| Přispěvatelé: |
Frenna, V, Palumbo Piccionello, A, Cosimelli, B, Ghelfi, F, Spinelli D, Vincenzo, Frenna, Antonio Palumbo, Piccionello, Cosimelli, Barbara, Franco, Ghelfi, Domenico, Spinelli |
| Popis: |
The kinetics of the ring-into-ring conversion of some new (Z)-phenylhydrazones of 3-benzoyl-1,2,4-oxadiazole containing different nitrogen-substituents at C-5 (3b-d; X = NHMe, NMe2, and NHCOMe) into the relevant triazoles 4b-d have been examined in a wide range of pS+ (0.1-11.9) in 1:1 (v/v) dioxane/water solution. The obtained results have been compared with previous data concerning the (Z)-phenyl-hydrazone of 5-amino-3-benzoyl-1,2,4-oxadiazole (3a; X = NH2). All of the studied (Z)-phenylhydrazones rearrange through three different pathways (specific acid-catalysed, uncatalysed and general base-catalysed). The different effects of the substituents on the course of the rearrangement in the three pathways have been examined. © 2014 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. |
