There are provided novel ester derivatives represented by the following formula(I): ##STR1## wherein, R.sub.1 represents methyl, ethyl, isopropyl, t-butyl, or phenyl; R.sub.2 represents phenyl, methoxy, ethoxy, isopropanoxy, or t-butanoxy; and X represents Br, and a process for preparing the same which comprises reacting an aldehyde of the formula (III) with an acid halide of the formula (IV) at 20.degree.-80.degree. C. in the presence or absence of solvents. ##STR2## Wherein, R.sub.1, R.sub.2 and X have the same meaning as defined above.
提供了以下式(I)所代表的新颖酯衍
生物:##STR1## 其中,R.sub.1代表甲基、乙基、异丙基、叔丁基或苯基;R.sub.2代表苯基、甲氧基、乙氧基、异丙氧基或叔丁氧基;X代表Br;以及制备这些酯衍
生物的过程,包括在存在或不存在溶剂的情况下,在20℃至80℃下将式(III)的醛与式(IV)的酸卤化物反应。##STR2## 其中,R.sub.1、R.sub.2和X的含义与上文定义的相同。