The term originally applied to compounds having two p
-phenylene groups held face to face by
bridges. It now designates compounds having (i) mancude-ring systems
, or assemblies of mancude-ring systems
, and (ii) atoms and/or saturated or unsaturated chains as alternate components of
a large ring. E.g. [2.2](1,4)(1,4)cyclophane [or 1(1,4),4(1,4)-dibenzenacyclohexaphane].
Many chemists include in this class any bridged aromatic system, irrespective of the
positions of the bridge
PAC, 1995, 67, 1307
(Glossary of class names of organic compounds and reactivity intermediates based on
structure (IUPAC Recommendations 1995))
on page 1330
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. https://doi.org/10.1351/goldbook