Phase transfer catalytically generated chlorofluorocarbene adds to alkynes much more readily than dichlorocarbene. Some sterically shielded or critically substituted compounds that do not give addition with CCl2 can be reacted with CClF. Chlorofluorocyclopropenes thus formed are hydrolyzed to cyclopropenones in situ. Hitherto unknown α-oxygen functional cyclopropenones were also prepared for the first
相转移催化生成的
氯氟卡宾比二
氯卡宾更容易添加
炔烃。某些不与CCl 2加成的空间屏蔽或临界取代的化合物可以与CClF反应。由此形成的
氯氟环
丙烯原位
水解为
环丙烯酮。迄今为止,还首次制备了未知的α-氧官能
环丙烯酮。然而,分离α-羰基取代的
环丙烯酮的尝试失败了:显然,吸电子基团使半芳族体系不稳定。