反应详情

To a solution of 2.97 g (0.01 mole) of 4'-amino-3,5-di-t-butyl-4-hydroxy biphenyl in 200 ml of diethyl ester was added a solution of 1.48 g (0.01 mole) of phthalic anhydride, and the resulting solution was stirred for about 16 hours. The solvents were removed under vacuum and the residual solid was recrystallized from a mixture of ethyl acetate and hexane to give 2.4 g of 2-{N-[4-(3,5-di-t-butyl-4-hydroxyphenyl)phenyl]carbamoyl}benzoic acid, m.p. 196°-198° C. Analysis: Calculated for C28H31NO4 : % C, 75.5; % H, 7.0; % N, 3.1; Found: % C, 75.5; % H, 7.1; % N, 3.0.

1. customThe solvents were removed under vacuum
2. customthe residual solid was recrystallized from a mixture of ethyl acetate and hexane