Epoxide formation by sulphur y1id insertion into aldehydes under heterogeneous conditions in the presence of small quantities of water is described. Trimethylsulphonium and S-methylthiolanium bromide and iodide have been studied. For all alkyl substituents the bromide gives better results than the iodide, this is interpreted in terms of the reaction mechanism. Under optimum conditions high yields of
描述了在少量
水的存在下,在非均相条件下通过
硫化合物插入醛中形成的
环氧化物。已经研究了三甲基s和S-甲基
硫基
溴化铵和
碘化物。对于所有的烷基取代基,
溴化物比
碘化物具有更好的结果,这是根据反应机理来解释的。在最佳条件下,可获得高收率的
环氧化物。