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Parra-Cadenas B, Bravo I, Ripoll Lorente MC, Ginés C, Elorriaga D, Carrillo-Hermosilla F. Boron Complexes with Propiolamidinato Ligands: Synthesis, Structure, and Photophysical Properties. Inorg Chem 2024; 63:12120-12132. [PMID: 38873888 PMCID: PMC11220760 DOI: 10.1021/acs.inorgchem.4c01241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2024] [Revised: 06/04/2024] [Accepted: 06/10/2024] [Indexed: 06/15/2024]
Abstract
Two series of boron derivatives with propiolamidinato ligands, [BPh2{C(C≡CAr)(NR)2}] (Ar = Ph, p-MeOPh, p-FPh, p-Me2NPh, or phen; R = iPr or p-tolyl), were synthesized and structurally characterized. The corresponding propiolamidine (or propargylamidine) proligands have been obtained through sustainable methods. One is the catalytic hydroalkynylation of diisopropylcarbodiimide with different terminal alkynes, using simple ZnEt2 as a precatalyst. Alternatively, to obtain propiolamidines with aromatic groups on the nitrogen atoms, the formation of lithiated derivatives of terminal alkynes by reaction with n-BuLi in air and at room temperature, and subsequent addition to the di-p-tolylcarbodiimide, under the same conditions and using 2-MeTHF as a sustainable solvent, has been used for the first time. After reaction with BPh3, the corresponding boron amidinates were obtained, which are emissive in the solution state. The influence of the different substituents introduced into the ligands on the photophysical properties of the boron compounds has been studied. One of the obtained compounds can be used as a ratiometric fluorescent pH sensor in the acidic range.
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Affiliation(s)
- Blanca Parra-Cadenas
- Departamento
de Química Inorgánica, Orgánica y Bioquímica-Centro
de Innovación en Química Avanzada (ORFEO-CINQA), Facultad
de Ciencias y Tecnologías Químicas, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain
| | - Iván Bravo
- Grupo
FOTOAIR, Unidad nanoDrug, Departamento de Química-Física,
Facultad de Farmacia de Albacete, Universidad
de Castilla-La Mancha, 02008 Albacete, Spain
| | - M. Consuelo Ripoll Lorente
- Grupo
FOTOAIR, Unidad nanoDrug, Departamento de Química-Física,
Facultad de Farmacia de Albacete, Universidad
de Castilla-La Mancha, 02008 Albacete, Spain
| | - Carlos Ginés
- Departamento
de Química Inorgánica, Orgánica y Bioquímica-Centro
de Innovación en Química Avanzada (ORFEO-CINQA), Facultad
de Ciencias y Tecnologías Químicas, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain
| | - David Elorriaga
- Departamento
de Química Orgánica e Inorgánica, Universidad de Oviedo, Julián Clavería 8, 33006 Oviedo, Spain
| | - Fernando Carrillo-Hermosilla
- Departamento
de Química Inorgánica, Orgánica y Bioquímica-Centro
de Innovación en Química Avanzada (ORFEO-CINQA), Facultad
de Ciencias y Tecnologías Químicas, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain
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2
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Ota K, Kinjo R. A Crystalline B 4N 2 Dewar Benzene as a Building Block for Conjugated B,N-Chains. J Am Chem Soc 2021; 143:11152-11159. [PMID: 34264664 DOI: 10.1021/jacs.1c04860] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Dewar benzene, one of the isolable valence isomers of C6H6, has been extensively studied since its first synthesis in 1962. By contrast, the chemistry of inorganic congeners of Dewar benzene, which can be formally gained by replacing the skeletal carbon atoms with heteroatoms, has been less developed despite their peculiar structural and electronic features. Among them, the extant B,N-Dewar benzenes are limited to the B3N3 system. Herein, we report the development of the first example of an isolable B4N2 Dewar benzene, 3. As predicted by DFT calculations, a judicious selection of the substituents allows synthesizing 3. Single-crystal X-ray analysis, NMR, and computational studies confirmed that 3 possesses a high-lying B(sp3)-B(sp3) σ-bond at the bridgehead position. Reactions with ethylene and phenylacetylene proceeded smoothly under mild conditions, affording the fused B4C4N2 ring systems (4 and 5). Structural characterization as well as DFT calculations revealed that compounds 4 and 5 involve a rigid and conjugated (BN)4 tetraene scaffold. Formation of 4 and 5 demonstrates that 3 may serve as a building block for the construction of conjugated B,N-chains.
