ORGANOMETALLIC CHEMISTRY OF DIPHOSPHAZANES - RHODIUM(I) COMPLEXES OF RN(PX(2))(2) (R=C6H5 X=OC6H5, OC6H4BR-P, R=CH3 X=OC6H5)

Reactions of [Rh(COD)Cl](2) with the ligand RN(PX(2))(2) (1: R=C6H5; X =OC6H5) give mono- or disubstituted complexes of the type [Rh-2(COD)Cl -2{eta(2)-C6H5N(P(OC6H5)(2))(2)}-] or [RhCl{eta(2)-C6H5N(P(OC6H5)(2))( 2)}](2), depending on the reaction conditions. Reaction of 1 with [Rh( CO)(2)Cl](2) gives the symmetric binuclear complex, [Rh(CO)Cl{mu-C6H5N (P(OC6H5)(2))(2)}], whereas the same reaction with 2 (R=CH3; X=OC6H5) leads to the formation of an asymmetric complex of the type [Rh(CO)(mu -CO)Cl{mu-CH3N(P(OC6H5)(2))(2)}] containing both terminal and bridging CO groups. Interestingly the reaction of 3 (R=C6H5, X = OC6H4Br-p) wi th either [Rh(COD)Cl](2) or [Rh(CO)(2)Cl](2) leads only to the formati on of the chlorine bridged binuclear complex, [RhCl{eta(2)-C6H5N(P(OC6 H4Br-p)(2))(2)}](2). The structural elucidation of the complexes was c arried out by elemental analyses, IR and P-31 NMR spectroscopic data.