Effect of the Para-substituent of the Tridentate Pyridine-based Ru（II） Complex upon the Catalytic Activity in Transfer Hydrogenation

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.

三稳定的 4 代用品基于 pyridine 的钌(II ) 建筑群[RuCl2 (PPh3 ) L ](L = 4-R-2,6-bis (diethylaminomethylene ) pyridine， R = Br， H 或 allyloxy ) 被综合。向到酉同类的从白酒的转移加氢的建筑群的催化活动被调查。在 pyridyl 戒指的帕拉取代者的电子效果被探查，我们发现捐赠电子的组增加了催化活动。结果建议一个捐赠电子的组为连接象 carbosilane dendrimer 那样的催化的钌建筑群和化学上惰性的支持分子可能是优先的。