A process for producing a substituted phthalic acid which comprises heating a substituted tetrahydrophthalic acid compound having a substituent in at least one of the 3-, 4-, 5- and 6-positions in the presence of sulfur to dehydrogenate it, and heat-treating the product in the presence of water optionally together with an organic solvent. As required, the heat-treated product is dehydrocyclized to form a substituted phthalic acid anhydride.
一种生产取代
邻苯二甲酸的工艺,包括在有
硫存在的情况下加热在 3、4、5 和 6 位中至少一个位置上有取代基的取代四氢
邻苯二甲酸化合物,使其脱氢,然后在有
水存在的情况下(可选择与有机溶剂一起)对产物进行热处理。根据需要,将热处理产物脱氢环化,形成取代
邻苯二甲酸酐。