Hydrochloric Acid → 2,2,5-Trimethylcyclopentanone

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Reaction Steps

A solution of the product of Example 8c in methanol and water (7.4 g, ˜35.7 mmol) was acidified with concentrated hydrochloric acid to pH=1 and then heated to reflux for 1 hour. The reaction mixture was cooled and then diluted with water (70 mL) and the organics were extracted with diethyl ether (80 mL×4). The combined organic phase was washed with brine (160 mL), dried over anhydrous sodium sulfate and concentrated under reduced pressure to give the title compound as a light yellow liquid contaminated with some solvent (4.93 g, Purity: ˜85%). 1H NMR (400 MHz, CDCl3) δ 2.26-2.09 (m, 2H), 1.85-1.79 (m, 1H), 1.72-1.64 (m, 1H), 1.54-1.45 (m, 1H), 1.12 (d, J=6.8 Hz, 3H), 1.08 (s, 3H), 0.98 (s, 3H) ppm.

Provenance & Evidence