The Lewis Acidic Ruthenium-Complex-Catalyzed Addition of β-Diketones to Alcohols and Styrenes Is in Fact Brønsted Acid Catalyzed
作者:Pei Nian Liu、Zhong Yuan Zhou、Chak Po Lau
DOI:10.1002/chem.200700705
日期:2007.10.15
toward 1-phenylethanol in the presence of HClO4; it also fails to catalyze the addition of acetylacetone to 1-phenylethanol. On the basis of these observations, it is proposed and confirmed by independent experiments that the catalytic addition of beta-diketones to the secondary alcohols is in fact catalyzed by the Bronsted acid HClO4, which is generated by the reaction of cis-[Ru(6,6'-Cl2bipy)2(H2O)2](ClO4)2
联吡啶-钌络合物顺式[[Ru(6,6'-Cl2bipy)2(H2O)2] 2+]的高氯酸盐可有效催化将β-二酮添加到仲醇和苯乙烯中,从而生成α-烷基化的β-二酮。在乙酰丙酮与1-苯乙醇的催化加成反应中,催化后分离出κ2-乙酰丙酮络合物[Ru(6,6'-Cl2bipy)2(κ2-acac)] ClO4。通过使顺式-[Ru(6,6'-Cl2bipy)2(H2O)2](ClO4)2与乙酰丙酮反应,可以轻松合成该配合物。[Ru(6,6'-Cl2bipy)2(kappa2-acac)] ClO4在HClO4存在下对1-苯基乙醇不反应;它也不能催化将乙酰丙酮加到1-苯基乙醇中。根据这些观察,