Definition

Noun: * An organic compound that is both aliphatic (having properties similar to open-chain hydrocarbons) and cyclic (containing a ring of atoms). The ring is typically composed of carbon atoms, but unlike aromatic compounds (e.g., benzene), it does not have a continuous, overlapping ring of p-orbitals and exhibits properties closer to alkanes or alkenes.

Usage

• The term classifies a major category of organic structures based on the type of carbon skeleton.
• It is used to distinguish these saturated or unsaturated non-aromatic ring systems from purely open-chain (acyclic) aliphatic compounds and from aromatic compounds.

Examples

• Cyclohexane is a simple .
• The chemist synthesized a novel with a five-membered ring.
• Many natural products, such as certain terpenes, contain in their structure.

Advanced Usage

• Bridged and Fused Rings: Complex can include bridged ring systems (like norbornane) or fused rings (like decalin), where multiple rings share atoms.
• Heterocyclic Analogues: While the classic definition involves carbon rings, the term is sometimes extended to non-aromatic rings containing heteroatoms (like oxygen or nitrogen) if their chemical behavior is aliphatic in nature.

Variants and Related Words

• Alicyclic (adjective): Describing the characteristic of such compounds.
  • Example: "The molecule has an alicyclic ring system."
• Cycloalkane (noun): A specific type of alicyclic compound where the ring contains only single bonds (saturated).
• Cycloalkene (noun): A specific type of alicyclic compound containing at least one carbon-carbon double bond within the ring.

Different Meanings

This term has a single, specific meaning in the field of organic chemistry. It does not have common alternative definitions in general language.

Synonyms

• Non-aromatic cyclic compound
• Aliphatic cyclic compound
• Carbocyclic compound (when specifying rings of only carbon atoms, and if non-aromatic)

Antonyms

• Acyclic compound (open-chain compound)
• Aromatic compound (e.g., benzene, pyridine)

Related Phrases / Collocations

• Alicyclic ring: Refers specifically to the cyclic portion of the molecule.
  • Example: "The reactivity is determined by the strain in the alicyclic ring."
• Alicyclic chemistry: The subfield of organic chemistry dealing with these compounds.
• Saturated alicyclic compound: An alicyclic compound with only single bonds in the ring (a cycloalkane).

Noun

1. an aliphatic compound that contains a ring of atoms