Crotonic acid
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| Crotonic acid | |
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| Chemical name | (E)-2-butenoic acid |
| Other names | trans-2-butenoic acid beta-methylacrylic acid 3-methylacrylic acid |
| Chemical formula | C4H6O2 |
| Molecular mass | 86.09 g/mol |
| CAS number | [107-93-7] |
| Density | 1.02 g/cm3 |
| Melting point | 70-73 °C |
| Boiling point | 185-189 °C |
| SMILES | C/C=C/C(O)=O |
| Disclaimer and references | |
Crotonic acid, or trans-2-butenoic acid, is a short-chain unsaturated carboxylic acid. Crotonic acid is so named from the fact that it was erroneously thought to be a saponification product of croton oil. It crystallizes in needles from hot water: the crystals melt at 72 °C and boil at 185-189 °C.
Isocrotonic acid (or quartenylic acid) is the cis isomer of crotonic acid. It is an oil, possessing a smell like that of brown sugar. It boils at 171.9 °C, with partial conversion into crotonic acid; the transformation is complete when the acid is heated to 170-180 °C in a sealed tube.
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This article incorporates text from the Encyclopædia Britannica Eleventh Edition, a publication now in the public domain.
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