How is Dimethyl 4-fluorophthalate (CAS: 110706-50-8) typically synthesized?

Dimethyl 4-fluorophthalate (CAS: 110706-50-8) is typically synthesized by the reaction of 4-fluorophthalic anhydride with dimethyl alcohol in the presence of a suitable catalyst such as sulfuric acid or p-toluenesulfonic acid. The reaction is carried out under reflux conditions, and the product is purified by recrystallization or distillation to obtain a high-purity product with a yield of around 85-90%.