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Names | |||
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Preferred IUPAC name
2-Methylpropanoic acid[2] | |||
Other names
Isobutyric acid
2-Methylpropionic acid Isobutanoic acid | |||
Identifiers | |||
3D model (JSmol)
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3DMet | |||
ChEBI | |||
ChEMBL | |||
ChemSpider | |||
DrugBank | |||
ECHA InfoCard | 100.001.087 | ||
EC Number |
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KEGG | |||
PubChem CID
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RTECS number |
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UNII | |||
UN number | 2529 | ||
CompTox Dashboard (EPA)
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Properties | |||
C4H8O2 | |||
Molar mass | 88.11 g/mol | ||
Density | 0.9697 g/cm3 (0 °C) | ||
Melting point | −47 °C (−53 °F; 226 K) | ||
Boiling point | 155 °C (311 °F; 428 K) | ||
Acidity (pKa) | 4.86[3] | ||
-56.06x10−6 cm3/mol | |||
Hazards[4][5] | |||
GHS labelling: | |||
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Danger | |||
H226, H302, H311, H314 | |||
P210, P280, P301+P312+P330, P303+P361+P353, P305+P351+P338+P310 | |||
NFPA 704 (fire diamond) | |||
Flash point | 55 °C (131 °F; 328 K) | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Isobutyric acid, also known as 2-methylpropanoic acid or isobutanoic acid, is a carboxylic acid with structural formula (CH3)2CHCOOH. It is an isomer of butyric acid. It is classified as a short-chain fatty acid. Deprotonation or esterification gives derivatives called isobutyrates.
Isobutyric acid is a colorless liquid with a somewhat unpleasant odor. It is soluble in water and organic solvents. It is found naturally in carobs (Ceratonia siliqua), in vanilla, and in the root of Arnica dulcis, and as an ethyl ester in croton oil.[6]
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