Sodium sulfide hydrate is at least partially dehydrated by heating with N-methyl 2-pyrrolidone. 2-chlorobenzamide is added to the mixture which is heated further. The mixture is cooled and treated with aqueous hydrogen peroxide to give the sodium salt of 1,2-benzoisothiazoline-3-one in good yield. Acidification if desired gives rise to the free 1,2-benzoisothiazoline-3-one.
硫酸钠水合物通过与N-甲基
2-吡咯烷酮加热至少部分脱
水。将2-
氯苯甲酰胺加入混合物中,继续加热。混合物冷却后,用
过氧化氢水溶液处理,可得到1,2-苯并
异噻唑啉-3-酮的钠盐,收率较高。如果需要酸化,可以得到游离的1,2-苯并
异噻唑啉-3-酮。