Carbonyl halides of the Group VI transition metals. XXV. Complexes with the tritolylphosphines

Abstract

The reactions of the halocarbonyls M(CO)₄X₂ [M = Mo, W; X = Cl, Br,I] with the three tolylphosphines (ortho, meta, and para) have been investigated. The variation observed in the nature of the reactions and properties of the products has been explained in terms of a steric effect. The oxidation of trans-M(CO)₄(PPh₃)₂ with halogen, and the reactions of triphenylphosphine with M(CO)₄I₂, have been reinvestigated along with a study of the corresponding reactions for the tritolylphosphines. Mechanisms for these reactions have been proposed.