Ru(NNS)(PPh₃)Cl₂ (NNS=2‐(methylthio)‐N‐(pyridin‐2‐yl‐methyl)ethan‐1‐amine) was employed in the hydrogenation of α,β‐unsaturated esters, reaching selectivities for the allylic alcohol up to 95% in the hydrogenation of iso‐butylcinnamate. In addition, several ester substrates were hydrogenated with catalyst loadings as low as 0.05 mol%. Surprisingly, selectivity of the hydrogenation of the C=O vs the C=C bonds strongly depends on the solvent.

中文翻译：

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廉价的NNN络合物作为具有高C = O与C = C选择性的高效酯加氢催化剂

Ru（NNS）（PPh ₃）Cl ₂（NNS = 2-（甲硫基）-N-（吡啶-2-基-甲基）乙-1-胺）用于α，β-不饱和酯的加氢反应，达到肉桂酸异丁酯加氢中烯丙基醇的选择性高达95％。另外，几种酯底物以低至0.05mol％的催化剂负载量被氢化。令人惊讶地，C ＝ O对C ＝ C键的氢化选择性很大程度上取决于溶剂。