NEW CHIRAL BIDENTATE NITROGEN DONOR LIGANDS - SYNTHESIS OF 1,2-DIIMINOPHOSPHORANES AND THEIR PALLADIUM COMPLEXES

The reaction of 1,2-diamines 1a-c with Ph3PBr2 in the presence of trie thylamine gives rise to the corresponding diphosphonium salts 2a-c in good yields. Treatment of these salts with NaH at room temperature in CH2Cl2 affords the diiminophosphoranes 3a-c in near quantitative yield s. Derivatives 3a,b react with (CH3CN)(2)PdCl2 giving stable (diiminop hosphorane)PdCl2 complexes 4a,b. The solid state structure of complex 4a is described. (C) Academie des sciences/Elsevier, Paris.