| 摘要 |
Cyclic sulphates of formula: <IMAGE> (I) are prepared by oxidation of a cyclic sulphite of formula: <IMAGE> (II) with a hypohalite of an alkali or alkaline-earth metal and a catalytic quantity of a ruthernium derivative (RuO2, RuCl3). In formulae (I) and (II), R1, R2, R3, R4, R5 and R6 are identical or different and each represents hydrogen, halogen, alkyl, alkoxy, aryl, aryloxy or alkoxycarbonyl.
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