A convenient stereoselective process for the preparation of .alpha.-alkylidene-substituted-.gamma.-butyrolactones and .delta.-valerolactones is provided. The process involves reacting an .alpha.-acyl lactone, an aldehyde, and an alkali metal hydroxide in an inert diluent at an elevated temperature while removing water.
提供了一种方便的立体选择性过程,用于制备α-烷基亚甲基取代的
γ-丁内酯和
δ-戊内酯。该过程涉及在惰性稀释剂中以升高温度反应α-酰基内酯、醛和碱
金属氢氧化物,同时除去
水。