1. The literature is covered until June 1982, in few cases later references are included. Previous reviews on this topic or parts of it are: R. W. Hoffmann: Dehydrobenzene and Cycloalkynes, Verlag Chemie, Weinheim 1967
2. A. Krebs: Cyclic Acetylenes, in: Chemistry of Acetylenes, (Ed. H. G. Viehe), Marcel Dekker, New York 1969, p. 987
3. M. Nakagawa: Cyclic Acetylenes, in: The Chemistry of the carbon-carbon triple bond, (Ed. S. Patai), J. Wiley & Sons, New Aork 1978, p. 635
4. H. Meier, Synthesis 1972, 235.
5. P. Saxe, H. F. Schaefer III: J. Am. Chem. Soc. 102, 3239 (1980)