Die Stabilisierung von Phosphanen P(NHX)3 durch Ligandenreaktionen am Pentacarbonyl(trichlorophosphan)molybdän(0) / The Stabilization of Phosphanes P(NHX)3 by Ligand Reactions of Pentacarbonyl(trichlorophosphane)molybdenum(0)

Abstract

Phosphanes P(NHX)3, which are usually unstable, were prepared as ligands in the complexes (CO)5MoP(NHX)3 (X = H, Me, i-Pr, Ph, PhNH) (2-6) by reactions of (CO)5MoPCl3 with ammonia, primary amines, and Phenylhydrazine. Attempts to prepare (CO)5MoP(NH-t-Bu)3 were unsuccessful: however, (CO)5MoPCl3 reacts with an excess of t-BuNH2 under similar conditions to give (CO)5MoNH2-t-Bu (7) and (CO)5Mo[P(NH-t-Bu)N2-Bu]2 (8). The diazadiphosphetidin complex 8, in which the metal is bound to phosphorus, can also be prepared directly by UV-irridation of a THF solution of Mo(CO)6 and the free ligand.