3,4-dialkylbiphenyldicarboxylic acid compound, 3,4-dicarboalkoxybiphenyl-3′,4′-dicarboxylic acid and corresponding acid anhydrides, and processes for producing these compounds

摘要

3,4-Dicarboalkoxybiphenyl-3′,4′-dicarboxylic acid represented by the general formula (1):;
in which R11 and R12 each represents an alkyl group having 1 to 4 carbon atoms, and n represents the number of waters of hydration that is 0 or 1, and the corresponding anhydride.

主权项

1. A method for producing a 3,4-dialkylbiphenyl-3′,4′-dicarboxylic acid compound represented by a general formula (2), the method comprising subjecting a 3,4-dicarboalkoxycyclohexyl-3′,4′-alkylbenzene compound represented by a general formula (4-1) to a dehydrogenation reaction in the presence of a metallic catalyst; wherein R1 and R2 each represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and R3 and R4 each represents an alkyl group having 1 to 4 carbon atoms; wherein R1, R2, R3, and R4 have the same definitions as those described above.