Cyclopropane carboxylic acid

Cyclopropane carboxylic acid is the organic compound with the formula C₃H₅CO₂H. It is the carboxylic acid derivative of cyclopropane. It can be prepared by hydrolysis of cyanocyclopropane, which is obtained by base-induced cyclization of 4-chlorobutyronitrile.^[1]

Cyclopropane carboxylic acid

Identifiers
CAS Number	1759-53-1
3D model (JSmol)	Interactive image
Beilstein Reference	969839
ChEBI	CHEBI:23500
ChEMBL	ChEMBL4649900
ChemSpider	14890
ECHA InfoCard	100.015.602
EC Number	217-162-5
Gmelin Reference	2246
KEGG	C16267
PubChem CID	15655
UNII	008803351S
CompTox Dashboard (EPA)	DTXSID1040665
InChI InChI=1S/C4H6O2/c5-4(6)3-1-2-3/h3H,1-2H2,(H,5,6) Key: YMGUBTXCNDTFJI-UHFFFAOYSA-N
SMILES C1CC1C(=O)O
Properties
Chemical formula	C4H6O2
Molar mass	86.090 g·mol−1
Appearance	colorless oil
Density	1.0829 g/cm3
Melting point	18.5 °C (65.3 °F; 291.6 K)
Boiling point	76 °C (169 °F; 349 K) 12 Torr
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H302, H314
Precautionary statements	P260, P264, P264+P265, P270, P280, P301+P317, P301+P330+P331, P302+P361+P354, P304+P340, P305+P354+P338, P316, P317, P321, P330, P363, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Reactions

Cyclopropane carboxylic acid has al pKa of 4.65, fairly typical for similar compounds.^[2] Esterification is conveniently done with Lewis acid catalysts.^[3]

The compound has been used to probe the biosynthesis of ethylene.^[4]