Synthesizing method of 2- butyl-1,2-benzisothiazoline-3-ketone

A technology of benzisothiazoline and a synthesis method, applied in directions such as organic chemistry, can solve the problems of low yield, long reaction steps, low product quality and the like, and achieve the effects of good product quality, low production cost, and less three wastes
CN102807532AInactive Publication Date: 2012-12-05LIANYUNGANG SUNLION CHEM
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
LIANYUNGANG SUNLION CHEM
Publication Date
2012-12-05
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a synthesizing method of 2- butyl-1,2-benzisothiazoline-3-ketone, which is characterized by comprising the following steps: (1) reacting 1,2-benzisothiazoline-3-ketone (BIT) with alkali so as to obtain 1,2-benzisothiazoline-3-ketone alkali metal salt; and (2) adding the alkali metal salt into an aprotic polar solvent to react with halogenated normal butane, wherein the halogenated normal butane is one or a combination of two or more of 1-n-propylcarbinyl chloride, 1-n-butyl bromide and 1-n-iodobutane, and preferably is the 1-n-butyl bromide. According to the method, the process cost is low, the production quality is good, and three wastes are few.
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Description

technical field

[0001] The invention belongs to the field of fine chemicals, and in particular relates to a synthesis method of 2-butyl-1,2-benzisothiazolin-3-one. Background technique

[0002] 2-Butyl-1,2-benzisothiazolin-3-one is a widely used fungicide and antifungal agent. The traditional synthesis method uses 2,2'-disulfosalicylic acid (DTSA) as the main raw material, through acyl chlorination of thionyl chloride, chlorine chlorination, and finally n-butylamine ring closure to obtain 2-butyl-1,2-benzo For isothiazolin-3-one (BBIT), the traditional process has long reaction steps, low yield and low product quality. Contents of the invention

[0003] The technical problem to be solved by the present invention is to provide a synthesis method of 2-butyl-1,2-benzisothiazolin-3-one. Technical scheme of the present invention is as follows:

[0004] The present invention relates to 1. a kind of 2-butyl-1, the synthetic method of 2-benzisothiazolin-3-ketone, it is characte...

Claims

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