coupling of bis(phenylthio)methyltributylstannane with alcohols. The dithioorthoformates thus prepared are useful precursors for alkoxymethylidene complexes of titanium, which transform carbonylcompounds into a variety of enolethers. Even the alkoxymethylidene complexes having a terminal olefin moiety can be prepared and employed for carbonyl olefination without formation of ring-closing metathesis
Titanocene(II)-promoted olefination of various carbonyl compounds using 1,1-bis(phenylthio)-2-triorganosilylethanes gave allylsilanes in good yields. γ-Alkoxy and alkylthio group substituted allylsilanes were also obtained by using carboxylic esters and thiolesters, respectively.
The reaction of thiolesters with titanocene alkylidenes prepared by the treatment of thioacetals with the low valent titanium species Cp2Ti[P(OEt)3]2 produced the corresponding alkenyl sulfides in good yields with moderate to good Z stereoselectivity.
硫醇酯与通过用低价钛物质 Cp2Ti[P(OEt)3]2 处理硫代缩醛制备的二茂钛亚烷基反应,以良好的收率和中等至良好的 Z 立体选择性产生相应的烯基硫化物。