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Polynuclear Homo- or Heterometallic Palladium(II)−Platinum(II) Pentafluorophenyl Complexes Containing Bridging Diphenylphosphido Ligands. 6. † Syntheses and Molecular Structure of [Pt 4 (μ 2 -PPh 2 ) 4 (C 6 F 5 ) 4 (CO) 2 ]·2CH 2 Cl 2 and [Pt 2 Pd 2 (μ 2 -PPh 2 ) 2 (μ 3 -PPh(1,2-η 2 -Ph)-κ 3 P )- (C 6 F 5…

1997; American Chemical Society; Volume: 16; Issue: 26 Linguagem: Inglês

10.1021/om9706469

1520-6041

Larry R. Falvello, J. Forniés, Consuelo Fortuño, Antonio Martı́n, Ana P. Martínez-Sariñena,

Asymmetric Hydrogenation and Catalysis

The reaction of [NBu4]2[{(C6F5)2Pt(μ-PPh2)2Pt(μ-Cl)}2], A, with CO in CH2Cl2 gives the expected dinuclear compound [NBu4][(C6F5)2Pt(μ-PPh2)2PtCl(CO)], 1, which reacts with AgClO4 (1:1 molar ratio) in CH2Cl2 to produce the tetranuclear cluster [Pt4(μ-PPh2)4(C6F5)4(CO)2], 2. The analogous complex [NBu4]2[{(C6F5)2Pt(μ-PPh2)2Pd(μ-Cl)}2], B, does not react with CO under similar conditions, but treatment of B with AgClO4 (1:2 molar ratio, CH2Cl2) renders the tetranuclear compound [Pt2Pd2(μ-PPh2)3(C6F5)3(PPh2C6F5)], 3, in which the PPh2C6F5 ligand is produced through an unusual M−PPh2/M−C6F5 reductive coupling. Complex 3 reacts with CO in CH2Cl2 producing the tetranuclear complex [Pt2Pd2(μ-PPh2)2(μ3-PPh(1,2-η2-Ph)-κ3P)(C6F5)3(CO)(PPh2C6F5)], 4. The molecular structures of complexes 2 and 4 have been established by X-ray crystallography.