18371-08-9

Upstream product

• 106-49-0 p-toluidine 
• 108-45-2 m-phenylenediamine 

Downstream Products

• 1375235-56-5 C₂₁H₁₄N₄O₄ 
• 75953-50-3 6-Amino-2-p-tolyl-2H-benzo[1,2,4]triazin-3-one 
• 75953-42-3 (3-Ethoxycarbonylamino-4-p-tolylazo-phenyl)-carbamic acid ethyl ester 
• 6659-91-2 2-(p-Tolyl)-5-amino-benzzotriazol 

Relevant academic research and scientific papers

SYNTHESIS OF SOME 2-ARYL-6-AMINO-2,3-DIHYDRO-1,2,4-BENZOTRIAZIN-3-ONES

Acylation of 2,4-diaminoazobenzene and its derivatives Ia-Ih with ethyl chloroformate gives high yields of the corresponding 2,4-bis(ethoxycarbonylamino)azobenzenes IIa-IIh which, on boiling in acid medium, are cyclized with simultaneous splitting off the second ethoxycarbonyl group to give the mesomeric 6-amino-2-aryl-3-oxo-2,3-dihydro-1,2,4-benzotriazinium cations IIIa-IIIh; the latter have been transformed into free bases IVa-IVh or their tautomers Va-Vh.Constitution of the prepared compounds has been studied by IR spectroscopy.Influence of medium on valence vibrations of the carbamate NH groups in the compounds II has also been studied.