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Tautomerism In azoles

Both tautomers at RT (unusual) Both tautomers on cooling (Kt) Annular tautomerism in azoles (AG and 4G )... [Pg.44]

The largest series of papers (third column) is related to the study of annular tautomerism in azoles. This class of tautomerism is especially well suited for DNMR because in many cases Kt = 1 (autotrope) and because the activation barriers are in the range easy to be measured by NMR. To... [Pg.44]

Occurrence of the methyl-methylene tautomerism in azoles needs a strong electron-withdrawing substituent attached to the methyl group. [Pg.252]

Bensaude et al. (78T2259) have used T-jump relaxation spectrophotometry to determine the rates of protonation and deprotonation of 3(5)-methyl-5(3)-phenylpyrazole anion (416") and cation (416H ), respectively. This study is a fundamental cornerstone in understanding annular tautomerism in azoles. The nondissociative intramolecular proton transfer in azoles is not observed (78T2259 86BSF429). [Pg.219]

See other pages where Tautomerism In azoles is mentioned: [Pg.848]   
See also in sourсe #XX -- [ Pg.848 ]



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