Process for the preparation of salt free, water free 3-isothiazolone compounds
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United States of America Patent
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Nov 26, 1991
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N/A
app pub date -
Jan 12, 1990
filing date -
Jan 12, 1990
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Expired
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Abstract
A process for preparing a 3-isothiazolone of the formula ##STR1## wherein Y is selected from the group consisting of alkyl or substituted alkyl of 1 to 10 carbon atoms; unsubstituted or halogen-substituted alkenyl or alkynyl of 2 to 10 carbon atoms; and aralkyl or halogen-, lower alkyl-, or lower alkoxy-substituted aralkyl of up to 10 carbon atoms; X is hydrogen or a (C.sub.1 -C.sub.2) alkyl; and X.sup.1 is hydrogen, chlorine, or a (C.sub.1 -C.sub.2) alkyl; comprising (a) reacting anhydrous ammonia with an isothiazolone salt of the formula ##STR2## wherein Z is chlorine, bromine, sulfate or fluorosulfonate; m is 1 when Z is chlorine, bromine or fluorosulfonate, and m is 2 when Z is sulfate; and (b) separating the resultant (NH.sub.4).sub.m Z from the resultant free base isothiazolone is disclosed.
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