iodosobenzene in the presence of acetic anhydride. Thermal and Cu-catalyzed decomposition of iodonium ylides can be differentiated and both are explained in terms of diacylcarbene intermediate with different multiplicity. For the sake of comparison diazodimedone and related compounds are also decomposed by Cu-catalysis as well as by photochemical reaction. Carbene is also found to be a highly probable
碘鎓叶立德的制备方法 Ph–\overset⊕I–\overset\ominusC(COR)(COR') 通过活性亚甲基化合物 H2C(COR)(COR') 与
碘苯在
醋酸酐。
碘鎓叶立德的热和
铜催化分解可以区分,两者都可以用具有不同多样性的二酰基卡宾中间体来解释。为了比较,重氮
二甲酮和相关化合物也可通过
铜催化和光
化学反应分解。还发现卡宾是一种很有可能的中间体。在这些研究中,卡宾的自旋多重性是在产物分布的基础上讨论的。值得注意的是,在
乙醇中存在均相 Cu 催化剂的情况下,重氮
二甲酮会产生 O-H 键的插入产物,2-乙氧基-3-羟基-5,5-二甲基-2-
环己烯酮(XVII),而
碘鎓叶立德不产生这种化合物。XVII的形成通过假设酮卡宾-Cu-螯合物来解释。