Yg. Zhou et al., STEREOCONTROLLED SYNTHESIS OF EITHER TRANS-TRIMETHYLSILYLVINYLOXIRANES OR CIS-TRIMETHYLSILYLVINYLOXIRANES VIA SULFONIUM YLIDES, Chemical communications, (11), 1996, pp. 1353-1354
trans- or cis-beta-Trimethylsilylvinyloxiranes are prepared by the rea
ction of aldehydes with a 3-trimethylsilylated dimethylsulfonium allyl
ide under phase-transfer conditions or with a preformed 3-trimethylsil
ylated diphenylsulfonium allylide in the presence of LiBr, both in exc
ellent yields and high stereoselectivity.