Cyclic sulphates of formula: ##STR1## are prepared by oxidation of a cyclic sulphite of formula: ##STR2## with a hypohalite of an alkali or alkaline-earth metal and a catalytic quantity of a ruthernium derivative (RuO.sub.2, RuCl.sub.3). In formulae (I) and (II), R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 are identical or different and each represents hydrogen, halogen, alkyl, alkoxy, aryl, aryloxy or alkoxycarbonyl.
公式为:##STR1## 的环状
硫酸酯是通过用碱
金属或碱土
金属的次卤酸盐和
铑衍
生物(RuO.sub.2,RuCl.sub.3)的催化量氧化公式为:##STR2## 的环状
亚硫酸盐制备而成。在公式(I)和(II)中,R.sub.1,R.sub.2,R.sub.3,R.sub.4,R.sub.5和R.sub.6相同或不同,每个代表氢,卤素,烷基,烷氧基,芳基,芳氧基或烷氧羰基。