Abstract
ABSTRACT. Coupling of 5-amino-1,3-diaryl-pyrazoles 1a-c with diazonium salts of different aryl amines gave a series of novel1,3-diaryl-5-amino-4-arylazopyrazoles 3a-l . Such compounds could be also obtained by reaction of 5-amino-1,3-diaryl-4-nitroso-1 H -pyrazoles 2a-c with different aryl amines in alkaline medium. Oxidation of azo derivatives 3a-l with cupric acetate, in dimethy lformamide and stream of air, gave 2, 4,6-triaryl-2,4-dihydropyrazolo [4,3- d ]-1,2,3-triazoles 4a-l . and the fluorescence properties of the cyclic triazoles were studied. Diazotization of 5-amino-1,3-diaryl-1 H -pyrazoles 1a-c by sodium nitrite in ortho-phosphoricacid followed by coupling with some aryl amines gave o -aminoazo compounds 5a-f . Cyclisation of compounds 5a-f in pyridine and cupric acetate gave the corresponding triazoles 6a-f . The coupling of compounds 6a-f with different aryl diazonium salts gavecompounds 7a-j . The synthesized dyes were applied to polyesters as disperse dyes and the fastness properties were evaluated.
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