反应详情

A mixture of 5.0 g of 3-(2,6-di-tertiary-butylcyclohexadienon-4-ylideneamino )-4-hydroxybenzoic acid, 0.05 g of 5% palaldium on charcoal catalyst, 250 ml of ethanol and 50 ml of tetrahydrofuran was placed on a Paar apparatus. Hydrogen uptake was complete in about 10 minutes. The reaction mixture was filtered to remove catalyst. The filtrate was evaporated to give a tan solid which was recrystallized from a mixture of 40 ml of ethanol and 15 ml of water to give 3.2 g of reddish tan granular 3-(3,5-di-tertiary-butyl-4-hydroxyanilino)-4-hydroxybenzoic acid, m.p. 254.5°-255° C. (dec). Analysis: Calculated for C21H27NO4 : % C, 70.6; % H, 7.6; % N, 3.9; Found: % C, 71.0; % H, 7.6; % N, 4.1.

1. filtrationThe reaction mixture was filtered
2. customto remove catalyst
3. customThe filtrate was evaporated
4. customto give a tan solid which
5. customwas recrystallized from a mixture of 40 ml of ethanol and 15 ml of water