Patent ID: 8293926

Claim:
A method comprising dissolving or dispersing a compound of the formula (IIIa): (wherein, n represents an integer of 0 to 3, R 1 represents a halogen atom, alkyl group, alkoxy group, haloalkyl group and cycloalkyloxy group, when n is 2 or 3, R 1 s may be the same or different, or when n is 2 or 3, two R 1 s together form an alkylenedioxy group, R 2 represents an alkyl group) or a compound of the formula (IIIb): (wherein, R 1 , R 2 and n have the same meanings as described above) in a solvent, and adding the resultant solution or dispersion to an acid, to produce a compound of the formula (Va): (wherein, R 1 , R 2 and n have the same meanings as described above); and wherein the reduction of a compound of the formula (IIa) or a compound of the formula (IIb) is catalytic hydrogen reduction in the presence of a developed nickel containing iron.