| 摘要 |
PURPOSE:To obtain the titled compound in high yield, by hydrolyzing biphenyltetracarboxylic acid tetraalkyl ester is simple water in the presence of a catalyst comprising a specific amount of p-toluenesulfonic acid, thereby enabling the uniform reaction even under atmospheric pressure. CONSTITUTION:A biphenyltetracarboxylic acid tetra(1-3C alkyl) ester (abbreviated as BPTE), preferably biphenyltetracarboxylic acid tetramethyl ester, etc. obtained by the dehydrogenative dimerization of dimethyl o-phthalate in the presence of O2 and a Pd-containing catalyst, is made to react with >=3mol, preferably 4-10mol of p-toluenesulfonic acid (based on 1mol of BPTE) in water under atmospheric pressure at 80-110 deg.C, preferably near the boiling point of the reaction mixture, for 0.5-20hr, and hydrolyzed while distilling the produced methanol out of the system to obtain the objective compound. The amount of water used as the solvent is preferably 2-10pts.wt. per 1pt. of BPTE. |