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Affiliation(s)
- Kei Ota
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
| | - Rei Kinjo
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
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3
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Rojas RS, Muñoz-Becerra K, Toro-Labbé A, Mesías-Salazar A, Martínez I, Antiñolo A, Carrillo-Hermosilla F, Fernández-Galán R, Ramos A, Daniliuc CG. New guanidine-borane adducts: An experimental and theoretical approach. Inorganica Chim Acta 2021. [DOI: 10.1016/j.ica.2020.120217] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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4
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Huergo E, Fernández-Galán R, Ramos A, Antiñolo A, Carrillo-Hermosilla F, Rodríguez-Diéguez A, García-Vivó D. Reactivity of N-Phosphinoguanidines of the Formula (HNR)(Ph 2PNR)C(NAr) toward Main Group Metal Alkyls: Facile Ligand Rearrangement from N-Phosphinoguanidinates to Phosphinimine-Amidinates. Inorg Chem 2020; 59:15262-15275. [PMID: 33002356 DOI: 10.1021/acs.inorgchem.0c02224] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report the reactivity of N-phosphinoguanidines of the formula (HNR)(Ph2PNR)C(NAr) (R = iPr and Ar = 2,6-iPr2C6H3 [Dipp] for 1a, R = iPr and Ar = 2,4,6-Me3C6H2 [Mes] for 1b, and R = Cy and Ar = Dipp for 1c), prepared in high yields from the corresponding trisubstituted guanidines, toward main group metal alkyls AlMe3, ZnEt2, MgnBu2, and nBuLi to obtain novel phosphinoguanidinato and phosphinimine-amidinato compounds. Reactions of 1a-c with AlMe3 at room temperature led to the kinetic phosphinoguanidinato products [Al{κ2-N,N'-(NR)C(NAr)(NRPPh2)}Me2] (2a-c), whereas the mild heating (60-80 °C) of solutions of 2a-c give the thermodynamic phosphinimine-amidinato products [Al{κ2-N,N'-(NR)C(NAr)(PPh2NR)}Me2] (3a-c) after ligand rearrangement. The reactions of equimolar amounts of 1a-c and ZnEt2 initially give solutions containing unstable phosphinoguanidinato compounds [Zn{κ2-N,P-(NR)C(NAr)(NRPPh2)}Et] (4a-c), which rearrange upon mild heating to the phosphinimine-amidinato derivatives [Zn{κ2-N,N'-(NR)C(NAr)(PPh2NR)}Et] (6a-c). Bis(phosphinoguanidinato) compounds [Zn{κ2-N,P-(NR)C(NAr)(NRPPh2)}2] (5a-c) can be obtained under mild conditions (<45 °C) in THF, whereas bis(phosphinimine-amidinato) compounds [Zn{κ2-N,N'-(NR)C(NAr)(PPh2NR)}2] (7a-c) are also accessible under more forcing conditions (55-100 °C) from (i) ZnEt2 and 1b,c (2 equiv), (ii) 6a and 1a, or (iii) 5b,c. Equimolar mixtures of MgnBu2 and 1a-c in THF at room temperature give unstable phosphinimine-amidinato monoalkyl products [Mg{κ2-N,N'-(NR)C(NAr)(PPh2NR)}nBu(THF)2] (8a-c), whereas 2 equiv of 1a,b are required to reach the bischelate compounds [Mg{κ2-N,N'-(NiPr)C(NAr)(PPh2NiPr)}2] (9a,b). Finally, phosphinoguanidinato compounds [Li{κ2-N,P-(NR)C(NDipp)(NRPPh2)}(THF)2] (10a,c) were obtained in the reactions of 1a,c with nBuLi in THF under ambient conditions. The removal of the solvent from solutions of 10a,c under partial vacuum leads to the dinuclear compounds [Li2{μ-κ2-N,N':κ1-N-(NR)C(NDipp)(NRPPh2)}2(THF)2] (11a,c) after the decoordination of one of the THF molecules in 10a,c and dimerization. Heating solutions of 10a,c at 60 °C triggers ligand rearrangement to give phosphinimine-amidinato compounds [Li{κ2-N,N'-(NR)C(NDipp)(PPh2NR)}(THF)2] (12a,c). We also propose a mechanism for the ligand rearrangement reaction from 10a to give 12a, supported by DFT calculations, which fits nicely with our experimental results. It essentially involves a carbodiimide deinsertion reaction followed by a [3 + 2] cycloaddition between the resulting lithium phosphino-amide and the carbodiimide.
