Carbon Dioxide → 1,3-Cyclopentanedicarboxylic acid

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A 22-L, 3-neck, round bottom flask was equipped with a mechanical stirrer, a J-KEM temperature controller, and a nitrogen inlet. The flask was charged with norbornene (200 g, 2.123 mol), ethyl acetate (1.95 L), and acetonitrile (1.95 L). The reaction mixture was cooled to 5° C. using an acetone/dry ice bath. Ruthenium trichloride (9.69 g, 46.72 mmol) was added in one portion followed by the slow addition of a suspension of sodium periodate (1.816 kg, 8.707 mol) in water (2.925 L) over 30 min. The reaction slowly began to exotherm and was monitored to keep the temperature between 10° C. and 15° C. After 90 min the reaction mixture suddenly thickened to the point where stirring was difficult and exothermed rapidly up to 39° C. (a large amount of dry ice was added to the cooling bath to control the exotherm). The reaction mixture was allowed to cool to 20° C., the dry ice/acetone bath was removed, and the mixture was stirred at room temperature overnight. The solids were removed by filtration through a pad of celite and the filtrate was concentrated to a solid which was triturated with hexane (2 L), filtered, and rinsed with hexane (2×500 mL) to yield 195 g (58%) of cyclopentane-1,3-dicarboxylic acid. 1H NMR (500 Hz, DMSO-d6) δ ppm 12.07 (s, 2H), 2.66-2.73 (m, 2H), 2.06-2.12 (m, 1H), 1.85-1.89 (m, 1H), 1.72-1.85 (m, 4H).

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