Catalytic synthesis of methyl 1-naphthyl acetate with aminosulfonic acid

The optimum conditions have been studied on which the 1-naphthaleneacetic acid and methanol are esterified into methyl 1-naphthyl acetate in the presence of the aminosulfonic acid, and the reuseability of the catalyst. The yield of the ester could reach 97.5% when the mole ratio of 1-naphthaleneacetic acid, methanol and aminosulfonic acid was 1∶10∶1.05, and the mixture was refluxing for 5 h.