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Affiliation(s)
- Estefanía Huergo
- Departamento de Quı́mica Inorgánica, Orgánica y Bioquı́mica-Centro de Innovación en Quı́mica Avanzada (ORFEO-CINQA), Universidad de Castilla-La Mancha, Campus Universitario, E-13071 Ciudad Real, Spain
| | - Rafael Fernández-Galán
- Departamento de Quı́mica Inorgánica, Orgánica y Bioquı́mica-Centro de Innovación en Quı́mica Avanzada (ORFEO-CINQA), Universidad de Castilla-La Mancha, Campus Universitario, E-13071 Ciudad Real, Spain
| | - Alberto Ramos
- Departamento de Quı́mica Inorgánica, Orgánica y Bioquı́mica-Centro de Innovación en Quı́mica Avanzada (ORFEO-CINQA), Universidad de Castilla-La Mancha, Campus Universitario, E-13071 Ciudad Real, Spain
| | - Antonio Antiñolo
- Departamento de Quı́mica Inorgánica, Orgánica y Bioquı́mica-Centro de Innovación en Quı́mica Avanzada (ORFEO-CINQA), Universidad de Castilla-La Mancha, Campus Universitario, E-13071 Ciudad Real, Spain
| | - Fernando Carrillo-Hermosilla
- Departamento de Quı́mica Inorgánica, Orgánica y Bioquı́mica-Centro de Innovación en Quı́mica Avanzada (ORFEO-CINQA), Universidad de Castilla-La Mancha, Campus Universitario, E-13071 Ciudad Real, Spain
| | - Antonio Rodríguez-Diéguez
- Departamento de Quı́mica Inorgánica, Facultad de Ciencias, Universidad de Granada, Avenida de la Fuente Nueva S/N, 18071 Granada, Spain
| | - Daniel García-Vivó
- Departamento de Quı́mica Orgánica e Inorgánica/IUQOEM, Universidad de Oviedo, E-33071 Oviedo, Spain
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5
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Fırıncı E, Fırıncı R, Sevinçek R, Aygün M, Şahin Y. Neutral cyclic sp 2-sp 3 and sp 3-sp 3 diboranes from N, N'-dicyclohexylcarbodiimide insertion into 1,2-dichlorodiboranes(4). Chem Commun (Camb) 2020; 56:9807-9810. [PMID: 32706012 DOI: 10.1039/d0cc03454a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
We report the synthesis and structural characterization of new neutral cyclic sp2-sp3 and sp3-sp3 diboranes from the reaction of N,N'-dicyclohexylcarbodiimide with 1,2-dichlorodiboranes(4) at room temperature. The present study is the first example of an insertion reaction of carbodiimide into diborane(4).
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Affiliation(s)
- Erkan Fırıncı
- Department of Chemistry, Science and Art Faculty, Aydın Adnan Menderes University, Aydın, Turkey.
| | - Rukiye Fırıncı
- Department of Chemistry, Science and Art Faculty, Aydın Adnan Menderes University, Aydın, Turkey.
| | - Resul Sevinçek
- Department of Physics, Science Faculty, Dokuz Eylül University, İzmir, Turkey
| | - Muhittin Aygün
- Department of Physics, Science Faculty, Dokuz Eylül University, İzmir, Turkey
| | - Yüksel Şahin
- Department of Chemistry, Science and Art Faculty, Aydın Adnan Menderes University, Aydın, Turkey.
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Wang Y, Zhang WX, Xi Z. Carbodiimide-based synthesis of N-heterocycles: moving from two classical reactive sites to chemical bond breaking/forming reaction. Chem Soc Rev 2020; 49:5810-5849. [PMID: 32658233 DOI: 10.1039/c9cs00478e] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Carbodiimides are a unique class of heterocumulene compounds that display distinctive chemical properties. The rich chemistry of carbodiimides has drawn increasing attention from chemists in recent years and has made them exceedingly useful compounds in modern organic chemistry, especially in the synthesis of N-heterocycles. This review has outlined the extensive application of carbodiimides in the synthesis of N-heterocycles from the 1980s to today. A wide range of reactions for the synthesis of various types of N-heterocyclic systems (three-, four-, five-, six-, seven-, larger-membered and fused heterocycles) have been developed on the basis of carbodiimides and their derivatives.
