dihydric alcohol

Definition

Noun:
- Any of a class of alcohols having 2 hydroxyl groups in each molecule: A "dihydric alcohol" is a specific type of organic compound in chemistry. It is an alcohol, meaning it contains one or more hydroxyl (-OH) groups attached to a carbon atom. The prefix "di-" indicates two, and "hydric" relates to hydrogen or hydroxyl groups. Therefore, a dihydric alcohol is characterized by having exactly two hydroxyl (-OH) groups in its molecular structure.

Usage Examples

Noun:
- Ethylene glycol, a common antifreeze, is a well-known dihydric alcohol.
- The chemical formula of a simple dihydric alcohol like 1,2-ethanediol is C₂H₆O₂.
- In organic synthesis, a dihydric alcohol can serve as a starting material for polymers.

Advanced Usage

Chemical Nomenclature: In systematic IUPAC naming, dihydric alcohols are often called "diols." The simplest and most industrially significant dihydric alcohol is ethylene glycol (IUPAC name: ethane-1,2-diol).
- Glycerol is not a dihydric alcohol; it is a trihydric alcohol (triol) because it contains three hydroxyl groups.

Variants and Related Words

Diol (n): A synonym for dihydric alcohol in chemical terminology.
- Propylene glycol is a diol used in food and pharmaceutical products.
Glycol (n): A common term often used interchangeably with dihydric alcohol, especially for vicinal diols (where the two -OH groups are on adjacent carbon atoms).
- Ethylene glycol is sometimes simply referred to as 'glycol.'
Polyol (n): A more general term for alcohols containing multiple hydroxyl groups, which includes dihydric, trihydric, and other polyhydric alcohols.

Synonyms

Notes on Meaning

The term "dihydric alcohol" is precise and technical. It refers specifically to the molecular structure (two -OH groups) and not to common properties like being a beverage. These compounds are typically viscous, sweet-tasting liquids used as antifreeze agents, humectants, or chemical intermediates.

Noun

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