Isobutyric Acid
Title: Isobutyric Acid
CAS Registry Number: 79-31-2
CAS Name: 2-Methylpropanoic acid
Additional Names: isopropylformic acid
Molecular Formula: C4H8O2
Molecular Weight: 88.11
Percent Composition: C 54.53%, H 9.15%, O 36.32%
Line Formula: (CH3)2CHCOOH
Literature References: Prepn from 1-nitroisobutane: Lippincott, Hass, Ind. Eng. Chem. 31, 118 (1939); from methallyl chloride: Towle, Hall, US 2667508 (1954 to Standard Oil Co. of Indiana); from propylene: Alderson, US 3020314 (1962 to du Pont); from 2-methylpropane + CO with HF catalyst: Friedman, Cotton, J. Org. Chem. 27, 481 (1962).
Properties: Liquid; pungent odor like that of butyric acid, but not as unpleasant. bp760 152-155°. mp -47°. d420 0.950. nD20 1.3930. Flash pt, open cup: 170°F (77°C). Sol in 6 parts of water; misc with alcohol, chloroform, ether.
Melting point: mp -47°
Boiling point: bp760 152-155°
Flash point: Flash pt, open cup: 170°F (77°C)
Index of refraction: nD20 1.3930
Density: d420 0.950
CAUTION: Mild irritant.

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