Axially Dissymmetric diphosphines in the Biphenyl Series: Crystal structures of three new group-VIII metal complexes of (6,6′-dimethyl-1,1′-biphenyl-2,2′-diyl)bis(diphenylphosphine) ( = biphemp)

(6,6′-Dimethyl-1,1′-biphenyl-2,2′-diyl)bis(diphenylphosphine) ( = biphemp) reacts with allymetal halidesm to yeild complexes 1–3 which were transformed into the corresponding perchlorates 4–6 . The molecular structures of 4–6 were determined by X-ray analyses.