Treatment of pentafluorophenyltrimethylsilane (I) with enolizable ketones in the presence of a catalytic amount of potassium cyanide-18-crown-6 complex gave the corresponding trimethylsilyl enol ethers. The same dehydrogenative silylation of highly crowded 2,4,6-trimethylacetophenone with silane I or with Me3SiCN was extended to the preparation of 1′-(2,4,6-trimethylstyryl)oxytrimethylsilane (XII)
在催化量的
氰化钾-
18-冠-6配合物的存在下,用可烯丙基化的酮处理
五氟苯基三甲基
硅烷(I),得到相应的三甲基甲
硅烷基烯醇醚。高度拥挤的2,4,6-三甲基
苯乙酮与
硅烷I或与Me 3 SiCN的相同脱氢甲
硅烷基化反应扩展到了1'-(
2,4,6-三甲基苯乙烯基)氧基三甲基
硅烷(XII)的制备。另一方面,
氰化钾-
18-冠-6配合物催化将
硅烷I或Me 3 SiCN加到不可烯化的酮(如α,α,α-三
氟苯乙酮)的羰基上。