反应详情

26 g (0.1 mole) of 2-[(para-bromo)-phenoxy]-2-methyl-propionic acid is dissolved in 200 cc of anhydrous THF and placed in a 500 cc flask. The mixture is cooled in an ice bath and 0.2 mole of methylmagnesium iodide (prepared in solution of THF) is added slowly. After this addition, the temperature is allowed to rise and the mixture stirred at ambient temperature for 11/2 hours. Then slowly and drop by drop a solution of 4.1 g (0.1 mole) of benzonitrile in 20 cc of THF is added and the mixture is stirred for 2 hours 30 minutes at ambient temperature. The reaction mixture is poured on to 500 cc of 10% hydrochloric acid, cooled by 500 g of ice, and vigorously stirred. The reaction mixture is extracted with ether and the ethereal phases are washed, dried and decolorised. The ether solvent is evaporated under vacuum and the oily residue placed in a desiccator under vacuum. 2-[(para-benzoyl)-phenoxy]-2-methylpropionic acid slowly crystallises (22 g). The yield is 77% and the melting point 130° C.

1. customplaced in a 500 cc flask
2. temperatureThe mixture is cooled in an ice bath
3. additionAfter this addition
4. additionis added
5. stirringthe mixture is stirred for 2 hours 30 minutes at ambient temperature
6. stirringvigorously stirred
7. extractionThe reaction mixture is extracted with ether
8. washthe ethereal phases are washed
9. customdried
10. customThe ether solvent is evaporated under vacuum
11. customthe oily residue placed in a desiccator under vacuum
12. custom2-[(para-benzoyl)-phenoxy]-2-methylpropionic acid slowly crystallises (22 g)