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2,3-Diphenyl-1,2,3-triazolo[1,5-a]pyrimidinium salts, the structure of which was confirmed by the PMR spectra, were obtained by condensation of 4-amino-1,5-diphenyl-1,2,3-triazole with β-diketones and their analogs in trifluoroacetic acid. The corresponding 4-acylvinylaminotriazoles are formed by the action of alkali on these salts. It was established that the salts with a methyl group in the 7 position do not form polymethine dyes, whereas the 5,7-dimethyl derivative does gives dyes owing to the activity of the methyl group in the 5 position. The ability of the 5,7-dimethyl derivative to undergo cyanine condensations is explained by the betaine cationic structures of the salts obtained.
KeywordsMethyl Organic Chemistry Pyrimidinium Triazole Betaine
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