Reactivity of Ru(OAc) 2(Ph 3P) 2 toward chelating diphosphine ligands. X-ray crystal structures of fac-Ru(OAc) 2(Ph 3P)(dppm) and trans-Ru(OAc) 2(P 2N 2H 4)

Abstract

Interaction of Ru(OAc) 2(Ph 3P) 2, 1, with one and two equivalents of L (L = Ph 2P(CH 2) n PPh 2; n = 1–3) in refluxing toluene gave Ru(OAc) 2(Ph 3P)L and Ru(OAc) 2L 2 in good yield, respectively. The solution dynamic of Ru(OAc) 2(Ph 3P)L complexes (L = Ph 2P(CH 2) n PPh 2; n = 1 and 2) were studied by variable temperature 1H and 31P{ 1H} NMR spectroscopy. At −50°C, the two acetate groups exist as a η 2- and a η 1-acetate group which exchange rapidly at room temperature. X-Ray diffraction study of Ru(OAc) 2(Ph 3P)(dppm) reveals the presence of a η 1- and a η 2-acetate ligand and a fac-configuration for the phosphine ligands. Interaction of 1 with one equivalent of L′ (L′ = Ph 2P(CH 2) 4PPh 2 and P 2N 2H 4) in refluxing toluene gives the corresponding Ru(OAc) 2L′ complex in high yield. X-Ray diffraction study of Ru(OAc) 2(P 2N 2H 4) reviews that the two acetate groups are monodentate coordinated and are in a mutually trans position.