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| ==Ring-closing & opening reactions == | == Ring-closing & opening reactions == | ||
| Related concepts in organic chemistry are so-called '''ring-closing reactions''' in which a cyclic compound is formed and '''ring-opening reactions''' in which rings are opened. | Related concepts in organic chemistry are so-called '''ring-closing reactions''' in which a cyclic compound is formed and '''ring-opening reactions''' in which rings are opened. | ||
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| * ] | * ] | ||
| ==External links== | == External links == | ||
| * {{MeshName|Polycyclic+Compounds}} | * {{MeshName|Polycyclic+Compounds}} | ||
| * {{MeshName|Macrocyclic+Compounds}} | * {{MeshName|Macrocyclic+Compounds}} | ||
| ==References== | == References == | ||
| <references/> | |||
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| ] | ] | ||
Revision as of 13:39, 10 February 2008
In organic chemistry, a cyclic compound is a compound in which a series of carbon atoms are connected to form a loop or ring . Benzene is a well known example.
The term "polycyclic" is used when more than one ring is formed in a single molecule for instance in naphtalene, and the term macrocycle is used for a ring containing more than a dozen atoms.
Cyclic compounds can be categorized:
Ring-closing & opening reactions
Related concepts in organic chemistry are so-called ring-closing reactions in which a cyclic compound is formed and ring-opening reactions in which rings are opened.
Examples of ring-closing reactions:
- Ring-closing metathesis
- Nazarov cyclization reaction
- Ruzicka large ring synthesis
- Dieckmann condensation
- Wenker synthesis
Example of ring-opening reactions:
- A general type of polymerization reaction: Ring-opening polymerization
- Ring opening metathesis polymerisation
External links
- Polycyclic+Compounds at the U.S. National Library of Medicine Medical Subject Headings (MeSH)
- Macrocyclic+Compounds at the U.S. National Library of Medicine Medical Subject Headings (MeSH)
References
- March, Jerry (1985). Advanced Organic Chemistry: Reactions, Mechanisms, and Structure (3rd ed.). New York: Wiley. ISBN 9780471854722. OCLC 642506595.