Hydrochloric Acid → 2-((4-(Dimethylamino)-3,5-bis(1-methylethyl)phenyl)thio)-hexanoic acid

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To the toluene solution containing the mercaptophenol prepared above 200 ml. of 20% sodium hydroxide and 7.4 grams of 2-bromo-hexanoic acid were added. The reaction mass was stirred at room temperature for about one hour. The mixture was then treated with 100 ml. of 1 N hydrochloric acid. The resulting layers were separated and the toluene was washed twice or until neutral. The organic layers were dried over Na2SO4 and evaporated to leave a light yellow oil weighing 13.4 grams which crystallized on standing. The crystals of 2-((4-(di-methylamino)-3,5-bis(1-methylethyl)phenyl)thio)-hexanoic acid were washed with cold pentane and sucked dry on a suction filter to give 3.14 grams of product. The melting point was found to be 66°-68° C. Infrared and NMR analysis confirmed the structure.

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