been shown that different products are formed with this species depending on the specific structure of olefin. The 1,1-disubstituted olefins afforded mostly α,β-unsaturated carbonyl compounds. The sterically encumbered tri- or tetrasubstituted olefins yielded 1,2- or 1,4-dihydroxylated products, presumably via four-membered cyclic intermediates.
研究了一种新的烯烃氧化体系,该体系由苯
硒酸酐和三甲基甲
硅烷基
三氟甲磺酸酯组成。推测在这些条件下形成了高反应性的苯
硒烯基阳离子。已经表明,取决于烯烃的具体结构,与该物质形成不同的产物。1,1-二取代的烯烃主要提供α,β-不饱和羰基化合物。在空间上受阻的三或四取代的烯烃产生了1,2-或1,4-二羟基化的产物,大概是通过四元环状中间体。