Patent ID: 7557148

Claim:
A novel cycloalkenylcarboxylic acid represented by the following formula [V] or a salt thereof: wherein R 1 is a 3-methyl-2-butenyl group or a 2-methyl-1-propenyl group, when R 1 is a 3-methyl-2-butenyl group, R 2 is a methyl group and R 3 and R 4 are each a hydrogen atom, when R 1 is a 2-methyl-1-propenyl group, R 2 is a hydrogen atom and R 3 and R 4 are each a methyl group, R 5 and R 6 are each a hydrogen atom or an alkyl group of 1 to 10 carbon atoms, m and n are each a number of 0 or 1 (with the proviso that it does not occur that m and n are 0 at the same time), R 7 and R 8 are each a hydrogen atom or a hydrocarbon group, when m is 0, R 7 is a hydrogen atom, when m is 1, R 7 is a hydrogen atom or a hydrocarbon group, when n is 0, R 8 is a hydrogen atom, when n is 1, R 8 is a hydrogen atom or a hydrocarbon group, with the proviso that R 7 and R 8 are not both hydrocarbon groups, when R 1 is a 2-methyl-1-propenyl group, R 2 is a hydrogen atom, R 3 and R 4 are each a methyl group and m=1, n=0, R 5 is an alkyl group of 1 to 10 carbon atoms, R 6 , R 7 and R 8 are each a hydrogen atom, and when R 1 is a 2-methyl-1-propenyl group, R 2 is a hydrogen atom, R 3 and R 4 are each a methyl group and m=0, n=1, R 6 is an alkyl group of 1 to 10 carbon atoms, R 5 , R 7 and R 8 are each a hydrogen atom.