反应详情

A solution of 95 g (500 mmol) of 4-bromo-2-fluorotoluene in 200 ml of anhydrous ethyl ether is added dropwise to a suspension of 12.2 g (500 mmol) of magnesium turnings covered with anhydrous ethyl ether. When the addition has ended, the mixture is stirred for 30 minutes at room temperature and a solution of 50 g of 4-(benzylthio)benzonitrile in 200 ml of anhydrous tetrahydrofuran is then added dropwise. The ethyl ether is distilled and the mixture is refluxed for 6 hours. After cooling, the mixture is run dropwise into 600 ml of 6N hydrochloric acid solution and the resulting solution is refluxed for 6 hours. After the addition of isopropyl ether, the crystals formed are filtered off and washed with ethanol and then with ethyl ether to give 55.4 g of 3-fluoro-4-methyl-4'-benzylthiobenzophenone in the form of crystals melting at 122° C.

1. additionWhen the addition
2. distillationThe ethyl ether is distilled
3. temperaturethe mixture is refluxed for 6 hours
4. temperatureAfter cooling
5. temperaturethe resulting solution is refluxed for 6 hours
6. additionAfter the addition of isopropyl ether
7. customthe crystals formed
8. filtrationare filtered off
9. washwashed with ethanol