High-pressure synthesis of [Ru-2(mu-dppm)(2)(mu-CO)(CO)(4), Ru-2(mu-dppm)(mu-dmpm)(mu-CO)(CO)(4)], and [Ru(dcypm)(CO)(3)] from Ru-3(CO)(12) and the diphosphines: R(2)PCH(2)PR(2); R=CH3 (dmpm), C6H5 (dppm) and C6H11 (dcypm). Crystal and molecular structures of [Ru-2(mu-dppm)(2) (mu-CO)(CO)(4)], and [Ru(dcypm)(CO)(3)]

The high-pressure (1300 psi CO, 120 degrees C) reactions of Ru-3(CO)(12) with the diphosphines R(2)PCH(2)PR(2); R = CH3 (dmpm), C6H5 (dppm), and C6H11 (dcypm), are reported. In the case of dppm, the disphosphine-bridged dinuclear ruthenium complex [Ru-2(mu-dppm)(2)(mu-CO)(CO)(4)] was obtained. The corresponding reaction with dcypm afforded the mononuclear chelated diphosphine complex [Ru(dcypm)(CO)(3)]. The mixed ligand system [Ru-2(mu-dppm)(mu-dmpm)(mu-CO)(CO)(4)] was obtained by employing a 1:1 mixture of dppm and dmpm. The crystal and molecular structures of [Ru-2(mu-dppm)(2)(mu-CO)(CO)(4)] and [Ru(dcypm)(CO)(3)] were also determined. (C) 1997 Elsevier Science Ltd.