Content: Chapter 18 Recent developments on nitrile oxides, nitrile sulphides and nitrile selenides (pages 737–804): Giorgio Bianchi, Remo Gandolfi and Paolo Grunanger Chapter 19 Conformation of cyano and isocyano compounds (pages 805–834): C. A. Kingsbury Chapter 20 Recent advances in isocyanide chemistry (pages 835–887): H. M. Walborsky and M. P. Periasamy Chapter 21 Complexation of aryldiazonium ions by polyethers (pages 889–915): Richard A. Bartsch Chapter 22 Poly(diacetylenes) and polyyne polymers containing transition?metal atoms in the main chain (pages 917–980): William D. Huntsman Chapter 23 Cyclodimerization of alkynes and reactivity of aluminium halide ? complexes of cyclobutadienes (pages 981–1013): Hepke Hogeveen and Douwe M. Kok Chapter 24 Structure of triple?bonded molecules (pages 1015–1034): J. B. Moffat Chapter 25 NMR spectra of acetylenes (pages 1035–1056): D. G. Morris Chapter 26 Preparation and synthetic applications of cyano compounds (pages 1057–1303): Alexander J. Fatiadi Chapter 27 General and theoretical properties of triple?bonded molecules (pages 1305–1343): J. B. Moffat Chapter 28 Recent advances in the synthesis of triple?bonded groups (pages 1345–1390): Klaus Friedrich