Synthesis and reactivity of cationic alkene–alkyne molybdenum complexes; structural evidence for the formation of an η3,η3-bonded hexatriene ligand by coupling of a co-ordinated alkyne and a 1,3-diene

Abstract

The synthesis and reactions of the simple alkene/(4e)–alkyne complex [Mo(η²-C₂H₄)(η²-MeC₂Me)(CO)(η-C₅H₅)][BF₄] is described; reaction with isoprene leads to a novel coupling reaction and the formation of an η³,η³-bonded hexatriene cation identified by X-ray crystallography.