Potassium Hydroxide → 7-Hydroxymethyl-2,2,12,12-tetramethyltridecanedioic acid

Participants

Reaction Steps

To a homogeneous solution of potassium hydroxide (1.18 g, 21 mmol) in water (1.12 mL) and ethanol (3.8 mL) was added 7-hydroxymethyl-2,2,12,12-tetramethyltridecanedioic acid diethyl ester (2.9 g, 7.5 mmol) and the reaction mixture was heated at reflux for 4 h. The mixture was concentrated in vacuo, cooled to room temperature, and the residue was extracted with diethyl ether (2×50 mL). The pH of the aqueous layer was adjusted to 1 by addition of hydrochloric acid. The product was extracted with diethyl ether (3×50 mL). The combined organic layers were dried over sodium sulfate and concentrated in vacuo to afford the crude product which was purified by column chromatography on silica (hexanes:ethyl acetate=60:40) to yield 7-hydroxymethyl-2,2,12,12-tetramethyltridecanedioic acid (2.0 g, 81%) as an oil. 1H NMR (300 MHz, CDCl3/TMS): δ (ppm): 7.64 (br., 3H), 3.50 (d, 2H, J=4.4 Hz), 1.60-1.20 (m, 17H), 1.16 (s, 12H). 13C NMR (75 MHz, CDCl3/TMS): δ (ppm): 184.3, 65.2, 42.1, 40.5, 40.1, 30.6, 27.1, 25.2, 25.0. HRMS (LSIMS, nba): Calcd. for C18H35O5 (MH+): 331.2484. found 331.2484.

Provenance & Evidence