Carbonyl-Monoolefin-Derivate des Chroms,Molybdäns und Wolframs. I. Tetracarbonyl-Phosphin-Olefin-Komplexe

Carbonyl Monoolefin Derivatives of the Group VI Transition Metals. I. Tetracarbonyl Phosphine Olefin Complexes Monoolefin complexes cis-M(CO)₄(PR₃)(olefin) (M ? Cr, Mo, W; R ? Et, Bu, Prⁱ, Ph; olefin ? maleic anhydride, dimethyl maleate, dimethyl fumarate, bis(trimethylsilyl) fumarate, ethylene) are obtained from the ionic compounds Et₄NR₃PM(CO)₄Cl] either via ethanol or acetonitrile derivatives M(CO)₄(PR₃)L, or directly in a two phase system. The olefins are displaced by Lewis-bases such as amines or phosphines under mild conditions.