Title: Aldol
CAS Registry Number: 107-89-1
CAS Name: 3-Hydroxybutanal
Additional Names: 3-hydroxybutyraldehyde; acetaldol
Molecular Formula: C4H8O2
Molecular Weight: 88.11
Percent Composition: C 54.53%, H 9.15%, O 36.32%
Line Formula: CH3CH(OH)CH2CHO
Literature References: Manuf by condensation of acetaldehyde in aq NaOH: Alhéritière, Gobron, US 2713598 (1955 to Usines de Melle). Toxicity study: H. F. Smyth et al., J. Ind. Hyg. Toxicol. 31, 60 (1949).
Properties: Colorless, thick liquid. d16 1.109. bp20 83°; dec about 85°. Miscible with water, alcohol, ether. LD50 orally in rats: 2.18 g/kg (Smyth).
Boiling point: bp20 83°
Density: d16 1.109
Toxicity data: LD50 orally in rats: 2.18 g/kg (Smyth)
Use: Manuf rubber vulcanizers, accelerators and age resisters; in perfumes; ore flotation.
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Generalized structure of the aldol moiety: When R3 is -H, it is a β-hydroxy aldehyde, otherwise it is a β-hydroxy ketone.

An aldol or aldol adduct (from "Aldehyde alcohol") is a beta-hydroxy ketone or aldehyde, and is the product of aldol addition (as opposed to aldol condensation, which produces an α,β-unsaturated carbonyl moiety).

Typically, "aldol" refers to 3-hydroxybutanal. However, it may refer to any compound of similar base structure.