( ix) Oxidation Use of diffrent oxidising agents gives difTerent products. e. g.,
Separation of Mixture of Amines( 1 °, 2 ° and 3 °)
( a) Fractional distillation This method Is based on the boiling points of amines and is used satIsfactorily in Industry.
( b) Hofmann’ s methoOd Diethyloxalate is called Hofmann’ s reagent with which mixture of amines is treated.
1 ° amine forms solid dialkyl oxamide( CONHR) 2 2 ° amine forms liquid dialkyl oxamlc ester( CONR2-COOC2H5) 3 ° amlnes do not react
( c) Hlnsberg’ s method see. chemkal reactions.
Benzene Diazonium Chloride( C6H5N2 +; Cl-) Preparation( Diazotisation reaction)
The excess acid in diazotisation reaction is necessary to maintain proper acidic medium for the reaction and to prevent combination of diazonium salt formed with the undiazotised amine.
Diazonium salts are prepared and used in aqueous solutions because in solid state, they explode.