Transfer Hydrogenation in Water via a Ruthenium Catalyst with OH Groups near the Metal Center on a bipy Scaffold
作者:Ismael Nieto、Michelle S. Livings、John B. Sacci、Lauren E. Reuther、Matthias Zeller、Elizabeth T. Papish
DOI:10.1021/om200638p
日期:2011.12.12
2′-bipyridyl (dhbp) was synthesized via its tautomer, and this provides an efficient route to novel metal complexes of dhbp. In ruthenium complexes of dhbp, these OH groups enhance water solubility and may play a role in aqueous transfer hydrogenation with formate/formic acid as the hydrogen source. A series of cationic catalysts, [(η6-arene)Ru(N,N)Cl]Cl (arene = cymene, C6Me6; N,N = bipyridyl with OH, OMe, or
通过其互变异构体合成了新的配体6,6'-二羟基-2,2'-联吡啶(dhbp),这为dhbp的新型金属配合物提供了一条有效途径。在dhbp钌络合物中,这些OH基团提高了水溶性,并可能在以甲酸/甲酸为氢源的水转移加氢中发挥作用。一系列阳离子催化剂的,[(η 6 -arene)的Ru(N,N)CL]氯(芳烃=伞花烃,C 6我6; N,N =联吡啶基,在6和6'位置带有OH,OMe或H),进行了充分表征,并测试了在各种极性质子介质中的转移氢化活性。在水性介质(90/10水/甲醇)中,dhbp的Ru络合物的性能优于其他测试的催化剂(均为1 mol%),并且在6小时内观察到了芳族酮向相应醇的高转化率。OH基团对于将水用作绿色溶剂似乎必不可少,并且可能允许金属-配体双功能催化。