Method for synthesizing 2-ethoxy-1-naphthoic acid

The invention discloses a method for synthesizing 2-ethoxy-1-naphthoic acid, which comprises the following steps of: dissolving 2-hydroxy-1-naphthaldehyde in absolute ethanol, performing reflux reaction in the presence of a catalyst of sodium bisulfate monohydrate, recycling partial ethanol, pouring the rest solution into purified water, and separating out 2-ethoxy-1-naphthaldehyde; and adding the 2-ethoxy-1-naphthaldehyde into acetone, heating for dissolution, adding hydrogen peroxide under the alkaline condition for reaction, recycling the acetone, and acidifying for separating out a white crystalline solid of 2-ethoxy-1-naphthoic acid. The production process is simple, the reaction byproducts are a few, the cost is saved, the environment is protected, the product quality is good, and the method is suitable for industrial production.