NUCLEOPHILIC AND OXIDATIVE ADDITION OF S- R COMPONENTS OF HETEROMETALLACUMULENES

The dimetallaplumbacumulene complex [Cp'(CO)2Mn=Pb=Mn(CO)2CP'] (1) rea cts with NaSMes to give the product of an oxidative addition process [ {Cp'(CO)2 Mn}Pb(SMes)3]- (A4). The ''inidene'' compound [{Cp'(CO)2Mn}2 Pb(SMes)]- (A3), which is an intermediate in this reaction, has not be en isolated. The analogous tin compound [{Cp'(CO)2Mn}2Sn(StButyl)]- (A 12) has been obtained from the reaction of [Cp'(CO)2Mn=Sn=Mn(CO)2Cp'] (10) with LiS(t)Butyl. The structures of the (Na 2,2,2-Crypt.) salt 4 of A4 and of the (Lithium 2,1,1-Crypt.) salt 12 of the anion A12 have been determined by X-ray methods.