7-membered

Thân thiện

A chemist draws the structure of a 7-membered ring on a whiteboard.

Definition

1. Adjective:
   • Having a ring structure composed of seven atoms: The term "7-membered" specifically describes a chemical compound whose molecular structure contains a single ring formed by exactly seven atoms. These atoms are typically carbon, but can include heteroatoms like oxygen or nitrogen. The ring can be saturated, unsaturated, or aromatic.

Usage

• The adjective "7-membered" is used attributively, almost exclusively before a noun to classify the type of ring in a molecule.
• It is a technical term primarily used in organic chemistry and related scientific fields.

Examples

• Attributive Use:
  • The synthesis of a stable 7-membered ring was a significant achievement.
  • Azepine is a classic example of a 7-membered heterocyclic compound containing nitrogen.

Advanced Usage

• The term is part of a systematic naming convention for ring sizes (e.g., 3-membered, 5-membered, 6-membered).
• It describes the ring size only, not the specific chemical properties, which depend on the atoms present and their bonding (e.g., a 7-membered lactone vs. a 7-membered cycloalkane).

Variants and Related Words

• Seven-membered: A hyphenated variant with the same meaning.
• Heptatomic ring: A more formal, less common synonym focusing on the seven-atom count.
• Cycloheptane: The name for the simple saturated hydrocarbon with a 7-membered carbon ring.
• Ring size: The general property that "7-membered" specifies.

Synonyms

• Seven-membered: The direct synonym, identical in meaning and usage.
• Heptatomic (for the ring itself): Pertaining to a group of seven atoms.

Notes

• "7-membered" is a hyphenated compound adjective. The numeral "7" is used in scientific contexts, though "seven-membered" is also acceptable.
• Do not confuse with terms describing the number of members in a group or team; in chemistry, "membered" refers exclusively to atoms in a ring structure.
• There are no specific idioms or phrasal verbs associated with this technical term.

Học thuật

Adjective

1. of a chemical compound having a ring with seven members

Từ đồng nghĩa

• seven-membered