反应详情

To a Grignard reagent prepared from magnesium (26.7 g), 2,5-dichlorothiophene (16.83 g) and anhydrous THF (70 ml) was added dropwise in small portions a solution of cyclohexanone (XIa) (9.815 g) in anhydrous THF (30 ml) with stirring under ice-cooling in nitrogen atmosphere. The mixture was made to react at room temperature for 3 hours and after addition of water and acidification with 5% hydrochloric acid, extracted with chloroform. The extract was washed with water, dried and evaporated. The residue was applied to column chromatography on silica gel (70 g). From the benzene fraction, 1-(5-chloro-2-thienyl)cyclohexanol (Xa) (17.6 g) was obtained as an oil (yield 81.2%).

1. temperaturecooling in nitrogen atmosphere
2. customto react at room temperature for 3 hours
3. extractionextracted with chloroform
4. washThe extract was washed with water
5. customdried
6. customevaporated