Synthesis,Acidity Constants and Tautomeric Structure of 7‐Arylhydrazono[1,2,4]Triazolo[3,4‐b][1,3,4]thiadiazines in Ground and Excited States |
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Authors: | Ahmad S Shawali Ibrahim F Zeid Mahmoud H Abdelkader Alsayed A Elsherbini Farag M A Altalbawy |
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Abstract: | 7‐Arylhydrazono1,2,4]triazolo3,4‐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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Keywords: | Hydrazonoyl halides 1 2 4‐Triazole‐3‐thione Thiohydrazonate esters Forster cycle Hammett equation Tautomerism |
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