反应详情

In pyridine was dissolved 5 g of dodecyl p-hydroxybenzoate, and a solution of 5 g of p-acetoxybenzoic acid chloride in chloroform was added dropwise to the solution and the mixture was stirred at room temperature for 4 hours. Water was added to the thus-obtained solution, the mixture was extracted with chloroform, and the extract was washed with a 0.5N aqueous solution of hydrochloric acid, a saturated aqueous solution of sodium chloride, a saturated aqueous solution of NaHCO3 and a saturated aqueous solution of sodium chloride in succession, dehydrated on anhydrous magnesium sulfate and concentrated. The concentrate was recrystallized from a mixed solvent of n-hexane and ethyl acetate to obtain 3.18 g dodecyl 4-(4-acetoxybenzoyloxy)benzoate. The obtained ester was dissolved in a mixed solvent of tetrahydrofuran and methanol at a volume ratio of 10/1, 7 ml of a 1N aqueous solution of lithium hydroxide was added to the solution, and the obtained mixture was stirred at room temperature for 1 hour, diluted with ethyl acetate and washed with a saturated aqueous solution of sodium chloride. Then, the liquid was dried on anhydrous magnesium sulfate and concentrated, and the concentrate was recrystallized from a liquid mixture of n-hexane and ethyl acetate to obtain 2.22 g of dodecyl 4-(4-hydroxybenzoyloxy)benzoate.

1. extractionthe mixture was extracted with chloroform
2. washthe extract was washed with a 0.5N aqueous solution of hydrochloric acid
3. concentrationconcentrated
4. customThe concentrate was recrystallized from a mixed solvent of n-hexane and ethyl acetate