Tautomerism of heterocycles: five-membered rings with two

The Tautomerism of Heterocycles Five-Membered Rings with Two or More Heteroatoms... 

Minkin, V. I., Garnovskii, A. D., Elguero, J., Katritzky, A. R., Denisko, O., Tautomerism of Heterocycles Five-Membered Rings with Two or More Heteroatoms, 76, 159. 

Volume 13 of this serial publication comprises six chapters of which four deal with general accounts of compound classes 1-azirines (F. W. Fowler), phenanthridines (B. R. T. Keene and P. Tissington), tri-thiapentalenes (N. Lozac h), and heterocyclic ferrocenes (F. D. Popp and E. B. Moynahan). The other two chapters are concerned with particular aspects of the chemistry of groups of heterocyeles the tautomerism of purines (B. Pullman and A. Pullman) and quantitative aspects of the electrophilic substitution reactions of five-membered rings (G. Marino). 

Our survey of heteroaromatic tautomerism will be completed in three further chapters, two of which will appear in Volume 77 of our series covering the tautomerism of (i) rings with three, four, and seven or more members and (ii) two or more fused five- or six-membered heterocyclic rings. The final chapter dealing with the tautomerism of six-membered monocyclic ring systems will appear in a subsequent volume. 

The first two chapters in this volume continue the survey of heteroaromatic tautomerism that was the topic of Volume 76 of Advances in Heterocyclic Chemistry. This whole subject was first dealt with comprehensively in Volumes 1 and 2 of our series, which date back to 1963 and 1964. The area was updated in a special supplementary volume of the series that appeared in 1976 but is now seriously out of date. The chapters in Volume 76 deal with a general introduction and the tautomerism of five-membered monocyclic rings systems. 

---