名称:
                                Synthesis of New Ruthenium(II) Carbonyl Hydrido, Alkenyl, and Alkynyl Complexes with Chelating Diphosphines
                             
                            
                                摘要:
                                Substitution of one or two triphenylphosphine ligands of Ru(CO)ClH(PPh(3))(3) by bidentate diphosphines Ph(2)P(CH2)(n)PPh(2) (L-L) (n = 1, dppm; n = 2, dppe; n = 3, dppp; n = 4, dppb) or 1, 1'-bis(diphenylphosphino)ferrocene (dppf) led to hydrides Ru(CO)ClH(PPh(3))(2)(L-L) or Ru(CO)ClH(PPh(3))(L-L). The hydride complexes were characterized spectroscopically and by one X-ray structure. Hydride Ru(CO)ClH(PPh(3))(dppf) crystallizes in the monoclinic space group P2(1)/n, with a 17.768(1) Angstrom, b = 25.252(2) Angstrom, c 11.213(1) Angstrom, beta = 92.83(1)degrees, Z = 4, and V = 4459.3(6) Angstrom(3). Reaction of Ru(CO)ClH(PPh(3))(3) or [Ru(CO)H(MeCN)(2)(PPh(3))(2)](PF6-)-P-+ with 2 equiv of diphosphines L-L led to [Ru(CO)H(L-L)(2)](+)A(-) (L-L = dppm, dppe, dppp) (A = Cl, PF6). Hydrides Ru(CO)ClH(PPh(3))(2)(L-L) react with 1-alkynes to give alkenyl complexes Ru(CO)Cl(CH=CHR)(PPh(3))(L-L) with a chelating diphosphine ligand. Ru(CO)ClH(PPh(3))(L-L) gave sigma-alkynyl complexes Ru(CO)Cl(C drop CR)L(L-L) directly in their reactions with 1-alkynes. The hydride with dppb as the ligand showed the highest reactivity. The preparation of hexaco ordinated alkenyl derivatives Ru(CO)Cl(CH=CHR)(PPh(3))(L-L) with a chelating diphosphine was carried out by treatment of other alkenyl derivatives with the diphosphines. Surprisingly, reaction of alkenyls Ru(CO)Cl(CH=CHR)(Me(2)Hpz)(PPh(3))(2) (R = CMe(3), p-MeC(6)H(4)) with dppf led to complexes Ru(CO)Cl(CH=CHR)(Me(2)Hpz)(dppf) by substitution of both PPh(3) ligands instead of the dimethylpyrazole. Ruthenium alkenyls Ru(CO)Cl(CH=CHR)L(dppf) (L = Me(2)Hpz, PPh(3)) react cleanly with 1-alkynes at room temperature to give alkynyl complexes Ru(CO)Cl(C drop CR)L(dppf) in good yield. This reaction was applied to the synthesis of a bimetallic complex Ru(CO)Cl(PPh(3))(dppf)(C drop C-p-C6H4C drop C)Ru(CO)Cl(PPh)(dppf) as a mixture of meso and dl diastereomers.