Methyldiphenylphosphine

Methyldiphenylphosphine is the organophosphine with the formula CH3(C6H5)2P, often abbreviated PMePh2. It is a colorless, viscous liquid. It is a member of series (CH3)3-n(C6H5)2P that also includes n = 0, n = 1, and  n = 3 that are often employed as ligands in metal phosphine complexes.

Methyldiphenylphosphine is prepared by reaction of chlorodiphenylphosphine with methyl Grignard reagent:
 * Cl(C6H5)2P +  CH3MgBr  →   CH3(C6H5)2P  +  MgBrCl

Selected derivatives:
 * The phosphine oxide OPMePh2, prepared by treatment with hydrogen peroxide.
 * The coordination complex MoH4(PMePh2)4, prepared by treatment of MoCl4(PMePh2)2 with sodium borohydride in the presence of excess ligand.
 * The coordination complex CoCl2(PMePh2)2, prepared by treating cobalt(II) chloride with the phosphine.
 * The phosphine-borane H3BPMePh2 prepared by treating the phosphine with borane.