N alkylated 1 2 benzisothiazolin 3 ones can be prepared in good yield and good selectivity by reaction of the lithium salt of l 2 benzisothiazolin 3 one with an electrophilic alkylating agent.

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 benzisothiazolin 3 one in good yield. Acidification if des...

Aqueous solutions of the tetramethylammonium salt of 1 2 benzothiazolone stable below 0°C.

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 benzisothiazolin 3 one in good yield. Acidification if des...