Pd(Ⅱ)/BQ催化环己烯氧化合成环己酮的反应机理

Mechanism of Oxidation of Cyclohexene to Cyclohexanone Catalyzed by Pd(Ⅱ)/BQ

在乙腈的酸性水溶液中，考察了Pd（OAc）2、Pd（NO3）2、PdCl2和苯醌（BQ）组成的催化体系在环己烯氧化合成环己酮反应中的催化活性，探索了酸度对Pd（OAC）2／BQ催化活性的影响．结果表明，Pd（OAc）2／BQ和Pd（NO3）2／BQ对环乙烯氧化合成环己酮显示了较高的催化活性，而PdCl2／BQ的活性则较低，无水和无酸存在的溶液中，Pd（OAc）2／BQ对环己烯氧化未显现任何催化活性．并用紫外可见光谱（UV－Vis）。

In an acid aqueous solution of acetonitrile, the catalytic artivites of catalsts consisted of benzoquinone (BQ) with Pd(OAc)2、Pd(NO3)2、PdCl2 for the oxidation of cyclochexene to cyclohexanone were examined, and the effect of the concentration of acid was investigated The results showed that both.Pd(OAc)2/BQ and Pd(NO3)2/BQ had high catalytic activity, however, PdCl2/BQ only had poor catalytic achvity, Pd(OAc)2/BQ was not active in a nonaqueous and nonacid soution for the oxidation of cyclohexene. The mechanism of oxidation of cyclohexene catalyzed by Pd(OAc)2/BQ was studied by UV-Vis and cyclic voltammetry.