Process for preparing 4-isothiazolin-3-one
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United States of America Patent
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Sep 26, 1995
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app pub date -
Feb 4, 1994
filing date -
May 10, 1991
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Abstract
The present invention relates to an improved process for selectively preparing 4-isothiazolin-3-one having the following structural formula(I), consisted of preparing 3,3'-dithiodipropionyldichloride by reacting 3,3'-dithiodipropionic acid with thionylchloride, reacting with amine compound to prepare 3,3'-dithiodipropioneamide, and herein adding sulfrylchloride in organic solvent to cyclize, which is useful as antiseptic or anti-infectives for cooling water, metal processing oils, paints, cosmetics, surfactants, sensitizers, etc. ##STR1## wherein, R.sup.1 is methyl or n-octyl group; R.sup.2 is hydrogen or chlorine atom.
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