Some new strategies for protection, activation and direction in lithiation chemistry, A R Katritzky, G W Rewcastle, J N Lam & S Sengupta, USA. Recent applications of the inverse electron demand Diels-Alder reaction, D L Boger & M Patel, USA. Biotransformations relating to heterocyclic compounds, S M Roberts, UK. Three-membered ring systems, A Padwa & R L Chinn, USA. Four-membered ring systems, R C Storr, UK. Five-membered ring systems: Pt.1, Thiophenes & Se & Te analogs, S Gronowitz & A B Hornfeldt, Sweden. Pt.2, Pyrroles & benzo derivatives, R J Sundberg, USA. Pt.3, Furans & benzo derivatives, C W Bird, UK. Pt.4, With more than one N atom, K T Potts, USA. Pt.5, With N & S (Se) atoms, I Shinkai, USA. Pt.6, With O & S (Se, Te) atoms, J G Keay, USA. Pt.7, With O & N atoms, G V Boyd, Israel. Six-membered ring systems: Pt.1, Pyridine & benzo derivatives, D T Hurst, UK. Pt.2, Diazines & benzo derivatives, T J Kress, USA. Pt.3, Triazines & tetrazines & fused systems, D T Hurst, UK. Pt.4, With O and/or S atoms, J D Hepworth, UK. Seven-membered rings, N P Peet, USA. Eight-membered & larger rings, G R Newkome, USA. Subject index.