CAS 2120-82-3: 3,5-Dichloro-1,2-thiazole-4-carbonitrile

3,5-Dichloroisothiazole-4-carbonitrile is used as a reagent in organic synthesis. It is a regiospecifically chlorinated derivative of 3,5-dichloroisonicotinamide that can be prepared by reacting ethyl bromoacetate with chlorosulfonyl isocyanate. This compound reacts with phenols to give 3-chloro-1,2,4-benzothiadiazoles and other products. The reaction is catalysed by alkalis and reactive chlorine compounds such as chlorine gas or chlorosulfonic acid. 3,5-Dichloroisothiazole-4-carbonitrile also reacts with amines to give amides. 3,5-Dichloroisothiazole-4-carbonitrile reacts with halogens to form alkyl halides or alkyl sulfonates.