Hydrochloric Acid → HCID 14678242, compound

Participants

Reaction Steps

15.1 Grams of methyl acetoacetate were dissolved in 20 ml of water, and 19.4 g of a 28% aqueous sodium hydroxide solution were added thereto by drops while cooling the mixture to 35° C. or less. After having been stirred at 30°-35° C. for 2 hours, the mixture was adjusted to pH 7.5 with a concentrated aqueous hydrochloric acid solution. Thereafter, 0.82 g of sodium acetate and 3.22 g of tetrabutylammonium bromide were added thereto and then 60.3 g of a toluene solution containing 36.9% of 3-(2-trifluoromethylphenylthio)propanal were added thereto. The mixture was stirred at 45°-50° C. for 6 hours. After the mixture had been neutralized with a concentrated aqueous hydrochloric acid solution, the organic layer was separated, washed with a saturated aqueous sodium chloride solution and then dried over anhydrous magnesium sulfate. Removing the solvent from the layer under reduced pressure gave 31.10 g of crude 4-hydroxy-6-(2-trifluoromethylphenylthio)-2-hexanone (purity: 83.7%, yield: 93.7%).

Provenance & Evidence