Bicyclic molecule
chemical compound containing two rings conjoined (sharing at least one atom)
A bicyclic molecule (from bi 'two' and cycle 'ring') is a molecule that features two joined rings. Bicyclic structures occur widely, for example in many biologically important molecules like α-thujene and camphor. A bicyclic compound can be carbocyclic (all of the ring atoms are carbons), or heterocyclic (the rings' atoms consist of at least two elements), like DABCO. Moreover, the two rings can both be aliphatic (e.g. decalin and norbornane), or can be aromatic (e.g. naphthalene), or a combination of aliphatic and aromatic (e.g. tetralin).
Distinctive properties
Many properties of saturated bicyclic hydrocarbons are those of mono and acyclic analogues: colorless, combustible, and resistant to many reactions. Exceptions apply to the cyclopropane derivatives, which can undergo ring opening. The distinctive feature of the bicyclic compounds is their relative rigidity. Whereas only one stereoisomer exists for methylcycloheptane, seven are possible for methylnorbornane, including three pairs of enantiomers.
This brief starts where responsible research should: with the source description of “Bicyclic molecule” as chemical compound containing two rings conjoined (sharing at least one atom). Everything that follows is an evidence route, not borrowed authority.
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The subject matters to the science & nature register because the source frames it as chemical compound containing two rings conjoined (sharing at least one atom). Its deeper value depends on whether names, dates, institutions and citations support that framing.
Datasets, specimens, observations and peer-reviewed methods provide the appropriate test for the technical claims summarized here. The source revision retrieved here is dated May 7, 2026. The linked authority identifier is Q225972. The Library of Congress control number is sh85013914. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank.
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This entry incorporates text from “Bicyclic molecule” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.