Maleic Anhydride → 2-Hydroxyethyl oxabicyclo[2,2,1]hept-5-ene-2-carboxylate t-butyl 5-norbornene-2-carboxylate 5-norbornene-2-carboxylic acid maleic anhydride

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Reaction Steps

2-hydroxyethyl oxabicyclo[2,2,1]hept-5-ene-2-carboxylate (0.1 mol), t-butyl 5-norbornene-2-carboxylate (0.85 mol), 5-norbornene-2-carboxylic acid (0.05 mol) and maleic anhydride (1 mol) were dissolved in tetrahydrofuran solvent (200 g). Thereto, 2,2-azobisisobutyonitrile (5.84 g) was added, and the solution was mixed. The solution was polymerized at a temperature of 67° C. in a nitrogen atmosphere for 10 hours. After the polymerization reaction was completed, the polymer was precipitated in an ethyl ether solvent, then was dried in a vacuum to obtain the pure title polymer (89.4 g) having a molecular weight of approximately 6700. (yield: 31%, purity: 99.9%).

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