A set of empirical rules for certain formations of 3- to 7-membered rings. The predicted
pathways are those in which the length and nature of the linking chain enables the
terminal atoms to achieve the proper geometries for reaction. The disfavoured cases
are subject to severe distortions of bond angles and bond distances.
PAC, 1994, 66, 1077
(Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994))
on page 1088
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook