1,2,4-Butanetriol → 2,2-Diarachidonyl-4-(2-hydroxyethyl)-[1,3]-dioxolane

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A mixture of diarachidonyl ketone (V, 0.30 g, 0.52 mmol), 1,2,4-butanetriol (0.25 g, 2.4 mmol) and pyridinium p-toluenesulfonate (20 mg) in 60 mL of toluene was refluxed under argon overnight with a Dean-Stark tube to remove water. The resulting mixture was cooled to room temperature. The organic phase was washed with water (2×30 mL), brine (30 mL), and dried over anhydrous Na2SO4. Evaporation of the solvent resulted in a yellowish oily residual. The crude product was purified by column chromatography on silica gel (230-400 mesh, 40 mL) with 0-2% methanol in dichloromethane as eluent. This afforded 0.29 g (84%) of pure VI as pale oil.

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