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Cyclopentadiene (66 g) and tetrahydrofuran solvent (500 g) are charged in a reactor and the mixture is stirred homogeneously. To the reaction mixture, maleic anhydride (98 g) is added, and the resultant mixture is stirred at 0° C. for about 12 hours. Then, the mixture is filtered to remove the precipitate. To the resultant reactant, a 10% aqueous NaOH solution is added to carry out a hydrolysis reaction. The reactant is neutralized by using a 10% sulfuric acid solution. When reaction is completed, the resultant product is recovered by filtration and dried to obtain 150 g (yield: 86%) of mono-methyl cis 5-norbornene-endo-2,3-dicarboxylate.

1. filtrationThen, the mixture is filtered
2. customto remove the precipitate
3. additionTo the resultant reactant, a 10% aqueous NaOH solution is added
4. customa hydrolysis reaction
5. customWhen reaction
6. filtrationthe resultant product is recovered by filtration
7. customdried