反应详情

23.7 g. (0.147 mole) 1,4-Dihydroxynaphthalene (purified by shaking an ethereal solution thereof with sodium dithionite solution) are dissolved in 200 ml. acetone. After adding 20.3 g. (0.147 mole) of pulverised potassium hydroxide and heating to reflux temperature, 18.6 g. (16.9 ml.) benzyl chloride are added dropwise thereto in the course of 60 minutes. The reaction mixture is thereafter heated under reflux for 4 hours while stirring, evaporated and the residue is mixed with 100 ml. water and extracted with diethyl ether. The ethereal solution is dried with anhydrous magnesium sulphate, filtered and evaporated. The tar-like residue is extracted with cyclohexane. The combined extracts are cooled, considerable amounts of a tarry product thereby first separating out. Thereafter, the pure compound crystallises out. It is washed with cyclohexane and dried. Yield 4.3 g. (11.9% of theory); m.p. 118°-119° C.

1. additionAfter adding 20.3 g
2. temperatureto reflux temperature, 18.6 g
3. customin the course of 60 minutes
4. temperatureThe reaction mixture is thereafter heated
5. temperatureunder reflux for 4 hours
6. stirringwhile stirring
7. customevaporated
8. additionthe residue is mixed with 100 ml
9. extractionwater and extracted with diethyl ether
10. dry with materialThe ethereal solution is dried with anhydrous magnesium sulphate
11. filtrationfiltered
12. customevaporated
13. extractionThe tar-like residue is extracted with cyclohexane
14. temperatureThe combined extracts are cooled
15. customconsiderable amounts of a tarry product thereby first separating out
16. customThereafter, the pure compound crystallises out
17. washIt is washed with cyclohexane
18. customdried