Novel Binuclear Phosphinidene Compounds by Dimerization of the PH‐Functional Phosphenium Complexes [C 5 R 5 (CO) 2 WPH(Mes)] (R = H, Me)

A 15- and a 17-electron metal complex fragment stabilize the MesP unit (Mes = 2,4,6-trimethylphenyl) in the binuclear complexes 1 (R = H, Me). These are formed as the dimerization product of the PH-functional phosphe-nium complexes 2, which can be trapped with Me3P as metalliophosphanes 3.