2, 2, 5-Tri-substituted-1, 3, 4-dioxazoles have been prepared by the reactions of benzhydroxamic acids with the diethylketals of such ketones as acetone, cyclohexanone, acetophenone and benzophenone. These dioxazoles decompose at elevated temperatures (above 150°C) into phenylisocyanates and ketones. A kinetic study of the decomposition reaction in nitrobenzene has been attempted, and the first-order rate constants have been obtained.
通过苯羟
肟酸与
丙酮、
环己酮、
苯乙酮和
二苯甲酮等酮的
二乙基酮反应,制备出了 2,2,5-三取代的-1,3,4-二
恶唑。这些二
恶唑在高温(150°C 以上)下分解成苯基
异氰酸酯和酮。已尝试对
硝基苯中的分解反应进行动力学研究,并获得了一阶速率常数。