Metal complexes of biologically important ligands, CXXIX. Palladium(II) and platinum(II) complexes of 4,4-disubstituted oxazolones and of C-2-symmetric bis(oxazolones)

4-Benzyl-4-methyl-2-phenyl-5(4H)-oxazolone (1) forms with the chloro bridge d compounds [R3PMCl2](2) (M = Pt, Pd) the complexes Cl2Pt(PR3)(1) (R = Et, nBu) and Cl2Pd(PEt3)(1). The enantiomeric pure C-2-symmetric CMe2 bridged b is(oxazolones) 5 and 6 have also been employed which give with PdCl2 the ch elate complexes 13 and 14. The X-ray structural determination of Cl2Pd[O-C( O)-CMe2-N=C-CMe2-C=N-CMe2-C(O)-O] (10) shows that one of the methyl group o f the CMe2 bridge is located near the palladium atom. This can also be dete cted in the H-1 NMR spectrum.