Cyclobutanecarboxylic acid, 3-[2-(1,1-dimethylethoxy)-2-oxoethylidene]- → HCID 178451083, compound

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A mixture of 2 g of 3-tert-butoxycarbonylmethylene-cyclobutanecarboxylic acid, 150 mL of ethanol, 0.5 g of 5% platinum on carbon, and 200 mL of ethanol was stirred under 1 atm of hydrogen for 48 h overnight, filtered, diluted with 20 mL of toluene and concentrated under reduced pressure. Drying under vacuum overnight gave 2 g of product, which was predominantly as a colorless oil: 1H NMR (400 MHz, CDCl3) 10.2 (br s, 1H), 3.0 (m, 1H), 2.3 (m, 1H), 2.38 (m, 4H), 2.0 (dd, 2H), 1.4 (s, 9).

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