Gas-phase determination of the geometric requirements of the silicon .beta.-effect. Photoelectron and Penning ionization electron spectroscopic study of silylthiiranes and -oxiranes. Synthesis and chemistry of trans-2,3-bis(trimethylsilyl)thiirane
Vinylidene Homologation of Boronic Esters and its Application to the Synthesis of the Proposed Structure of Machillene
作者:James M. Fordham、Matthew N. Grayson、Varinder K. Aggarwal
DOI:10.1002/anie.201907617
日期:2019.10.21
Herein, we report that these valuable products can be accessed by the homologation of boronic esters with lithiated epoxysilanes. Aliphatic and electron-rich aromatic boronic esters provided vinylidene boronic esters in moderate to high yields, while electron-deficient aromatic and vinyl boronic esters were found to give the corresponding vinyl silane products. Through DFT calculations, this divergence
Organosilicon compounds with functional groups proximate to silicon
作者:John J. Eisch、James E. Galle
DOI:10.1016/0022-328x(88)89085-5
日期:1988.3
(OEt)2PO and Ph; the groups R and R′ were H, Ph and n-C6H13; and the lithiating reagents were n-butyllithium, t-butyllithium and lithium diisopropylamide in donor media of THF or TMEDA. The lithiation occurs with retention of configuration and the resulting lithio-epoxide is unstable above 0°C, decomposing in a carbenoid manner. The lithiation is facile except for compounds where Z and R (an alkyl
Molybdenum(II) acetate dimer or titanium(IV) i-propoxide induced regiospecific ring cleavage of α,β-epoxysilanes to form the enolate intermediates, which reacted with aldehydes to give the corresponding α,β-unsaturated carbonyl compounds.
The reaction of trimethylsilyl ethylene oxide with α-sulfonyl anions and α,α-sulfonyl dianions. A method for stereocontrolled synthesis of (E)- and (Z)-allylic alcohols
and expulsion of the benzenosulfonyl anion. The reaction of trimethylsilyl ethylene oxide with α,α-sulfonyl dianions followed by partial protonation of the immediate adducts affords O-trimethylsilyl allylic alcohols, mainly (E)-isomers. The reaction of trimethylsilyl ethylene oxide with α-sulfonylcarbanions generated from secondary alkyl phenyl sulfones affords α-trimethylsilyl carbinols as the only
Synthesis of (+)-disparlure using the reaction of 6-methylheptyl phenyl sulphone with trimethylsilyl ethylene oxide and asymmetric epoxidation
作者:Stanisław Marczak、Marek Masnyk、Jerzy Wicha
DOI:10.1016/s0040-4039(00)99140-8
日期:1989.1
Lithiated sulphone was reacted with trimethyl(oxiranyl)silane to yield allylic alcohol ; the latter was epoxidized by the Sharpless procedure and the corresponding hydroxy-epoxide was transformed into (+)-disparlure tosylate .