Isocrotonic acid

Isocrotonic acid (also known as quartenylic acid; formally named (Z)-2-butenoic acid) is the cis isomer of crotonic acid. It is an oil, possessing an odor similar to that of brown sugar. At its boiling point of 171.9 °C, it converts into crotonic acid. The compound can be prepared from 1,3‑dibromo-2‑butanone via the Favorskii rearrangement.

Isocrotonic acid
Names
Preferred IUPAC name
(2Z)-But-2-enoic acid
Other names
(Z)-But-2-enoic acid
(Z)-2-Butenoic acid
cis-2-Butenoic acid
cis-β-Methylacrylic acid
(Z)-β-Methylacrylic acid
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.007.249
EC Number
  • 207-973-2
PubChem CID
UNII
  • InChI=1S/C4H6O2/c1-2-3-4(5)6/h2-3H,1H3,(H,5,6)/b3-2- N
    Key: LDHQCZJRKDOVOX-IHWYPQMZSA-N N
  • InChI=1/C4H6O2/c1-2-3-4(5)6/h2-3H,1H3,(H,5,6)/b3-2-
    Key: LDHQCZJRKDOVOX-IHWYPQMZBE
SMILES
  • C/C=C\C(=O)O
Properties
C4H6O2
Molar mass 86.090 g·mol−1
Density 1.03 g·cm−3
Melting point 12.5–14 °C (54.5–57.2 °F; 285.6–287.1 K)
Boiling point 168 to 169 °C (334 to 336 °F; 441 to 442 K)
Related compounds
Crotonic acid (trans isomer)
Angelic acid
Senecioic acid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
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