Established in 1960, Advances in Heterocyclic Chemistry is the definitive serial in the area-one of great importance to organic chemists, polymer chemists, and many biological scientists. Every fifth volume ofAdvances in Heterocyclic Chemistry contains a cumulative subject index.I.D. Sadekov and V.I. Minkin, Six-Membered Heterocycles with a Tellurium Atom. A. Chimirri, R. Gitto, S. Grasso, A.M. Monforte, and M. Zappala, Annelated 1,5-Benzothiazepines. I. Hermecz, Recent Developments in the Chemistry of Pyrido[1,2-a]pyrimidines. A.S. Shawali and M.A. Abdallah, The Chemistry of Heterocyclic Hydrazonoyl Halides. J. Sepulveda-Arques, B. Abarca-Gonzalez, and M. Medio-Simon, Cycloaddition Reactions with Vinyl Heterocycles.Chapter References.Alan Katritzky was educated at Oxford and has held faculty positions at Cambridge and East Anglia before he migrated in 1980 to the University of Florida, where he was Kenan Professor and Director for the Institute for Heterocyclic Compounds. During his career he has trained more than 1000 graduate students and post-docs, and lectured and consulted world-wide. He led the team, which produced Comprehensive Heterocyclic Chemistry? and its sequels, CHEC-II and CHEC-III?, has edited Advances in Heterocyclic Chemistry, Vols. 1 through 111? and conceived the plan for Comprehensive Organic Functional Group Transformations?. He founded Arkat-USA, a non-profit organization which publishes Archive for Organic Chemistry? (ARKIVOC) an electronic journal completely free to authors and readers at (www.arkat-usa.org). Honors include 14 honorary doctorates from 11 countries and membership of foreign membership of the National Academies of Britain, Catalonia, India, Poland, Russia and Slovenia. The typesetting, arrangement of references, and drafting of structural formulas adhere to the highl<