224311-51-7

13716-10-4

2052-07-5

224311-51-7

Grignard reagent was prepared by adding 40 g of 2-bromobiphenyl, 5 g of magnesium shavings and 400 ml of anhydrous THF to a 1 L three-necked flask under nitrogen protection and refluxed for 2 hours. After the reaction mixture was cooled to room temperature, 2 g of tetrakis (triphenylphosphine) palladium was added and stirred for 30 minutes. Subsequently, 33 g of di-tert-butylphosphonium chloride was slowly added dropwise at room temperature and the reaction mixture was refluxed for 2 hours after completion of the dropwise addition. Upon completion of the reaction, the mixture was quenched by slow dropwise addition to 200 mL of saturated aqueous ammonium chloride solution under cooling in an ice water bath. The organic phase was separated, dissolved and crystallized by adding methanol, and filtered to give 49 g of white solid 2-(di-tert-butylphosphino)biphenyl in 95.7% yield.