Patent ID: 7411095
Filing Date: 2008-08-12
Classification: C07C,C07D

Abstract:
1. A method of producing a highly pure compound having a formula (3) wherein R 1 and R 2 are the same or different and each represents a hydrogen atom, an unsubstituted C 1 -C 6 alkyl group, a C 1 -C 6 alkyl group substituted with at least one substituent selected from the group consisting of a Substituent group α and a Substituent group β, an unsubstituted C 6 -C 14 aryl group or a C 6 -C 14 aryl group substituted with at least one substituent from Substituent group α, R Substituent group α is selected from the group consisting of a hydroxyl group, a nitro group, a cyano group, a halogen atom, a C Substituent group β is selected from the group consisting of an unsubstituted C (a) reacting a compound having a formula (1) wherein R 1 and R 2 have the same meanings as those indicated hereinbefore, with a compound having a formula (2) wherein R 3 and R 4 have the same meanings as those indicated hereinbefore, wherein the compound of the formula (2) is in an amount which is more than one equivalent of the compound of the formula (1), (b) treating the resulting reaction mixture from step (a) with an acidic aqueous solution selected from the group consisting of a dilute aqueous solution of mineral acid and an aqueous solution of an organic acid, at a temperature between 0° C. and 30° C. and (c) carrying out a treatment on the resulting reaction mixture from step (b) with a basic aqueous solution.