Regioselective Hydrosilylation of Olefins Catalyzed by a Molecular Calcium Hydride Cation
作者:Danny Schuhknecht、Thomas P. Spaniol、Laurent Maron、Jun Okuda
DOI:10.1002/anie.201909585
日期:2020.1.2
Chemo- and regioselectivity are often difficult to control during olefin hydrosilylation catalyzed by d- and f-block metal complexes. The cationichydride of calcium [CaH]+ stabilized by an NNNNmacrocycle was found to catalyze the regioselective hydrosilylation of aliphatic olefins to give anti-Markovnikov products, while aryl-substituted olefins were hydrosilyated with Markovnikov regioselectivity
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
the silyl compounds with a (2,2-diphenylcyclopropyl)methyl substituent in moderate to high yields without ring-opening of the substrate. PtI(2)(PPh(3))(2) is converted by the reaction into PtH(I)(PPh(3))(2), which also catalyzes the hydrosilylation of the methylenecyclopropanes. The reaction of 2-phenyl-1-methylenecyclopropane, 2-methyl-2-phenyl-1-methylenecyclopropane, 2,2-diphenethyl-1-methylenecyclopropane
Thermodynamic <i>versus</i> kinetic control in substituent redistribution reactions of silylium ions steered by the counteranion
作者:Lukas Omann、Bimal Pudasaini、Elisabeth Irran、Hendrik F. T. Klare、Mu-Hyun Baik、Martin Oestreich
DOI:10.1039/c8sc01833b
日期:——
theoretical study of the substituent exchange reaction of silyliumions is presented. Apart from the substitution pattern at the silicon atom, the selectivity of this process is predominantly influenced by the counteranion, which is introduced with the trityl salt in the silyliumion generation. In contrast to Müller's protocol for the synthesis of triarylsilylium ions under kinetic control, the use of Reed's
Geometrically Constrained Cationic Low‐Coordinate Tetrylenes: Highly Lewis Acidic σ‐Donor Ligands in Catalytic Systems
作者:Philip M. Keil、Terrance J. Hadlington
DOI:10.1002/anie.202114143
日期:2022.2.14
In stark contrast to poorly electrophilic classical σ-donating spectator ligands, we show that geometricallyconstrained low-coordinate, cationic GeII and SnII ligands remain highly electrophilic in the coordination sphere of Ni0, despite being σ-donors; binding of nucleophiles and fluoride abstraction at the donor atom is demonstrated, alongside the capacity to catalyse the hydrosilylation of alkenes