Title: Acetylacetone
CAS Registry Number: 123-54-6
CAS Name: 2,4-Pentanedione
Additional Names: diacetylmethane
Molecular Formula: C5H8O2
Molecular Weight: 100.12
Percent Composition: C 59.98%, H 8.05%, O 31.96%
Line Formula: CH3COCH2COCH3
Literature References: Made by the action of sodium on ethyl acetate and acetone or by the action of anhydrous aluminum chloride on acetyl chloride in the presence of an inert solvent: Combes, Compt. Rend. 103, 814 (1886); Ann. Chim. (Paris) 12, 199 (1887); Claisen, Ber. 38, 695 (1905); Hunt, US 2737528 (1956 to Shawinigan Chem.); Georgieff, US 2834811 (1958); Gattermann-Wieland, Praxis des Organischen Chemikers (de Gruyter, Berlin, 40th ed, 1961) p 219. Toxicity data: Carpenter, J. Ind. Hyg. Toxicol. 31, 343 (1949).
Properties: Colorless or slightly yellow, flammable liquid; pleasant odor. d 0.976. bp 140.5°. mp -23°. nD20 1.4512. One part dissolves in about 8 parts of water. Miscible with alcohol, benzene, chloroform, ether, acetone, glacial acetic acid. LC50 (4 hrs) in rats: 1000 ppm (Carpenter).
Melting point: mp -23°
Boiling point: bp 140.5°
Index of refraction: nD20 1.4512
Density: d 0.976
Toxicity data: LC50 (4 hrs) in rats: 1000 ppm (Carpenter)
CAUTION: Mild irritant to skin, mucous membranes.
Use: Forms organometallic complexes which are used as gasoline additives, lubricant additives, driers for varnishes and printer's inks, fungicides, insecticides, colors.

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