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Three stable 4-substituted pyridine-based ruthenium(II)complexes[RuCl2(PPh3)L](L=4-R-2,6-bis (diethylaminomethylene)pyridine,R=Br,H or allyloxy)were synthesized.The catalytic activities of the complexes toward transfer hydrogenation from alcohols to ketones were investigated.The electronic effects of the para-substituent in the pyridyl ring were probed and we found that the electron-donating group increased the catalytic activity.The result suggests that an electron-donating group is probably preferential for linking the catalytic ruthenium complex and the chemically inert supporting molecules such as a carbosilane dendrimer.
Three stable 4-substituted pyridine-based ruthenium (II) complexes [RuCl2 (PPh3) L] (L = 4-R-2,6- bis (diethylaminomethylene) pyridine, R = activities of the complexes toward transfer hydrogenation from alcohols to ketones were investigated. The electronic effects of the para-substituent in the pyridyl ring were probed and we found that the electron-donating group increased the catalytic activity. The result suggests that an electron-donating group is probably preferential for linking the catalytic ruthenium complex and the chemically inert supporting molecules such as a carbosilane dendrimer.