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The tetrakis(phosphane oxide) C6H2{CH2P(O)Ph2}4‐1,2,4,5 (5), has been prepared in high yield from the Arbuzov reaction of C6H2(CH2Br)4‐1,2,4,5 (4), with excess (7 equiv.) of Ph2POEt. Subsequent reduction of 5 with HSiCl3 (12 equiv.) in C6H4Cl2‐1,2 afforded the new tetraphosphane C6H2(CH2PPh2)4‐1,2,4,5 (6), in high yield. The reaction of 6 with [RuCl2(PPh3)4] in CH2Cl2 afforded the green dinuclear ruthenium(II) coordination complex [{RuCl2(PPh3)}2{C6H2‐ (CH2PPh2)4‐1,2,4,5‐P,P′,P′′,P′′′}]·0.5 CH2Cl2 (8), in 39% isolated yield. The solid‐state molecular geometry of 8, determined by X‐ray analysis, shows that the tetraphosphane is ortho‐P,P′‐chelated to each of the two [RuIICl2(PPh3)] units.

Synthesis of a New Multidentate Phosphane Ligand C 6 H 2 (CH 2 PPh 2 ) 4 -1,2,4,5 -X-Ray Structure of a Dinuclear Ruthenium(II)-Bridged Complex:[{RuCl 2 (PPh 3 )} 2 {C 6 H 2 (CH 2 PPh 2 ) 4 -1,2,4,5-P,P',P",P"'}].-The tetraphosphane ligand (I) is synthesized in high yield by Arbuzov reaction of 1,2,4,5-tetrakis(bromomethyl)benzene with Ph 2 POEt followed by reduction with HSiCl 3 . The structure of the Ru complex (II), obtained from (I), is determined by X-ray analysis. -(STEENWINKEL, P.; KOLMSCHOT, S.; GOSSAGE, R. A.; DANI, P.; VELDMAN, N.; SPEK, A. L.; VAN KOTEN, G.; Eur. J. Inorg. Chem. (1998) 4, 477-483; Dep. Met. Mediated Synth., Debye Res. Inst., Utrecht Univ., NL-3584 CH Utrecht, Neth.; EN)