Structural Formula Vector Image
Title: Diacetyl
CAS Registry Number: 431-03-8
CAS Name: 2,3-Butanedione
Additional Names: biacetyl; dimethyl diketone; dimethylglyoxal; 2,3-diketobutane
Molecular Formula: C4H6O2
Molecular Weight: 86.09
Percent Composition: C 55.81%, H 7.02%, O 37.17%
Line Formula: CH3COCOCH3
Literature References: Found in bay and other oils; also in butter. Made from methyl ethyl ketone by converting to the isonitroso compd and then decomposing to diacetyl by hydrolysis with HCl; by special fermentation of glucose via methylacetylcarbinol: Suomalainen, Jännes, Nature 157, 336 (1946). Toxicity study: P. M. Jenner et al., Food Cosmet. Toxicol. 2, 327 (1964).
Properties: Yellowish-green liq; quinone odor; the vapors have a Cl-like odor. d1515 0.990. bp 88°. nD18 1.3933. Sol in ~4 parts water; misc with alcohol, ether. LD50 orally in rats: 1580 mg/kg (Jenner).
Boiling point: bp 88°
Index of refraction: nD18 1.3933
Density: d1515 0.990
Toxicity data: LD50 orally in rats: 1580 mg/kg (Jenner)
Use: Carrier of aroma of butter, vinegar, coffee, and other foods.

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