open-chain

Thân thiện

The chemist points to an open-chain molecule model on the laboratory table.

Definition

Adjective: * Having an open chain structure: In chemistry, this describes a molecule whose atoms are connected in a straight or branched sequence, rather than forming a closed ring. This is the opposite of a cyclic or closed-chain structure.

Usage

The term "open-chain" is a technical adjective used almost exclusively in organic chemistry to classify and describe the structure of carbon compounds. It is typically placed before a noun or used as a predicate adjective.

Examples

• As an adjective before a noun:
  • Saturated hydrocarbons are open-chain alkanes.
  • Glucose can exist in both cyclic and open-chain forms.
• As a predicate adjective:
  • The molecule's structure is open-chain.
  • Unlike benzene, this compound is open-chain.

Advanced Usage

• The concept is fundamental for distinguishing between major classes of organic compounds, such as aliphatic (typically open-chain) and aromatic (cyclic) compounds.
• In biochemistry, the interconversion between the open-chain and cyclic forms of sugars is a key concept in understanding their reactivity.

Variants and Related Words

• Acyclic (adjective): A direct synonym meaning "not cyclic" or "having an open-chain structure."
• Aliphatic (adjective): Often used to describe open-chain and non-aromatic hydrocarbons, though it can include some cyclic compounds that behave similarly to open-chain ones (e.g., cycloalkanes).
• Closed-chain (adjective): The direct antonym, describing a cyclic or ring structure.
• Cyclic (adjective): The more common antonym, meaning arranged in a ring.

Synonyms

• Acyclic
• Non-cyclic
• Linear or branched (these describe specific types of open-chain structures)

Antonyms

• Closed-chain
• Cyclic
• Ring

Học thuật

Adjective

1. having an open chain structure

Từ đồng nghĩa

• acyclic