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Affiliation(s)
- Yang Wang
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China. and Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology (QNLM), Qingdao 266237, China
| | - Wen-Xiong Zhang
- Beijing National Laboratory for Molecular Sciences, MOE Key Laboratory of Bioorganic Chemistry and Molecular Engineering, College of Chemistry, Peking University, Beijing 100871, China.
| | - Zhenfeng Xi
- Beijing National Laboratory for Molecular Sciences, MOE Key Laboratory of Bioorganic Chemistry and Molecular Engineering, College of Chemistry, Peking University, Beijing 100871, China.
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7
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Fernández-Galán R, Ramos A, Huergo E, Antiñolo A, Carrillo-Hermosilla F, Rodríguez-Diéguez A, García-Vivó D. Unusual ligand rearrangement: from N-phosphinoguanidinato to phosphinimine-amidinato compounds. Chem Commun (Camb) 2019; 55:2809-2812. [PMID: 30761391 DOI: 10.1039/c9cc00432g] [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
Novel N-phosphinoguanidines (HNiPr)(Ph2PNiPr)C(NAr) (Ar = 2,6-iPr2C6H3, 2,4,6-Me3C6H2) react with AlMe3 to afford phosphinimine-amidinato derivatives, via an unprecedented rearrangement of an initial N-phosphinoguanidinato intermediate. A reasonable mechanism has been proposed for this transformation, supported by DFT calculations, involving carbodiimide de-insertion followed by a [3+2] cycloaddition.
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Affiliation(s)
- Rafael Fernández-Galán
- Centro de Innovación en Química Avanzada (ORFEO-CINQA), Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Ciencias y Tecnologías Químicas, Universidad de Castilla-La Mancha, Campus Universitario, E-13071 Ciudad Real, Spain.
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8
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Moreno S, Ramos A, Carrillo-Hermosilla F, Rodríguez-Diéguez A, García-Vivó D, Fernández-Galán R, Antiñolo A. Selective Three-Component Coupling for CO 2 Chemical Fixation to Boron Guanidinato Compounds. Inorg Chem 2018; 57:8404-8413. [PMID: 29949350 DOI: 10.1021/acs.inorgchem.8b01068] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A selective three-component coupling was employed to fix carbon dioxide to boron guanidinato compounds. The one-pot reaction of carbon dioxide, carbodiimides, and borylamines (ArNH)BC8H14 afforded the corresponding 1,2-adducts {R(H)N}C{N(Ar)}(NR)(CO2)BC8H14. Alternatively, the reaction with p-MeOC6H4NC or 2,6-Me2C6H3NC gave the corresponding isocyanide 1,1-adducts { i-PrHN}C{N(p-Me-C6H4)}(N i-Pr){CNAr}BC8H14. The molecular structures of products (2,6- i-Pr2C6H3NH)BC8H14 7, { i-Pr(H)N}C{N(p-MeC6H4)}(N i-Pr)(CO2)BC8H14 9, {Cy(H)N}C{N( p-MeC6H4)}(Cy)(CO2)BC8H14 13, and { i-PrHN}C{N( p-MeC6H4)}(N i-Pr){CNR″}BC8H14 (R″ = p-MeOC6H4, 2,6-Me2C6H3) 14 and 15 were established by X-ray diffraction. Density functional theory calculations at the M05-2X level of theory revealed that CO2 fixation and formation of the corresponding adduct is exothermic and proceeds via a nonchelate boron guanidinato intermediate.
