Boron Heterocycles as Platforms for Building New Bioactive Agents (M.P. Groziak). Heterocyclic Phosphorus Ylides (R.A. Aitken and T. Massil). Palladium Chemistry in Pyridine Alkaloid Synthesis (J.J. Li). Three- and Four-Membered Ring Systems. Three-Membered Ring Systems (A. Padwa and S.S. Murphree). Four-Membered Ring Systems (L.K. Mehta and J. Parrick). Five-Membered Ring Systems. Thiophenes & Se, Te, Analogs (E.T. Pelkey). Pyrroles and Benzo Derivatives (D.M. Ketcha). Furans and Benzofurans (S. Greve and W. Friedrichsen). With More than One N Atom (L. Yet). With N & S (Se) Atoms (P.A. Bradley and D.J. Wilkins). With O & S (Se, Te) Atoms (R.A. Aitken). With O & N Atoms (T.L. Gilchrist). Six-Membered Ring Systems. Pyridines and Benzo Derivatives (R.D. Larsen and J.-F. Marcoux). Diazines and Benzo Derivatives (B.R. Lahue and J.K. Snyder). Triazines, Tetrazines and Fused Ring Polyaza Systems (C. Ochoa and P. Goya). With O and/or S Atoms (J. D. Hepworth and B.M. Heron). Seven-Membered Rings (D.J. LeCount). Eight-Membered and Larger Rings (G.R. Newkome).