反应详情

温度

-10 °C

3.6 g (15 mmol) 4-(2-hydroxyethoxy)benzophenone and 1.8 g (18 mmol) triethyl amine were dissolved in 40 ml 2-butanone. The mixture was cooled to −10° C. and 2.3 g (18 mmol) 3-chloro-propionyl chloride was added drop wise while the temperature was kept below −5° C. The reaction was allowed to continue first at 0° C. for 30 minutes, followed by 16 hours at room temperature. The precipitated salts were removed by filtration and the solvent was removed under reduced pressure. The crude 3-chloro-propionic acid 2-(4-benzoylphenoxy)ethyl ester was purified by preparative column chromatography on a Prochrom LC80 column, using n.-hexane/ethyl acetate 70/30 as eluent at a flow rate of 50 ml/min and Kromasil 60A 10 micron as silica. 1.9 g (32%) of 3-chloro-propionic acid 2-(4-benzoylphenoxy)ethyl ester was isolated.

1. customwas kept below −5° C
2. waitfollowed by 16 hours at room temperature
3. customThe precipitated salts were removed by filtration
4. customthe solvent was removed under reduced pressure
5. customThe crude 3-chloro-propionic acid 2-(4-benzoylphenoxy)ethyl ester was purified by preparative column chromatography on a Prochrom LC80 column