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以 30 %H2 O2 为氧源 ,研究了Na2 WO4·2H2 O催化氧化环己烯制己二酸反应中的配体效应 .在大多数情况下 ,配体的酸性越强 ,目标产物己二酸的产率越高 .尽管一些酚类配体、L(+)抗坏血酸和 8 羟基喹啉的酸性较弱 ,但己二酸的产率仍然很高 .这表明影响目标产物产率的因素除配体的酸效应以外 ,还存在配体的配位效应 .邻苯二酚和对苯二酚等酚类配体的实验结果表明 ,反应可能是通过络合催化反应机理完成的 .对酸性配体用量及对反应动力学考察结果表明 ,反应过程中环氧化物水解为 1,2 环己二醇是整个反应的控制步骤 ,反应体系的酸性起到决定性的作用
Using 30% H2 O2 as the oxygen source, the ligand effect in the catalytic oxidation of cyclohexene with Na2 WO4 · 2H2O was studied. In most cases, the stronger the acidity of the ligand, the target product adipic acid The yield of adipic acid is still high despite the weak acidity of some phenolic ligands, L (+) ascorbic acid and 8-hydroxyquinoline, indicating that the factors that affect the yield of the target product are divided In addition to the acid effect of the ligands, the ligand coordination effect exists.Experimental results of phenolic ligands such as catechol and hydroquinone indicate that the reaction may be accomplished through the complexation catalytic reaction mechanism.For acidic ligands The results showed that hydrolysis of epoxide to 1,2-cyclohexanediol was the control step of the whole reaction, and the acidity of the reaction system played a decisive role