Opening of phosphirane-tungsten-complexes by nucleophiles

摘要: Abstract The reactions of two phosphirane P-W(CO) 5 complexes with nitrogen, oxygen, phosphorus and sulphur nucleophiles have been studied. Except when the nucleophile is too bulky,the initial attack takes place at phosphorus. In this case, main reaction paths observed: first one a ring opening giving carbanion which may be protonated, or can react W(CO) group to yield cyclic Fischer carbene complex. second path, whole carbon-carbon unit three-membered lost final products formally result from addition onto phosphinidene [RP→W(CO) ]. Nitrogen oxygen tend follow whereas one.