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Affiliation(s)
- Sonia Moreno
- Departamento de Química Inorgánica, Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA) , Universidad de Castilla-La Mancha , Campus Universitario , E-13071 Ciudad Real , Spain
| | - Alberto Ramos
- Departamento de Química Inorgánica, Orgánica y Bioquímica , Instituto Regional de Investigación Científica Aplicada, Universidad de Castilla-La Mancha , Campus Universitario , E-13071 Ciudad Real , Spain
| | - Fernando Carrillo-Hermosilla
- Departamento de Química Inorgánica, Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA) , Universidad de Castilla-La Mancha , Campus Universitario , E-13071 Ciudad Real , Spain
| | - Antonio Rodríguez-Diéguez
- Departamento de Química Inorgánica, Facultad de Ciencias , Universidad de Granada , Avenida de la Fuente Nueva S/N , 18071 Granada , Spain
| | - Daniel García-Vivó
- Departamento de Química Orgánica e Inorgánica/IUQOEM , Universidad de Oviedo , E-33071 Oviedo , Spain
| | - Rafael Fernández-Galán
- Departamento de Química Inorgánica, Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA) , Universidad de Castilla-La Mancha , Campus Universitario , E-13071 Ciudad Real , Spain
| | - Antonio Antiñolo
- Departamento de Química Inorgánica, Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA) , Universidad de Castilla-La Mancha , Campus Universitario , E-13071 Ciudad Real , Spain
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9
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Ramos A, Antiñolo A, Carrillo-Hermosilla F, Fernández-Galán R, Montero-Rama MDP, Villaseñor E, Rodríguez-Diéguez A, García-Vivó D. Insertion reactions of small unsaturated molecules in the N-B bonds of boron guanidinates. Dalton Trans 2017; 46:10281-10299. [PMID: 28737819 DOI: 10.1039/c7dt02081c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report here 1,1- and 1,2-insertion reactions of small unsaturated molecules in the N-B bonds of two boron guanidinates, (Me2N)C(NiPr)2BCy2 (1) and {iPr(H)N}C(NiPr){N(p-tBu-C6H4)}BCy2 (2), and two bisboron guanidinates(2-), {iPr(BCy2)N}C(NiPr){N(p-tBu-C6H4)}BCy2 (3) and {iPr(C8H14B)N}C(NiPr){N(p-Me-C6H4)}BC8H14 (4), the latter being prepared for the first time by double deprotonation of the corresponding guanidine with the 9-borabicyclo[3.3.1]nonane dimer, (H-BC8H14)2. Compounds 1-4 easily insert aromatic isonitriles, XylNC (Xyl = 2,6-Me2-C6H3) and (p-MeO-C6H4)NC, to give the expected diazaboroles 5-12, some of them being structurally characterised by X-ray diffraction. Interestingly, the BC8H14 derivatives 11 and 12 are in a fast temperature-dependent equilibrium with the de-insertion products, whose thermodynamic parameters are reported here. A correlation between these equilibria and the puckered heterocyclic structure found in the solid state for 11, and confirmed by DFT calculations, is also established. Reactions of the aforementioned guanidinates with CO are more sluggish or even precluded, and only one product, {iPr(H)N}C{N(p-tBu-C6H4)}(NiPr)(CO)BCy2 (13), could be isolated in moderate yields. The 1,2-insertions of benzaldehyde in compounds 1, 2 and 4 are reversible reactions in all cases, and only one of the insertion products, {iPr(H)N}C{N(p-tBu-C6H4)}(NiPr)(PhHCO)BCy2 (16a), was isolated and diffractrometrically characterised. Likewise, CO2 reversibly inserts into a N-B bond of 2 to give {iPr(H)N}C{N(p-tBu-C6H4)}(NiPr)(CO2)BCy2 (19) with a conversion of ca. 9%. In all these equilibria, de-insertion is always favoured upon increasing the temperature.
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Affiliation(s)
- Alberto Ramos
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Instituto Regional de Investigación Científica Aplicada, Universidad de Castilla-La Mancha, Campus Universitario, E-13071 Ciudad Real, Spain.
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10
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Geier SJ, LaFortune JHW, Zhu D, Kosnik SC, Macdonald CLB, Stephan DW, Westcott SA. The phosphinoboration of carbodiimides, isocyanates, isothiocyanates and CO2. Dalton Trans 2017; 46:10876-10885. [DOI: 10.1039/c7dt02305g] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The transition metal-free addition of phosphinoboronate ester Ph2PBpin (pin = 1,2-O2C2Me4) to heterocumulenes including carbodiimides, isocyanates, isothiocyanates and carbon dioxide proceeds with remarkable selectivity to give products in high yield.
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Affiliation(s)
- Stephen J. Geier
- Department of Chemistry and Biochemistry
- Mount Allison University
- Sackville
- Canada
| | | | - Diya Zhu
- Department of Chemistry and Biochemistry
- Mount Allison University
- Sackville
- Canada
- Department of Chemistry
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