反应详情

To a stirred solution of 28.3 ml. (0.2 mole) 2,4-dimethyl-3-pentanone in 100 ml. chloroform was added dropwise 10.3 ml. (0.2 mole) bromine in 30 ml. of the same solvent. The resulting mixture was stirred for a few minutes, the solvent evaporated in vacuo, the residue taken up in 100 ml. ethanol. Water, 50 ml., and 10 M sodium hydroxide, 50 ml., added. The resulting mixture was stirred at reflux for one hour, diluted with 200 ml. water and extracted with 3×50 ml. ethyl ether. The extracts were dried (MgSO4) evaporated to dryness and the residue distilled to obtain 15.95 g. (61%) of the hydroxy-ketone, b.p. 60°-62° C./18 mm.

1. customthe solvent evaporated in vacuo
2. addition, added
3. stirringThe resulting mixture was stirred
4. temperatureat reflux for one hour
5. additiondiluted with 200 ml
6. extractionwater and extracted with 3×50 ml
7. dry with materialThe extracts were dried (MgSO4)
8. customevaporated to dryness
9. distillationthe residue distilled
10. customto obtain 15.95 g