A Kinetic Study on the Base-catalysed E --> Z Isomerization of Some Arylhydrazones of 3-Benzoyl-5-phenyl-1,2,4-oxadiazole: Effect of the Substituents in the Arylhydrazone Moiety
The kinetic data obtained in the study of the title reaction reveal unusual substituent effects.A logarithmic plot of reactivity data versus substituent constant (? and/or ?-) shows a 'zigzag' trend; it is suggested that this depends on a chang
Frenna, Vincenzo,Buscemi, Silvestre,Spinelli, Domenico,Consiglio, Giovanni
p. 215 - 221
(2007/10/02)
Mononuclear Heterocyclic Rearrangements. Part 13. Substituent Effects on the Rearrangement of Some Z-Arylhydrazones of 3-Benzoyl-5-phenyl-1,2,4-oxadiazole to 2-Aryl-4-benzoylamino-5-phenyl-1,2,3-triazoles in Benzene, Dioxane, Ethyl Acetate, Acetonitrile,
The effects of substituents in the aryl fragment of the Z-arylhydrazones of 3-benzoyl-5-phenyl-1,2,4-oxadiazole (1) on the rate of the title reaction have been studied at 313.15 K.The results indicate a changeover of mechanism with changing substituent: i
Mononuclear Heterocyclic Rearrangements. Part 8. Substituent Effects on the Rate of Rearrangement of Some Arylhydrazones of 3-Benzoyl-5-phenyl-1,2,4-oxadiazole into 2-Aryl-4-benzoylamino-5-phenyl-1,2,3-triazoles, at pS+ 3.8-12.
The kinetic effects of substituents present in the aryl fragments on the title rearrangement have been studied in dioxan-water (1:1 v/v) in the range pS+ 3.8-12 and at various temperatures; the apparent activation parameters have been determine