But secondary and _ tertiary amines react with nitrous acid in different manner.
Methyl amine give dimethyl ether with HNO2.
( vi) Reaction with aryl sulphonyl chloride [ Hinsberg reagent ] The reaction of benzenesulphonyl chloride with primary amine yield N-ethyl benzenesulphonyl amide.
Tertiary amines does not react with benzenesulphonyl chloride.
( vii) Reaction with aldehydes Schiff base is obtained.