Method for synthesizing dibornyl oxalate by using borneol

The invention discloses a method for synthesizing dibornyl oxalate by using borneol. The method comprises the following steps: dissolving borneol into a certain amount of organic solvent; reacting with anhydrous oxalic acid at a certain temperature for certain time in the presence of the catalysts such as boric oxide, pyroboric acid or metaboric acid or titanium sulfate and metatitanic acid; filtering to remove the catalysts and unreacted anhydrous oxalic acid; washing with water many times; distilling the upper-layer liquid to remove the organic solvent to obtain a crude product; and performing water vapor distillation, recrystallization and the like to remove the unreacted raw material borneol, thus obtaining dibornyl oxalate. The raw material borneol comprises d-borneol, l-borneol and dl-borneol. In the reaction, the organic solvents such as aromatic hydrocarbon and branched paraffin can be used as reaction media. With a conventional heating process, the method disclosed by the invention has the advantages of mild conditions, simplicity in operation, easy separation of raw material from product, few side reactions and high product yield.