betaine adducts made from the reaction of NHCs with carbodiimides (CDIs) form zwitterionic amidinate-like structures with tunable properties based on the highly modular NHC and CDI scaffolds. The adduct stability is controlled by the substituents on the CDI nitrogens, while the NHC substituents greatly affect the configuration of the adduct in the solid state. This Perspective is intended as a primer to these adducts, touching on their history, synthesis, characterization, and general properties. Despite the infancy of the field, NHC-CDI adducts have been applied as amidinate-type ligands for transition metals and nanoparticles, as junctions in zwitterionic polymers, and to stabilize distonic radical cations. These applications and potential future directions are discussed.
Collapse
Affiliation(s)
- Jessica R Lamb
- Department of Chemistry, Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge Massachusetts 02139 USA
| | - Christopher M Brown
- Department of Chemistry, Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge Massachusetts 02139 USA
| | - Jeremiah A Johnson
- Department of Chemistry, Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge Massachusetts 02139 USA
| |
Collapse
|
19
|
McMullen JS, Edwards AJ, Hicks J. C-H and C-F coordination of arenes in neutral alkaline earth metal complexes. Dalton Trans 2021; 50:8685-8689. [PMID: 34160514 DOI: 10.1039/d1dt01532j] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
A series of neutral magnesium and calcium complexes bearing an extremely bulky diamido ligand have been synthesised and crystallographically characterised. A number of these complexes feature rare group 2 metalaromatic interactions, such as the η6-coordination of benzene and 'agostic-like' C-H coordination, the latter previously unseen in neutral Mg and Ca complexes.
Collapse
Affiliation(s)
- Jacob S McMullen
- Research School of Chemistry, Australian National University, ACT 2601, Australia.
| | - Alison J Edwards
- Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation, Sydney, New South Wales 2234, Australia
| | - Jamie Hicks
- Research School of Chemistry, Australian National University, ACT 2601, Australia.
| |
Collapse
|
20
|
Bage AD, Nicholson K, Hunt TA, Langer T, Thomas SP. The Hidden Role of Boranes and Borohydrides in Hydroboration Catalysis. ACS Catal 2020. [DOI: 10.1021/acscatal.0c04051] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Andrew D. Bage
- EaStCHEM School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom
| | - Kieran Nicholson
- EaStCHEM School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom
| | - Thomas A. Hunt
- Medicinal Chemistry, Early Oncology, AstraZeneca, Unit 310, Cambridge Science Park, Milton Road, Cambridge, CB4 0WG, United Kingdom
| | - Thomas Langer
- Pharmaceutical Technology & Development, Chemical Development U.K., AstraZeneca, Silk Road, Macclesfield, SK10 2NA, United Kingdom
| | - Stephen P. Thomas
- EaStCHEM School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom
| |
Collapse
|
21
|
Martin J, Eyselein J, Langer J, Elsen H, Harder S. Large decanuclear calcium and strontium hydride clusters. Chem Commun (Camb) 2020; 56:9178-9181. [DOI: 10.1039/d0cc04330c] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The largest, most hydride-rich, Ca10H16 cluster is formed by condensation of two smaller Ca6H9 octahedrons (the isostructural Sr hydride cluster is also reported).
Collapse
Affiliation(s)
- Johannes Martin
- Friedrich-Alexander-Universität Erlangen-Nürnberg
- Inorganic and Organometallic Chemistry
- Erlangen
- Germany
| | - Jonathan Eyselein
- Friedrich-Alexander-Universität Erlangen-Nürnberg
- Inorganic and Organometallic Chemistry
- Erlangen
- Germany
| | - Jens Langer
- Friedrich-Alexander-Universität Erlangen-Nürnberg
- Inorganic and Organometallic Chemistry
- Erlangen
- Germany
| | - Holger Elsen
- Friedrich-Alexander-Universität Erlangen-Nürnberg
- Inorganic and Organometallic Chemistry
- Erlangen
- Germany
| | - Sjoerd Harder
- Friedrich-Alexander-Universität Erlangen-Nürnberg
- Inorganic and Organometallic Chemistry
- Erlangen
- Germany
| |
Collapse
|