Short-bite chiral diphosphazanes derived from (S)-α-methyl benzyl amine and their Pd, Pt and Rh metal complexes

Abstract

New chiral diphosphazane ligands of the type Ph₂PN(S-^∗CHMePh)PYY' {YY' = Ph₂ (2), O₂C₆H₄ (3); Y = Ph, Y' = Cl {4a (SS), 4b (SR)}, N₂C₃HMe₂-3,5 {5a (SR), 5b (SS)} are synthesised starting from a chiral aminophosphine, Ph₂PNH(S-^∗CHMePh) (1). The structure of one of the diastereomer 5a has been confirmed by single crystal X-ray diffraction {Orthorhombic system, P2₁2₁2₁; a=10.456 (4), b=15.362 (7), c=17.379 (6) Å, Z=4}. Transition metal mononuclear complexes [Rh{η₂-(Ph₂P)₂N-(S-^-CHMePh)}₂]+(BF₄)^- (6), [PdCl₂{η₂-(Ph₂P)₂N(S^∗CHMePh)}] (7) and [PtCl₂{η₂-(Ph₂P)₂N-(S-^∗CHMePh)}] (8) have also been synthesised. The structure of the palladium complex 7 is solved by X-ray crystallography {Orthorhombic system, P2₁2₁2₁; a=8.746 (2), b=18.086 (2), c=20.811 (3) Å, Z=4}. All these compounds are characterised by micro analyses, IR and NMR spectroscopic data.