Metallkomplexe funktioneller isocyanide XX. Unerwartetes resultat einer cycloaddition zwischen metallonitrilylid und ketenimin

Abstract

The metallo-nitrile ylides M(CO) 5CN ▪H ▪Ph 3 (M = Cr ( 1a), W ( 1b) react with triphenylketeneimine ( 2 1 ) to give one equivalent of triphenylphosphine and the organometallic compounds 3a,b in which a pentacarbonylmetal-6 bound carbenoid [3 + 2]-cycloaddition product has undergone CC-coupling with a second molecule of the starting complex 1. Hydrolysis converts 3a,b into OPPh 3 and 4a,b; as established by X-ray crystallography, 4b is a dinuclear tungsten complex with a (4-isocyanomethyl)imidazolidine-2-ylidene bridging ligand. The spectroscopic data and possible reaction paths are discussed.