Patent ID: 8440824

Claim:
A method which comprises: reacting a compound represented by the formula (I): wherein each of R 1 and R 2 is methyl, methoxy or ethoxy, and R 1 and R 2 may be the same or different from each other, with a compound represented by the formula (II): wherein each of X 1 and X 2 is a chlorine atom or —OCCl 3 , and X 1 and X 2 may be the same or different from each other in the presence of a pyridine compound and a basic compound selected from the group consisting of a chain aliphatic amine and a cyclic aliphatic amine, to produce a compound represented by the formula (III): wherein R 1 and R 2 are as defined above, a compound represented by the formula (IV): wherein R 1 and R 2 are as defined above, or their mixture.