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

摘要

The present invention relates to the 3,4-Dicarboalkoxybiphenyl-3′,4′-dicarboxylic acid (including the corresponding acid anhydride) represented by the general formula (1):;
wherein 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.

主权项

1. A method for producing a 3,4-dicarboalkoxybiphenyl-3′,4′-dicarboxylic acid (including the corresponding acid anhydride) represented by a general formula (1-1), wherein
the method comprises oxidizing a 3,4-dialkylbiphenyl-3′,4′-dicarboxylic acid compound represented by a general formula (2) or a 3,4-dimethylbiphenyldicarboxylic acid compound represented by a general formula (3) (hereinafter referred to as an oxidation):wherein in general formula (1-1), R1 and R2 each represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and n represents the number of waters of hydration that is 0 or 1,in general formula 2 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, andin general formula (3), R1 and R2 each represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.