Cyclopentanecarboxylic acid

Cyclopentanecarboxylic acid is an organic compound with the formula C₅H₉CO₂H. It is a colorless nonvolatile oil. It can be produced by the palladium-catalyzed hydrocarboxylation of cyclopentene:^[2]

C₅H₈ + CO + H₂O → C₅H₉CO₂H

Cyclopentanecarboxylic acid

Identifiers
CAS Number	3400-45-1
3D model (JSmol)	Interactive image
ChEMBL	ChEMBL1902018
ChemSpider	17789
ECHA InfoCard	100.020.245
EC Number	222-269-5
PubChem CID	18840
UNII	Z6691VH94A
CompTox Dashboard (EPA)	DTXSID70187610
InChI InChI=1S/C6H10O2/c7-6(8)5-3-1-2-4-5/h5H,1-4H2,(H,7,8) Key: JBDSSBMEKXHSJF-UHFFFAOYSA-N
SMILES C1CCC(C1)C(=O)O
Properties
Chemical formula	C6H10O2
Molar mass	114.144 g·mol−1
Appearance	colorless oil
Density	1.0510 g/cm3
Melting point	−7 °C (19 °F; 266 K)
Boiling point	212 °C (414 °F; 485 K)
Hazards
GHS labelling:[1]
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H335
Precautionary statements	P261, P264, P264+P265, P271, P280, P302+P352, P304+P340, P305+P351+P338, P319, P321, P332+P317, P337+P317, P362+P364, P403+P233, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

An alternative route involves the Favorskii rearrangement, which is a base-induced ring contraction of 2-chlorocyclohexanone to give the ester methyl cyclopentanecarboxylate, which can be hydrolyzed to the carboxylic acid.^[3]