The invention provides a process for epoxidising an olefinic double bond in an olefinically-unsaturated compound other than an (a, β)-unsaturated carboxylic acid or a compound containing a six-membered ring wherein 3 to 4 member atoms are carbon atoms having sp' hybrid orbitals, by treatment of a liquid phase mixture of the olefinically-unsaturated compound, an aldehyde containing at least two carbon atoms and a suitable solvent with oxygen in the presence of a catalyst which is soluble in the reaction mixture and which comprises a praseodymium compound. The process has particularly advantageous application to oxidation of aldrin to dieldrin.
本发明提供了一种使烯烃不饱和化合物中的烯烃双键环氧化的工艺,该烯烃不饱和 化合物不是(a,β)不饱和
羧酸或含有六元环的化合物,其中 3 至 4 个原子是具有 sp'杂化轨道的碳原子、在可溶于反应混合物的催化剂存在下,用
氧气处理由烯烃不饱和化合物、至少含两个碳原子的醛和适当溶剂组成的液相混合物,该催化剂由
镨化合物组成。该工艺尤其适用于将
艾氏剂氧化成狄氏剂。