Reaction of secondary amine with benzene sulfonil chloride produces N, N – di alkyl benzene sulfonamide, which are insoluble in alkaline solutions.
There is no reaction of benzene sulfonil chloride of teritery amines.
The reaction of amines with benzene sulfonil chloride is used to separate them from a mixture of primary, secondary and teritery amines. This method of separating them from the mixture of primary, secondary and teritery amines is called hinsberg method.