Crotonic acid

Crotonic acid
Names
	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
CAS Number	107-93-7 ;
3D model (JSmol)	Interactive image; Interactive image;
ChEBI	CHEBI:41131 ;
ChEMBL	ChEMBL1213528 ;
ChemSpider	552744 ;
DrugBank	DB02074 ;
ECHA InfoCard	100.003.213
PubChem CID	637090;
UNII	YW5WZZ4O5Q ;
CompTox Dashboard (EPA)	DTXSID30880973 ;
	InChI InChI=1S/C4H6O2/c1-2-3-4(5)6/h2-3H,1H3,(H,5,6)/b3-2+ Key: LDHQCZJRKDOVOX-NSCUHMNNSA-N ; InChI=1/C4H6O2/c1-2-3-4(5)6/h2-3H,1H3,(H,5,6)/b3-2+ Key: LDHQCZJRKDOVOX-NSCUHMNNBH;
	SMILES C/C=C/C(O)=O; O=C(O)/C=C/C;
Properties
Chemical formula	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
Hazards
Safety data sheet (SDS)	SIRI.org
Related compounds
Other anions	crotonate
Related carboxylic acids	propionic acid; acrylic acid; butyric acid; succinic acid; malic acid; tartaric acid; fumaric acid; pentanoic acid; tetrolic acid
Related compounds	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). verify (what is ?) Infobox references

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. 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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