反应详情

A mixture of 231 g of 2-bromo-5-methoxybenzoic acid, 262 g of 4-benzyloxyaniline hydrochloride, 160 g of potassium carbonate and 2 g of activated copper powder in about 2100 ml of amyl alcohol was heated at reflux with stirring for 4.5 hours. The reaction mixture was concentrated in vacuo and the residue dissolved in 6 liters of water. The solution was filtered and acidified with hydrochloric acid. The solid which formed was collected and recrystallized twice from benzene-cyclohexane to give 245 g of 2-(4-benzyloxyphenylamino)-5-methoxybenzoic acid, m.p. 167°-168° C.

1. temperaturewas heated
2. temperatureat reflux
3. concentrationThe reaction mixture was concentrated in vacuo
4. dissolutionthe residue dissolved in 6 liters of water
5. filtrationThe solution was filtered
6. customThe solid which formed
7. customwas collected
8. customrecrystallized twice from benzene-cyclohexane