摘要:
The complexes trans-[RuCl2(L){(S,S)-Pr-i-pybox}] ((S,S)-Pr-i-pybox 2,6-bis[4'-(S)-isopropyloxazolin-2'-yl] pyridine, L - PMe3 (1), P(OMe)(3) (2), PPh2(CH2CH=CH2) (3), CNBn (5), CNCy (6) and MeCN (7)) have been synthesized by substitution of ethylene on the precursor trans-[RuCl2(eta(2)-C2H4){(S,S)-Pr-i-pybox}]. This complex also reacts with cyclooctadiene (cod) or norbornadiene (nbd) and NaPF6, in refluxing methanol, giving the coordination compounds [RuCl(eta(4)-cod){(S,S)-Pr-i-pybox}][PF6] (8) and [RuCl(eta(4)-nbd){(S,S)-Pr-i-pybox}][ PF6] (9). The structures of complexes [RuCl(CO)(PPh3)(H-pybox)][BF4] (H-pybox = 2,6-bis(dihydrooxazolin-2'-yl)pyridine) (4), 6 and 8, have been resolved by X-ray diffraction methods. The catalytic activity of the new complexes in transfer hydrogenation of acetophenone has also been examined. (C) 2011 Elsevier B.V. All rights reserved.