Patent ID: 6833481
Filing Date: 2004-12-21
Classification: C07C

Abstract:
A process for producing a 2-alkyl-2-cyclopentenone represented by the following general formula (2): (wherein R1, R2, R3, R4, R5, R6 and R7 each independently represents hydrogen atom, an alkyl group having 1 to 10 carbon atoms which may have one or more substituents or an aromatic group which may have one or more substituents, and each of (1) R6 or R7 with R3 and (2) R6 or R7 with R4 or R5 may be together combined to form a ring which may have a double bond), which comprises a step of dehydrative isomerization of a 2-(1-hydroxyalkyl)cyclopentanone represented by the following general formula (1): (wherein R1, R2, R3, R4, R5, R6 and R7 are the same as above) in the presence of a bromine compound and/or an iodine compound, wherein the amount of the bromine compound or iodine compound is from 0.0001 to 2.0% by weight in terms of bromine or iodine relative 2-(1-hydroxyalkyl)cyclopentanone represented by the formula (1).