3,4-dialkylbiphenyldicarboxylic acid compound, 3,4-dicarboalkoxybiphenyl-3′,4′-dicarboxylic acid and corresponding acid anhydrides, and processes for producing these compounds
View Patent ↗3,4-Dicarboalkoxybiphenyl-3′,4′-dicarboxylic acid represented by the general formula (1): in which R 11 and R 12 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.
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 R 1 and R 2 each represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and R 3 and R 4 each represents an alkyl group having 1 to 4 carbon atoms;
wherein R 1 , R 2 , R 3 , and R 4 have the same definitions as those described above.
2. The method for producing a 3,4-dialkylbiphenyl-3′,4′-dicarboxylic acid compound according to claim 1 , wherein the 3,4-dialkylbiphenyl-3′,4′-dicarboxylic acid compound is represented by a general formula (3):
wherein R 1 and R 2 each represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and
the 3,4-dicarboalkoxycyclohexyl-3′,4′-alkylbenzene compound is represented by a general formula (4-2):
wherein R 1 and R 2 have the same definitions as those described above.