A sulfonic acid ester derivative represented by the general formula ##STR1## wherein R.sub.1 is a hydrogen atom, alkyl having 1 to 4 carbon atoms or alkoxy having 1 to 4 carbon atoms, A is a group represented by the general formula ##STR2## (wherein R.sub.2 and R.sub.3 are each alkyl having 1 to 4 carbon atoms) or by the general formula ##STR3## (wherein R.sub.4 and R.sub.5 are each alkyl having 1 to 4 carbon atoms or, when taken together with the cabon atom to which they are attached, form cycloalkyl having 4 to 6 carbon atoms), and l is an integer of from 1 to 3, and a process for preparing the derivative.
一种
磺酸酯衍
生物,其通式表示为 ##STR1## 其中R.sub.1为氢原子,具有1至4个碳原子的烷基或1至4个碳原子的烷氧基,A是由通式##STR2##(其中R.sub.2和R.sub.3均为具有1至4个碳原子的烷基)或由通式##STR3##(其中R.sub.4和R.sub.5均为具有1至4个碳原子的烷基或与它们所连接的碳原子一起形成具有4至6个碳原子的环烷基),l为1至3的整数,以及制备该衍
生物的方法。