摘要:
                                The reactions of [Pt(NO3)(2)(dppm)] (dppm = bis(diphenylphosphino)methane) and cis -[Pt(NO3)(2)(PEt3)(2)] with sodium ascorbate are described. Complexes containing O,O-coordinated ascorbate ligands are formed initially, but on standing further oxidation and cleavage of the ligand occur to produce the corresponding oxalate complexes. The reactions were monitored by NMR spectroscopy, and reactions of [Pt(NO3)(2)(dppm)] with oxalic acid or calcium threonate also produced [pt(C2O4)(dppm)]. Reactions of [PtMe(Me2CO)(dppe)](+) or [PdMe(Me2CO)(P (boolean AND) P)](+) (P (boolean AND) P = dppe, dppp) with sodium ascorbate result in cleavage of the M-C bond and oxidation of ascorbate to again produce metal oxalate derivatives. The solid state structures of [Pt(C2O4)(dppm)]. Me2CO, [Pd(C2O4)(dppe)].H2O and [Pd-2(mu -C2O4)(dppp)(2)][BF4](2). 2Me(2)CO, determined by X-ray crystallography, are described. (C) 2001 Elsevier Science Ltd. All rights reserved.