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Facile bromination of the benzene ring during the cyclisation of the 1H-3-methyl-4-ethoxycarbonyl-5-arylidenehydrazonopyrazoles to the 3-substituted-aryl-1H-6-methyl-7-ethoxycarbonyl--pyrazolo[3,2-c]-s-triazoles

oleh: Carol Csunderlik, Vasile Bercean, Francisc Peter, Valentin Badea