REACTIVITY OF RU(OAC)2(PH3P)2 TOWARD CHELATING DIPHOSPHINE LIGANDS - X-RAY CRYSTAL-STRUCTURES OF FAC-RU(OAC)2(PH3P)(DPPM) AND TRANS-RU(OAC)2(P2N2H4)

Interaction of Ru(OAc)2(Ph3P)2, 1, with one and two equivalents of L ( L = Ph2P(CH2)nPPh2; n = 1-3) in refluxing toluene gave Ru(OAC)2(Ph3P)L and Ru(OAc)2L2 in good yield, respectively. The solution dynamic of R u(OAc)2(Ph3P)L complexes (L = Ph2P(CH2)nPPh2; n = 1 and 2) were studie d by variable temperature H-1 and P-31{H-1} NMR spectroscopy. At -50-d egrees-C, the two acetate groups exist as a eta2- and a eta1-acetate g roup which exchange rapidly at room temperature. X-Ray diffraction stu dy of Ru(OAc)2(Ph3P)(dppm) reveals the presence of a eta1- and a eta2- acetate ligand and a fac-configuration for the phosphine ligands. Inte raction of 1 with one equivalent of L' (L' = Ph2P(CH2)4PPh2 and P2N2H4 ) in refluxing toluene gives the corresponding Ru(OAc)2L' complex in h igh yield. X-Ray diffraction study of Ru(OAc)2(P2N2H4) reviews that th e two acetate groups are monodentate coordinated and are in a mutually trans position.