Sodium Bicarbonate → 1,1-Bis(propan-2-yl) 3-oxocyclobutane-1,1-dicarboxylate

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A solution of dipropan-2-yl 3,3-dimethoxycyclobutane-1,1-dicarboxylate (10.0 g, 34.6 mmol) in hydrochloric acid (3 N, 55 mL) was heated at 50° C. for 4 hours. The resulting mixture was neutralized with a saturated aqueous solution of sodium bicarbonate and extracted with ethyl acetate (100 mL). The combined organic layers were dried over sodium sulfate and concentrated in vacuo to afford 6.073 g of dipropan-2-yl 3-oxocyclobutane-1,1-dicarboxylate as a light brown oil (yield was 72.3%).

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