Chemical compound containing two hydroxyl (–OH) groups
Ethylene glycol, a common diol
A diol is a chemical compound containing two hydroxyl groups (−OH groups).[1] An aliphatic diol may also be called a glycol.[2] This pairing of functional groups is pervasive, and many subcategories have been identified. They are used as protecting groups of carbonyl groups, making them essential in synthesis of organic chemistry.[3]
The most common industrial diol is ethylene glycol. Examples of diols in which the hydroxyl functional groups are more widely separated include 1,4-butanediol HO−(CH2)4−OH and propylene-1,3-diol, or beta propylene glycol, HO−CH2−CH2−CH2−OH.
^March, Jerry (1985), Advanced Organic Chemistry: Reactions, Mechanisms, and Structure, 3rd edition, New York: Wiley, ISBN 9780471854722, OCLC 642506595.
^IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (1997). Online corrected version: (2006–) "diols". doi:10.1351/goldbook.D01748.
^"Carbonyl Protecting Groups - Stability". www.organic-chemistry.org. Retrieved 2024-04-15.
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