Table of Contents1a. Compounds with three-membered heterocyclic rings: oxiranes, thiiranes, seleniranes (J. Kamal). 1b. Azirines, aziridines and related compounds (D.F. Ewing). 1c. Three-membered rings with two hetero atoms (E. Schmitz). 1d. Four-membered rings with one oxygen, sulfur, or selenium atom (E. Block, R.J. Linderman). 1e. Four-membered compounds containing a single nitrogen atom (T. Javed). 1f. Four-membered rings, containing a single heteroatom other than O, S, Se, Te, or N (D.W. Allen). 1g. Four-membered rings containing two or three heteroatoms (A.T. Hewson). 2. Furans, benzofurans, isobenzofurans, and their reduced forms (D.T. Hurst). 3. Thiophenes, hydrothiophenes, benzothiophenes, and related compounds (K.J. Hale, S. Manaviazar). 4. Pyrroles, pyrrolines and pyrrolidines (A.V. Patel, T.A. Crabb). 5. Indoles, isoindoles, their reduced derivatives and carbazoles (J.A. Joule). 6. Five-membered rings containing one hetero atom other than O, N or S (M. Scobie).