A Diastereomer of an ortho-Palladated R)-α-Methylbenzylamine Complex Containing an (R,R)-Tetra(tertiary phosphine) in Which the Two Organometallic Rings Have Opposite Helicities

Abstract

The bis(palladium(II)–(R)-a-methylbenzylamine) diastereomers of the (R*,R*)-(±)-form of the lin- ear tetra(tertiary phosphine) 1,1,4,7,10,10-hexaphenyl-1,4,7,10-tetraphosphadecane, (R_C)(R_P,R_P)- and (R_C)(S_P,S_P)-(4), are readily separated because of a large difference in their solubilities in moderately polar solvents. The single-crystal X-ray structure of (R_C)(S_P,S_P)-(4), along with published data on (R_C)(R_P,R_P)-(4), suggests that the ease of separation is due to conformational differences in the two organometallic rings present in each diastereomer (δδ or δ&lgr;) in the solid state.