Triethylamine → N,N-Dimethyl-2-aminoethyl 3-(3,5-Di-tertiary-butyl-4-hydroxyanilino)benzoate

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Under a nitrogen atmosphere, 6.0 g (0.0176 mole) of 3-(3,5-di-tertiary-butyl-4-hydroxyanilino)benzoic acid (from Example 13) and 2.53 g (0.0176 mole) of 2-dimethylaminoethyl chloride hydrochloride were dissolved in 17 ml of N,N-dimethylformamide. To this mixture was added 4.9 ml (0.035 mole) of triethylamine and the reaction was heated at 100° C. for 25 hours. The reaction temperature was then raised to 120° C. and heating was continued for an additional 28 hours. The reaction mixture was diluted with 10 ml of diethyl ether, then filtered to remove triethylamine hydrochloride. The filtrate was diluted with additional diethyl ether and then shaken with cold 10% hydrochloric acid. A middle layer contained most of the product hydrochloride. It was diluted with water and ether, and basified with solid sodium carbonate. The ether extract was washed with saturated aqueous sodium chloride and then concentrated to give 1.7 g of a tan solid, m.p. 119°-120° C. This material was recrystallized first from 20 ml of cyclohexane and then from a mixture of 10 ml of ethanol and 3 ml of water to give 1.48 g of light yellow prisms of N,N-dimethyl-2-aminoethyl 3-(3,5-di-t-butyl-4-hydroxyanilino)benzoate m.p. 123°-124° C. Analysis: Calculated for C25H36N2O3 : % C, 72.8; % H, 8.8; % N, 6.8. Found: % C, 73.0; % H, 8.8; % N, 6.7.

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