In organic chemistry, a cyclic compound is a compound in which a series of carbon atoms are connected to form a loop or ring.^[1] 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.

<gallery> Image:Benzene bonds.svg|Benzene, a simple cyclic compound. Image:Naphthalene.png|Naphthalene, a simple polycyclic compound. Image:Porphyrin.svg|Porphyrin, a simple macrocyclic compound. </gallery>

Cyclic compounds can be categorized:

• Alicyclic compound
  • Cycloalkane
  • Cycloalkene
• Aromatic hydrocarbon
  • Polycyclic aromatic hydrocarbon
• Heterocyclic compound
• Macrocycle

Cyclic aldehydes are aldehydes that have their -CHO group bonded directly to the ring. The suffix is -carbaldehyde or carboxaldehyde.

Ring-closing & opening reactions

Dieckman ring-closing reaction

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

References

1. ↑

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