Substituted Group VI metal carbonyl complexes with the ligands trimethylphosphine, dimethylphenylphosphine, dimethylphenylarsine, and dimethyl phenylphosphonite

Abstract

Series of substituted metal carbonyls of the types [M(CO)_6–xL_x][M = Cr, Mo, or W; x= 1, 2, or 3; L = PMe₃, PMe₂Ph, P(OMe)₂Ph, or AsMe₂Ph] are described. I.r. and n.m.r. spectral data and dipole moment results are given and discussed. The methyl resonance patterns of the tertiary phosphine or phosphonite complexes are not particularly useful in determining stereochemistry since they are of the type corresponding to intermediate phosphorus–phosphorus coupling.