反应详情

14.8 g of kalium-tert-butoxide and 50 ml of tetrahydrofuran were put in a reaction reservoir having a mixer, a thermometer and a dropping funnel. Under a nitrogen stream, a solution wherein 9.90 g of the diethyl 2-hydroxybenzylphosphonate and 5.44 g of 4-(di-para-tolylamino) benzaldehyde were dissolved in tetrahydrofuran was slowly dropped there in at a room temperature, and the reaction therein is further performed for 2 hrs at the same temperature. Then, water was added therein while cooling the reaction product with water, a hydrochloric acid solution having a normal concentration of 2 was added therein to acidize the reaction product, and the tetrahydrofuran was removed by an evaporator to extract a crude product with toluene. The toluene phase was washed with water, a sodium hydrogen carbonate solution and a saturated saline in this order, and magnesium sulfate was further added thereto to dehydrate the toluene phase. After filtered, the toluene was removed therefrom to prepare an oily crude product, and the oily crude product was further column-refined with silica gel to crystallize 5.09 g of 2-hydroxy-4′-(di-para-tolylamino) stilbene in hexane at a yield of 72%, having a boiling point of 136.0 to 138.0° C.

1. additionwas slowly dropped there in at a room temperature
2. customthe reaction
3. concentrationa normal concentration of 2
4. additionwas added
5. customthe tetrahydrofuran was removed by an evaporator
6. extractionto extract a crude product with toluene
7. washThe toluene phase was washed with water
8. additiona sodium hydrogen carbonate solution and a saturated saline in this order, and magnesium sulfate was further added
9. filtrationAfter filtered
10. customthe toluene was removed
11. customto prepare an oily crude product
12. customto crystallize 5.09 g of 2-hydroxy-4′-(di-para-tolylamino) stilbene in hexane at a yield of 72%