Process for the preparation of cyclic sulphates
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United States of America Patent
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May 8, 1990
Grant Date -
N/A
app pub date -
May 15, 1989
filing date -
May 16, 1988
priority date (Note) -
Expired
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Abstract
Cyclic sulphates of formula ##STR1## in which R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, and R.sub.6, 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.degree. to 250.degree. C., of concentrated sulphuric acid with a glycol of formula ##STR2##
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