In the reaction with nucleophiles of the type M′[M(CO)2C5R5] (M′ Na, K; M Fe, Ru; R H, CH3), the pentamethylcyclopentadienyl (Cp★) ligand in the known diphosphenes Cp★PPMes★ and Cp★PPCp★, and in the arsaphosphene Cp★AsPMes★ acts as a nucleofugal leaving group. This behaviour opens an alternative synthetic route to transition-metal substituted diphosphenes, arsaphosphenes, and tetraphospha-bicyclobutanes
在与M'[M(CO)2 C 5 R 5 ](M'Na,K;MFe,Ru;RH,CH 3)类型的亲核试剂反应中,五
甲基环戊二烯基(Cp★)
配体在已知的
二膦Cp★PPMes★和Cp★PPCp★中,以及在亚
磷phosphCp★AsPMes★中充当核真菌离去基团。此行为为过渡
金属取代的
二膦,亚
砷膦和四
磷-双
环丁烷开辟了另一条合成途径。