six-membered
Học thuậtThân thiện
Definition
Adjective: - Having a ring structure composed of six atoms: Used specifically in chemistry to describe a molecule whose central structure is a closed ring containing exactly six atoms. These atoms can be of the same or different elements.
Usage Notes
- This term is a technical adjective used almost exclusively in organic and inorganic chemistry.
- It classifies cyclic compounds (compounds with ring structures) based on the size of the ring.
- It is typically placed before the noun it modifies (e.g., a six-membered ring).
Examples
- Adjective:
- Benzene is a classic example of a six-membered ring composed entirely of carbon atoms.
- The scientist synthesized a new six-membered heterocycle containing oxygen and nitrogen.
- Pyrimidine is a six-membered aromatic ring with two nitrogen atoms.
Advanced Usage
- The term is part of a systematic naming convention for ring sizes in chemistry. Other members include three-membered, four-membered, five-membered, etc.
- It can be hyphenated ("six-membered") or sometimes written without a hyphen in more technical contexts ("six membered ring"), though hyphenation is standard.
Variants and Related Words
- Ring size: A more general term for describing the number of atoms in a cyclic structure.
- Hexatomic ring: A less common but technically precise synonym, where "hexa-" means six.
- Cyclic compound: The broad category of compounds containing ring structures, which includes six-membered rings.
Synonyms
- Hexatomic (specifically for a ring of six atoms)
- Six-atom ring (a descriptive phrase)
Related Phrases / Terminology
- Six-membered heterocycle: A six-membered ring where at least one atom is not carbon (e.g., nitrogen, oxygen, sulfur).
- Six-membered carbocycle: A six-membered ring where all atoms are carbon.
- Saturated six-membered ring: A ring with only single bonds, like cyclohexane.
- Unsaturated six-membered ring: A ring containing double bonds, like benzene.
Adjective
- of a chemical compound having a ring with six members
- having three carbon and three nitrogen atoms in a six-membered ring