The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 19, 2026
Filed:
Oct. 25, 2021
Thor Gmbh, Speyer, DE;
Rüdiger Baum, Speyer, DE;
Holger Bittermann, Schriesheim, DE;
Zhenghao Yang, Jiangsu, CN;
Zhang Chaoqiang, Jiangsu, CN;
Changhua Zhang, Jiangsu, CN;
Qinglin Zheng, Jiangsu, CN;
Ashraf Farouk, Landau, DE;
Thor GmbH, Speyer, DE;
Abstract
The invention relates to a process for preparing 1,2'-benzisothiazoline-3-one according to formula (I), comprising the following steps: (a) reacting a 2-halogenbenzonitrile compound of general formula (II) with a reaction mixture, containing: (i) alkaline sulphide and/or alkaline hydrogen sulphide and (ii) an alkyl halide compound, represented by general formula (III): RX (III) for producing an intermediate product of general formula (IV), and (b) reacting the intermediate product of general formula (V) obtained in step (a) with a halogenating agent or an oxidant and subsequent reaction of the 2-(alkylsulfoxy)benzonitrile with an acid to form 1,2-benzisothiazoline-3-one as well as a halide compound of general formula (V) RX (V).
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