The oxidative decarboxylation reactions of arylacetic acids to arylcarbinols were compared for Mn(III) acetate, Ce(IV) ammonium nitrate and a combination reagent of Co(III) acetate-Cu(II) acetate. The reaction with Mn(III)acetate in acetic acid gave the corresponding arylcarbinyl acetate usually in good yield. The reaction was particularly easy when the substrate carried an electron-donating group at the para position of the aromatic ring, or when the acid was secondary or tertiary. In contrast, the product generated with the other reagents was either a mixture containing over-oxidation products or products formed via a different route.
比较了
醋酸锰(III)、
硝酸铈(IV)
铵和
醋酸钴(III)-
醋酸铜(II)组合试剂将芳基
乙酸氧化脱羧反应生成芳基
甲醇的情况。在
乙酸中与
醋酸锰(III)反应通常能得到相应的芳基
乙酸酯。当底物在芳香环的对位上带有电子奉献基团,或者当酸为仲酸或叔酸时,反应特别容易进行。相反,用其他试剂生成的产物要么是含有过氧化产物的混合物,要么是通过不同途径形成的产物。