hydroxy

Thân thiện

A chemist draws the hydroxy group on a whiteboard.

Definition

1. Adjective:
   • Being or containing a hydroxyl group: In chemistry, "hydroxy" describes a molecule or radical that contains one or more hydroxyl groups (-OH), which consist of an oxygen atom bonded to a hydrogen atom.

Usage

• The term "hydroxy" is used almost exclusively as a combining form or prefix in chemical nomenclature. It is not typically used as a standalone word in general language but as part of a larger compound name to indicate the presence of a hydroxyl functional group.
• It modifies the name of a compound to specify its chemical structure.

Examples

• Adjective (as a combining form):
  • The molecule is a hydroxy acid, meaning it contains both a carboxylic acid group and a hydroxyl group.
  • Ethanol has a hydroxy group attached to a carbon chain.

Advanced Usage

• In IUPAC Nomenclature: In systematic chemical naming, "hydroxy-" is used as a prefix to denote a substituent -OH group on a parent structure.
  • The compound 2-hydroxypropanoic acid is more commonly known as lactic acid.
• In Biochemistry: Frequently appears in the names of biologically important molecules like steroids, vitamins, and acids.
  • 25-hydroxyvitamin D is a crucial metabolite for calcium absorption.

Variants and Related Words

• Hydroxyl (noun): Refers specifically to the functional group (-OH) itself.
  • The hydroxyl group is highly polar.
• Hydroxide (noun): A chemical compound containing the OH⁻ ion (e.g., sodium hydroxide, NaOH).
• Dihydroxy-: A prefix indicating the presence of two hydroxyl groups.
• Polyhydroxy-: A prefix indicating the presence of many hydroxyl groups.

Synonyms

• -ol (suffix): In organic chemistry, the suffix "-ol" often indicates an alcohol, which contains a hydroxyl group (e.g., methanol, ethanol). While not a direct synonym, it serves a similar descriptive function for a major class of hydroxy compounds.

Notes on Meaning

• The word "hydroxy" has a single, precise meaning in scientific contexts related to chemistry and biochemistry. It does not have idiomatic or figurative uses.

Học thuật

Adjective

1. being or containing a hydroxyl group