in 1972 reactions of polycyanovinyl halides with metal carbonyl anions were first reported3 to give good yields of stable polycyanovinyl transition metal derivative^.^ Subsequent~ ork~,~ showed that further reactions of these polycyanovinyl transition metal derivatives gave a variety of unusual and interesting cyanocarbon transition metal complexes including compounds containing termina17s8 and bridging3, 4 dicyanovinylidene ligands, ...
