A new, simple preparation for stable dialkyl ketenes involving intramolecular dehydration of appropriately substituted acetic acids with dicyclohexylcarbodiimide (DCC) in the presence of catalytic amounts of triethylamine gives 60-70% yield of the corresponding ketenes. Trimethylsilylacetic acid also gives trimethylsilylketene in good yield.
一种新的、简单的稳定二烷基烯酮制备方法涉及在催化量的
三乙胺存在下,用二环己基碳二
亚胺(
DCC)对适当取代的
乙酸进行分子内脱
水,可得到 60-70% 收率的相应烯酮。三甲基
硅基
乙酸也能以良好的收率生成三甲基
硅基烯酮。