Dimethylformamide → 4-Bromo-2,2-diphenylbutyric chloride

Beteiligte Stoffe

Reaktionsschritte

In 5 mL of chloroform was suspended 5.00 g (15.7 mmol) of 4-bromo-2,2-diphenylbutyric acid. Thionyl chloride (10 mL) was then added dropwise at room temperature. To the resulting mixture was added 0.1 mL of dimethylformamide, followed by heating under reflux for 5 hours. After completion of the reaction, the solvent was concentrated under reduced pressure, whereby 4-bromo-2,2-diphenylbutyric chloride was obtained. While stirring under ice cooling, 50 mL of cold methanol was added. The temperature was allowed to rise back to room temperature, and then stirring was conducted for 30 minutes. The residue obtained by concentrating the solvent under reduced pressure was purified by chromatography on a silica gel column, whereby 5.00 g (yield: 95.7%) of methyl 4-bromo-2,2-diphenylbutyrate was obtained.

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