(from preface)
Volume 13 of this serial publication comprises six chapters of which four deal with general accounts of compound classes: 1-azirines (F. W. Fowler), phenanthridincs (B. R. T. Keene and P. Tissington), tri-thiapentalenes (N. Lozac'h), and heterocyclic fcrrocenes (F. D. Popp and E. B. Moynahan). The other two chapters are concerned with particular aspects of the chemistry of groups of heterocycles: the tautomerism of purines (B. Pullman and A. Pullman) and quantitative aspects of the electrophilic substitution reactions of five-membercd rings (G. Marino).