Established in 1960, Advances in Heterocyclic Chemistry is the definitive serial in the area-one of great importance to organic chemists, polymer chemists, and most biological scientists. Every fifth volume ofAdvances in Heterocyclic Chemistry contains a cumulative subject index.D.J. Lythgoe and C.A. Ramsden, 4-Unsubstituted, 5-Amino and 5-Unsubstituted, 4-Aminoinidazoles. B.A. Arbuzov and G.N. Nikonov, Phosphorous Heterocycles from (-Hydroxyalkylphosphines and Vinylphosphines. S. Radl, Mono- and Diazaquinones. E.S.H. El Ashry, N. Rashed, A. Mousaad, and E. Ramadan, Condensed 1,2,4-Triazines: II. Fused to Heterocycles with Six- and Seven-Membered Rings and Fused to Two Heterocyclic Rings.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 high standards of this series and provide a model for good publishing....The content is, alC#