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| In ], a '''cyclic compound''' is a ] in which a series of |
In ], a '''cyclic compound''' is a, mostly organic, ] in which a series of atoms are connected to form a loop or ring.<ref>{{JerryMarch}}</ref> ] is a well known example. The term "polycyclic" is used when more than one ring is formed in a single molecule for instance in ], and the term ] is used for a ring containing more than a dozen atoms. | ||
| <gallery> | <gallery> | ||
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| Image:Naphthalene.png|Naphthalene, a simple polycyclic compound. | Image:Naphthalene.png|Naphthalene, a simple polycyclic compound. | ||
| Image:Porphyrin.svg|], a simple macrocyclic compound. | Image:Porphyrin.svg|], a simple macrocyclic compound. | ||
| File:Pentazole.png|], an inorganic cyclic compound. | |||
| </gallery> | </gallery> | ||
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| * A general type of polymerization reaction: ] | * A general type of polymerization reaction: ] | ||
| * ] | * ] | ||
| ⚫ | == External links == | ||
| ⚫ | * {{MeshName|Polycyclic+Compounds}} | ||
| ⚫ | * {{MeshName|Macrocyclic+Compounds}} | ||
| ==See also== | ==See also== | ||
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| *] | *] | ||
| *] | *] | ||
| ⚫ | == External links == | ||
| ⚫ | * {{MeshName|Polycyclic+Compounds}} | ||
| ⚫ | * {{MeshName|Macrocyclic+Compounds}} | ||
| == References == | == References == | ||
| <references/> | <references/> | ||
| ] | ] | ||
| ] | ] | ||
Revision as of 10:09, 25 June 2010
In chemistry, a cyclic compound is a, mostly organic, compound in which a series of 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 naphthalene, and the term macrocycle is used for a ring containing more than a dozen atoms.
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Benzene, a simple cyclic compound.
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Naphthalene, a simple polycyclic compound.
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Porphyrin, a simple macrocyclic compound.
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Pentazole, an inorganic cyclic compound.
Categorization
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
- Radical cyclization
Example of ring-opening reactions:
- A general type of polymerization reaction: Ring-opening polymerization
- Ring opening metathesis polymerisation
See also
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.