The complex [Ru(triphos)(CH₃CN)₃](OTf)₂ is an effective catalyst for the hydrogenation of 2,5-hexanedione and 2,5-dimethyl-furan in aqueous acidic medium at temperatures between 150 and 200 °C realizing up to 96% combined yields of 2,5-hexanediol and 2,5-dimethyl-tetrahydrofuran with the product distribution being sensitive to the amount of acid co-catalyst (HOTf) present. For the furan, the reaction pathway is through an acid-catalyzed hydrolysis to the dione rather than direct hydrogenation of the ring. The hydrogenation of the dione shows a first order dependence on hydrogen pressure as determined by direct hydrogen uptake rate measurements at temperature and pressure (1.38–6.90 MPa at 150 °C) and is postulated to operate through a heterolytic activation of hydrogen gas by [Ru(H)_x(triphos)(Y)_y]ⁿ⁺ (Y = solvent, water, counter ion) species formed in situ by loss and hydrogenation of the nitrile ligands. In water the catalyst is deactivated by dimerization to [Ru₂(μ-OH)₃(triphos)₂](OTf).

中文翻译：

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[Ru（triphos）（CH ₃ CN）₃ ]（OTf）₂作为均相催化剂，用于酸性介质中氢化生物质衍生的2,5-己二酮和2,5-二甲基呋喃

络合物[Ru（triphos）（CH ₃ CN）₃ ]（OTf）₂是一种有效的催化剂，可在150至200°C的温度下，在含水酸性介质中将2,5-己二酮和2,5-二甲基呋喃加氢，实现2,96-己二醇和2,5的合计产率高达96％ -二甲基-四氢呋喃，产物分布对存在的酸助催化剂（HOTf）的数量敏感。对于呋喃，反应途径是通过酸催化的水解成二酮，而不是环的直接氢化。对二酮的氢化反应显示出对氢压力的一级依赖性，这是通过在温度和压力下（150°C下为1.38–6.90 MPa）直接测量氢的吸收率来确定的，并且假定该氢可通过[Ru]的氢杂化活化作用进行操作。 （H）_x（triphos）（Y）_y ] ⁿ⁺（Y =溶剂，水，抗衡离子）物种通过腈配体的损失和氢化原位形成。在水中，催化剂通过二聚反应失活为[Ru ₂（μ-OH） ₃（triphos） ₂ ]（OTf）。