1, 2-Bis(di- p-tolylphosphino)ethane complexes of Group VI metal carbonyls

Abstract

New complexes of the type [M(CO) 4(dptpe)] (M = Cr, Mo, W) have been isolated from the reaction of the ligand, 1, 2-bis(di- p-tolylphosphino)ethane (dptpe) with Group VI metal hexacarbonyls in a suitable solvent such as methylcyclohexane. The resulting [M(CO) 4(dptpe)] complexes on treatment with an excess of pyridine produces the mixed ligand complexes [M(CO) 3(py)(dptpe)], whereas the reaction of [XMo(CO) 2(η 3-allyl)(MeCN 2)] (X = Cl, Br) with dptpe gives [XMo(CO) 2(η 3-allyl)(dptpe)]. The formulation of the structures of these complexes follows from elemental analyses and 1H NMR, 31P{ 1H} NMR and IR spectral studies. Carbonyl force constants have been calculated from the ν(CO) stretching frequencies by the Cotton and Kraihanzel method.