Invention Grant
- Patent Title: Process for preparing 1,2-benzoisothiazoline-3-one
- Patent Title (中): 1,2-苯并异噻唑啉-3-酮的制备方法
-
Application No.: US13281600Application Date: 2011-10-26
-
Publication No.: US08476452B2Publication Date: 2013-07-02
- Inventor: Carsten Berg , Sangita Singh
- Applicant: Carsten Berg , Sangita Singh
- Applicant Address: VG Tortola
- Assignee: Titan Chemicals Limited
- Current Assignee: Titan Chemicals Limited
- Current Assignee Address: VG Tortola
- Agency: Clark & Brody
- Main IPC: C07D275/04
- IPC: C07D275/04
Abstract:
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.
Public/Granted literature
- US20130109864A1 PROCESS FOR PREPARING 1,2-BENZOISOTHIAZOLINE-3-ONE Public/Granted day:2013-05-02
Information query
