Catalytic and Stoichiometric Reactivity of β-Silylamido Agostic Complex of Mo: Intermediacy of a Silanimine Complex and Applications to Multicomponent Coupling
作者:Andrey Y. Khalimon、Razvan Simionescu、Georgii I. Nikonov
DOI:10.1021/ja111005r
日期:2011.5.11
reaction of complex (ArN═)(2)Mo(PMe(3))(3) (Ar = 2,6-diisopropylphenyl) with PhSiH(3) gives the β-agostic NSi-H···M silyamido complex (ArN═)Mo(SiH(2)Ph)(PMe(3))(η(3)-ArN-SiHPh-H) (3) as the first product. 3 decomposes in the mother liquor to a mixture of hydride compounds, including complex η(3)-SiH(Ph)-N(Ar)-SiHPh-H···}MoH(3)(PMe(3))(3) characterized by NMR. Compound 3 was obtained on preparative scale
Peterson, Erik; Khalimon, Andrey Y.; Simionescu, Razvan, Journal of the American Chemical Society, 2009, vol. 131, p. 908 - 909
作者:Peterson, Erik、Khalimon, Andrey Y.、Simionescu, Razvan、Kuzmina, Lyudmila G.、Howard, Judith A. K.、Nikonov, Georgii I.
DOI:——
日期:——
An Unexpected Mechanism of Hydrosilylation by a Silyl Hydride Complex of Molybdenum
作者:Andrey Y. Khalimon、Stanislav K. Ignatov、Razvan Simionescu、Lyudmila G. Kuzmina、Judith A. K. Howard、Georgii I Nikonov
DOI:10.1021/ic201550a
日期:2012.1.16
Carbonyl hydrosilylationcatalyzed by (ArN)Mo(H)(SiH2Ph)(PMe3)(3) (3) is unusual in that it does not involve the expected Si-O elimination from intermediate (ArN)Mo(SiH2Ph)((OPr)-Pr-i)(PMe3)(2) (7). Instead, 7 reversibly transfers beta-CH hydrogen from the alkoxide ligand to metal.
Mononuclear Heteroscorpionate Zwitterionic Zinc Terminal Hydride: Synthesis, Reactivity, and Catalysis for Hydrosilylation of Aldehydes
作者:Zehuai Mou、Hongyan Xie、Meiyan Wang、Na Liu、Changguang Yao、Lei Li、Jingyao Liu、Shihui Li、Dongmei Cui
DOI:10.1021/acs.organomet.5b00413
日期:2015.8.24
Treatment of heteroscorpionate zinc benzyloxy complex LZnOBn (1, L = ((Me)Pz)(2)CP(Ph)(2)NPh, (Me)Pz = 3,5-dimethylpyrazolyl) with phenylsilane (PhSiH3) gave a zinc hydride complex LZnH (2) containing a rare terminal hydride fragment. X-ray diffraction analysis and the DFT calculation confirm the zwitterionic structure of complex 2. The stoichiometric reaction of 2 with CS2 readily afforded a dithioformate complex LZnSCH(S) (3) of the C=S insertion into the Zn-H product. Moreover, complex 2 was an efficient catalyst for the hydrosilylation reaction of a series of silanes and aldehydes under mild conditions, featuring excellent functional group tolerance. The preliminary mechanistic study revealed that both zinc benzyloxy complex 1 and zinc hydride complex 2 were involved in the hydrosilylation process as the reaction intermediates.
Unusual Structure, Fluxionality, and Reaction Mechanism of Carbonyl Hydrosilylation by Silyl Hydride Complex [(ArN)Mo(H)(SiH<sub>2</sub>Ph)(PMe<sub>3</sub>)<sub>3</sub>]
作者:Andrey Y. Khalimon、Stanislav K. Ignatov、Andrey I. Okhapkin、Razvan Simionescu、Lyudmila G. Kuzmina、Judith A. K. Howard、Georgii I. Nikonov
DOI:10.1002/chem.201300376
日期:2013.6.24
hydride derivatives [(RN)Mo(H)(SiR′3)(PMe3)3] (3: R=Ar, R′3=H2Ph; 8: R=Ar′, R′3=H2Ph; 9: R=Ar, R′3=(OEt)3; 10: R=Ar, R′3=HMePh). These compounds can also be conveniently prepared by reacting [(RN)Mo(H)(Cl)(PMe3)3] with one equivalent of LiBH4 in the presence of a silane. Complex 3 undergoes intramolecular and intermolecular phosphine exchange, as well as exchange between the silyl ligand and the free