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Names | |
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Preferred IUPAC name
(2E)-But-2-enoic acid | |
Other names
(E)-But-2-enoic acid
(E)-2-Butenoic acid Crotonic acid trans-2-Butenoic acid β-Methylacrylic acid 3-Methylacrylic acid | |
Identifiers | |
3D model (JSmol)
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ChEBI | |
ChEMBL | |
ChemSpider | |
DrugBank | |
ECHA InfoCard | 100.003.213 |
PubChem CID
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UNII | |
CompTox Dashboard (EPA)
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Properties | |
C4H6O2 | |
Molar mass | 86.090 g·mol−1 |
Density | 1.02 g/cm3 |
Melting point | 70 to 73 °C (158 to 163 °F; 343 to 346 K) |
Boiling point | 185 to 189 °C (365 to 372 °F; 458 to 462 K) |
Acidity (pKa) | 4.69 [1] |
Hazards | |
Safety data sheet (SDS) | SIRI.org |
Related compounds | |
Other anions
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crotonate |
Related carboxylic acids
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propionic acid acrylic acid butyric acid succinic acid malic acid tartaric acid fumaric acid pentanoic acid tetrolic acid |
Related compounds
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butanol butyraldehyde crotonaldehyde 2-butanone |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Crotonic acid ((2E)-but-2-enoic acid) is a short-chain unsaturated carboxylic acid described by the formula CH3CH=CHCO2H. The name crotonic acid was given because it was erroneously thought to be a saponification product of croton oil.[2] It crystallizes as colorless needles from hot water. With a cis-alkene, Isocrotonic acid is an isomer of crotonic acid. Crotonic acid is soluble in water and many organic solvents. Its odor is similar to that of butyric acid.
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