A method for preparing 2-pyrazolin-5-ones from 1,2,4-oxadiazoles is described. The method comprises forming a liquid reaction system of a base catalyst and a 1,2,4-oxadiazole in an organic liquid reaction medium and heating the reaction system to a temperature sufficient to cause the 1,2,4-oxadiazole to be rearranged to a 2-pyrazolin-5-one.
本文描述了一种从1,2,4-噁二唑制备2-
吡唑烷酮的方法。该方法包括在有机液相反应介质中形成碱催化剂和1,2,4-噁二唑的液态反应体系,并将反应体系加热至足以使1,2,4-噁二唑重排成2-
吡唑烷酮的温度。