Reactions of cyanoalkenes with a tungsten hydrazido (2–) complex: the X-ray crystal structure of [WBr(dppe)2{NC(Br)C(CN)C(CN)2}], a bromotricyanoprop-2-enylideneamino-complex
Abstract
Cyanoalkenes react with the dinitrogen-derived hydrazido(2–) complex [WBr(dppe)2N2H2]+ Br–(1) to form either vinyldiazenido-complexes or, after loss of the hydrazido (2–) ligand, to form nitrile-derived methyleneamino-complexes; the product of reaction with tetracyanoethylene is a bromotricyanoprop-2-enylideneamino-complex which has been characterised by single-crystal X-ray analysis.