4-membered

Thân thiện

A chemist draws the structure of a 4-membered ring compound on a whiteboard.

Definition

1. Adjective:
   • Having a ring structure consisting of four atoms: The term "4-membered" specifically describes a chemical compound whose molecular structure contains a ring (a cyclic structure) formed by exactly four atoms. This is a precise technical descriptor in chemistry.

Usage

• The adjective "4-membered" is used attributively, almost exclusively before a noun (like "ring" or "compound"). It is a hyphenated compound adjective formed from a number and a noun.
• It is a specialized term found in scientific literature, particularly in organic chemistry and related fields.

Examples

• Attributive use:
  • Oxetane is a 4-membered cyclic ether. (Here, "4-membered" modifies the noun phrase "cyclic ether" to specify the size of the ring.)
  • The synthesis of strained 4-membered rings is a challenging area of research.
  • This reaction proceeds through a 4-membered transition state.

Advanced Usage

• The pattern "[number]-membered" is a standard way to denote ring size in chemical nomenclature (e.g., 3-membered, 5-membered, 6-membered).
• It can refer to rings composed of any combination of atoms (e.g., carbon, oxygen, nitrogen), as long as the total count in the ring is four.

Variants and Related Words

• Four-membered: A less common, non-numeric variant with the same meaning.
• Tetratomic ring: A more technical synonym, though "tetratomic" can sometimes imply four atoms of the same element, while "4-membered" is more general.
• Cyclobutane: An example of a specific 4-membered organic compound (C₄H₈).

Synonyms

• Four-atom ring (descriptive phrase)
• Tetrameric ring (in specific contexts, though "tetramer" often refers to four linked monomers)

Notes

• "4-membered" is a fixed hyphenated adjective. It is not typically used predicatively (e.g., "The ring is 4-membered" is grammatically possible but less common in standard prose than the attributive use).
• This term is highly domain-specific and would not be used in everyday language.

Học thuật

Adjective

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

Từ đồng nghĩa

• four-membered