The in situ combination of [Ru(PPh3)3(CO)H2] with xantphos is catalytically active for the alkylation of alcohols with the ketonitriletBuC(O)CH2CN in a model oxidation–Knoevenagel–reduction process. The precursor complex [Ru(xantphos)(PPh3)(CO)H2] was isolated and reacted with stoichiometric amounts of PhCH2OH and PhCHO. Under these conditions, the alcohol is decarbonylated to afford [Ru(xantphos)(CO)2H2] and finally [Ru(xantphos)(CO)3], both of which prove to be less active for catalysis than the starting complex. The reactivity of the xantphos system contrasts with that of [Ru(dppp)(PPh3)(CO)H2], which is catalytically inactive for the Knoevenagel reaction and fails to show any stoichiometric reactivity with alcohols.
在模型氧化-Knoevenagel-还原过程中,[Ru(PPh3)3(CO)H2] 与 xantphos 的原位组合对醇与 ketonitrile tBuC(O)CH2CN 的烷基化具有催化活性。前驱体复合物 [Ru(xantphos)(PPh3)(CO)H2] 被分离出来,并与当量的 PhCH2OH 和 PhCHO 反应。在这些条件下,醇脱羰生成 [Ru(xantphos)(CO)2H2],最终生成 [Ru(xantphos)(CO)3],这两者在催化活性上均不如起始复合物。xantphos 体系的反应性与 [Ru(dppp)(PPh3)(CO)H2] 形成对比,后者对 Knoevenagel 反应无催化活性,并且与醇没有
化学计量反应性。