| 摘要 |
Cyclic sulphates of formula <IMAGE> (I) in which R1, R2, R3, R4, R5, and R6, which are identical or different, each denote hydrogen, halogen, alkyl, alkoxy, aryloxy or alkoxycarbonyl and n is 0 or 1, are prepared by rapid reaction, at a temperature of 150 DEG to 250 DEG C., of concentrated sulphuric acid with a glycol of formula <IMAGE> (II)
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