A solution of p-toluenesulfonyl chloride (65.2 g., 0.342 mole) in pyridine (130 ml.) is cooled in a cold water (10°-15°) bath while 4-acetoxy-5-(3-trifluoromethylphenoxy)-1-pentanol (90.7 g., 0.297 mole) is added dropwise with stirring during 70 minutes. The mixture is then stirred 2 hours in the same cold water bath. It is poured into 400 ml. of water. The oily product is taken up in ether, washed with water, 2N hydrochloric acid and dilute sodium bicarbonate solution and dried over magnesium sulfate. The solvent is evaporated in vacuo to leave 125 g. (94%) of the crude title compound as a nearly colorless oil.
