On reaction with benzeme sulphonyl chloride primary amines yields products soluble in alkali whereas secondary amines yields product insoluble in alkali
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Benzene sulphonyl chloride reaction:-Benzene sulphonyl chloride (C6H5SO2Cl), also known as the reagent of Heisenberg, reacts to form sulphonamides with primary and secondary amines.
N-ethylbenzene sulphonyl amide yields the reaction of benzene sulphonyl chloride with a primary amine.
Because of the presence of strong electron withdrawal sulphonyl group, the hydrogen attached to the nitrogen in sulphonamide is strongly acidic.
It is soluble in alkali, therefore see the below image of reaction
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