Front Cover; Advances in Hetrocyclic Chemistry, Volume 1; Copyright Page; Contributors; Preface; Contents; Contents of Volume 2; Chapter 1. Recent Advances in the Chemistry of Thiophenes; Chapter 2. Reactions of Acetylenecarboxylic Acids and Their Esters with Nitrogen-Containing Heterocyclic Compounds; Chapter 3. Heterocyclic Pseudo Bases; Chapter 4. Aza Analogs of Pyrimidine and Purine Bases of Nucleic Acids; Chapter 5. Quinazolines; Chapter 6. Prototropic Tautomerism of Heteroaromatic Compounds: I. General Discussion and Methods of Study.