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 .