Process for the preparation of 4,5-tri- and -tetramethylene-4-isothiazolin-3-ones, 2-alkyl or -aralkylthio-1-cycloolefin carbonamides for use in this process and process for the preparation of the 2-alkyl- or -aralkylthio-1-cycloalkene carbonamides.

摘要

A process for preparing a 4,5-tri or tetramethylene-4-isothiazoline-3-one comprises cyclizing a 2-alkyl or aralkyl thio-1-cycloalkene-1-carboxamide in the form of its sulfoxide in an organic solvent in the presence of a acid chloride and adding to the resulting 4,5-tri or tetramethylene-4-isothiazoline-3-one hydrochloride a mineral or organic base or water so as to free the 4,5-tri or tetramethylene-4-isothiazoline-3-one in the form of a free base.