Reaction with, alkylating agents diazonium salts

The reaction of a primary amine with nitrous acid to form a diazonium salt. (p. 910) Treatment of an amine with an excess of an alkylating agent (often methyl iodide) to form the quaternary ammonium salt. (p. 900)... 

Little is known about the reaction of 3 with electrophiles other than alkylating and acylating agents, but attack of arene (or hetarene) diazonium ions (as Bp4 salts) on N-3 of 3 or its sodium salt, to generate 3-aryl (or 3-hetaryl)azo-3,4-dihydro-l,2,3-benzotriazin-4-ones 94, has been reported <1984J1C65>. 

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