Allenylidene complexes bimetallic

Fig. 8 Structure of some mixed bimetallic allenylidene complexes...

Two major developments in the preparation of bimetallic allenylidene complexes involve (i) metal fragment condensation of a monomeric allenylidene complex with a lightly stabilized metal fragment and (ii) deoxygenation of the dianionic acetylide intermediates, [M2(CO)9 C=C-C( Bu2)0 ]2-, with COCI2. 

Three neutral, eoordinatively unsaturated 16-electron Ru-allenylidene complexes of different types, namely the bisphosphane complex 44, the imidazohn-2-ylidene complex 45 and the bimetallic complex 46, are significant members of this class that have been evaluated for their catalytic... 

---