C-Halophosphaalkenes: Probing the range of stability and reactivity towards bromine
作者:S.J. Goede、M.A. Dam、F. Bickelhaupt
DOI:10.1002/recl.19941130503
日期:——
The importance of steric protection for the stability of phosphaalkenes RP=CI2 (6) was investigated by varying the size of group R. The phosphaalkene IsP=CI2 (6b) (Is = 2,4,6-triisopropylphenyl) could be prepared in 15% isolated yield by reaction of IsPCl2 and HCI3 with two equivalents of lithium diisopropylamide, in analogy to the synthesis of the stable, sterically more protected, Mes*P = CI2 (6a)
通过改变基团R的大小,研究了空间保护对磷烯烃RP = CI 2(6)稳定性的重要性。可以制备磷烯烃IsP = CI 2(6b)(Is = 2,4,6-三异丙基苯基)通过IsPCl 2和HCl 3与两当量的二异丙基氨基锂反应,可得到15%的分离收率,类似于稳定的,在空间上更受保护的Mes * P = CI 2(6a)(Mes * = 2,4, 6-三叔丁基苯基)。如果对磷的空间保护作用进一步降低(R = Es = 2,4,6-三乙基苯基,R = Mes = 2,4,6-三甲基苯基),则取代产物RP(Cl)N(Pr i)除了热不稳定的磷烯烃EsP = CI 2(6c)和MesP = CI 2(6d)以外,还形成了2种(R = Es(9c)或Mes(9d))作为主要产物。的结构图9c-d分别由从RPCL独立合成证实2和二异丙基胺的两个当量。