Allenic esters of the formula: ##EQU1## (specific examples of R, R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are given) and a process for the preparation thereof which comprises reacting propargyl alcohol derivatives with 2-substituted ortho-acetic acid esters in the presence of an acidic catalyst. These allenic esters are rearranged in the presence of an alkali catalyst to form .alpha., .beta., .gamma., .delta.-unsaturated carboxylic acid esters and are useful as intermediates in the synthesis of various perfumes, medicines, agricultural chemicals and the like.
化学式为##EQU1##的Allen
酯类化合物,其中给出了R、R.sub.1、R.sub.2、R.sub.3和R.sub.4的具体示例。其制备方法包括在酸性催化剂存在下,将
丙炔醇衍
生物与2-取代的正交酯酸反应。这些Allen
酯类化合物在碱性催化剂存在下重排,形成α、β、γ、δ-不饱和
羧酸酯,可用作合成各种
香料、药品、农药等中间体。