• 作者： Ahmad S. Shawali, Ibrahim F. Zeid, Mahmoud H. Abdelkader, Alsayed A. Elsherbini and Farag M. A. Altalbawy
• 中文摘要： Department of Chemistry, Faculty of Science, University of Cairo, Giza, Egypt
  
  7-Arylhydrazono[1,2,4]triazolo[3,4-b][1,3,4]thiadiazines 4 were synthesized from the reactions of 4-amino-5-phenyl-4H-[1,2,4]triazole-3-thiol 2 and 2-(2-naphthyl)-2-oxoethanehydrazonoyl bromides 1 and their acid dissociation constants pK and pK*, in the ground and excited states, respectively, were determined. Both pK and pK* constants were correlated by Hammett equation. The pK and the spectral data presented indicate that the title compounds exist predominantly in the hydrazone tautomeric form.
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