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.
一种制备4,5-三或四亚甲基-4-
异噻唑啉-3-酮的方法,包括在有机溶剂中存在酸性
氯化物的情况下,使2-烷基或芳基烷基
硫代-1-
环己烯-1-羧酰胺的亚砜环化,并向所得的4,5-三或四亚甲基-4-
异噻唑啉-3-酮
盐酸中加入矿物质或有机碱或
水,以释放4,5-三或四亚甲基-4-
异噻唑啉-3-酮的游离碱形式。