Phosphorus pentabromide → Ethyl alpha-bromo-2'-chloro-4-biphenylylacetate

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Reaction Steps

To 15.0 g. (0.0476 moles) of ethyl 2'-chloro-4-biphenylylglycolate there is added slowly with stirring at 40°-50°C 23 g. (0.053 moles) of phosphorus pentabromide. The mixture is stirred at room temperature for 16 hours, then diluted with 70 ml. of petroleum ether, and poured into 125 ml. of ice-cold water. The organic phase is separated, washed with saturated aqueous sodium hydrogen carbonate solution, dried over anhydrous sodium sulfate, filtered and the solvent removed in vacuo to obtain ethyl α-bromo-2'-chloro-4-biphenylylacetate.

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