Patent ID: 7227044

Claim:
A process for producing a cycloalkanone composition comprising a cycloalkanone represented by formula (1) in an amount of 70 wt % or more based on the composition, wherein the content of a dimer of a cycloalkanone represented by formula (2) is 0.055 or less in terms of weight ratio to the cycloalkanone (1), in which said process comprises: reacting the cycloalkanone represented by formula (2) with an aldehyde or ketone represented by formula (3) by aldol condensation in the presence of water and a basic catalyst at a mole ratio of water/compound of formula (3) of 1.5/1 to 5.5/1, wherein n is an integer of 1 or 2, R 1 and R 2 independently represent a hydrogen atom, a C1 to C8 linear or branced alkyl grou or a substituted or unsubstituted aryl group.