Ir(I)/HCl Catalyzed Head-to-Tail Homocoupling Reactions of Vinylsilanes
摘要:
Novel homocoupling reactions of vinylsilanes, catalyzed by a mixture of NI) and HCl, were developed. This process leads to exclusive formation of head-to-tail vinylsilane dimers in high yields at room temperature. Synthetic attributes of transformations of the resulting head-to-tail vinylsilane dimers and polymerization of bis(vinylsilane) were investigated.
Generation of a Silylethylene−Titanium Alkoxide Complex. A Versatile Reagent for Silylethylation and Silylethylidenation of Unsaturated Compounds
作者:Ryo Mizojiri、Hirokazu Urabe、Fumie Sato
DOI:10.1021/jo000925x
日期:2000.9.1
(Trimethylsilyl)ethylene-titanium alkoxide complex (1) was generated from trimethyl(vinyl)silane, Ti(O-i-Pr)(4), and i-PrMgCl as a preformed alkene-titanium complex and reacted with several unsaturated compounds such as aldehyde, imine, other vinylsilane, and acetylene to give the corresponding coupling products 4a-f, 6, 8, and 10a-d in a regioselective manner. Both of the two carbon-titanium bonds
The interaction of butadiene with trimethylvinylsilane over a nickel chloride catalytic system in the presence of an organoaluminum Lewis acid and triphenylphosphine proceeds by telomerization and results in the formation of telomer homologs of general formula (CH3CHCHCH2)nCSi(CH3)3CH2, n = 1–5. The reaction is accompanied by the formation of a dimer of trimethylvinylsilane 2,4-bis(trimethylsilyl)-1-butene