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:
 * C5H8 + CO  +  H2O  ->  C5H9CO2H

An alternative route involves base-induced ring contraction of 2-chlorocyclohexanone to give the ester methyl cyclopentanecarboxylate, which can be hydrolyzed to the carboxylic acid.