Hydrochloric Acid → 2'-Hydroxy-2-[bis-(3-fluorophenyl)phosphino]biphenyl

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16.4 g (70 mmol) of 6-chloro-6H-dibenz[c,e][1,2]oxaphosphorine in 80 ml of anhydrous tetrahydrofuran are introduced, in an argon atmosphere with stirring, and a 2M solution of 140 mmol of 3-fluorophenylmagnesium bromide in tetrahydrofuran is added dropwise. The temperature increases in the course of this from 25° to 45° C. The mixture is then stirred for 12 hours at 65° C., cooled to room temperature and 100 ml of water and 100 ml of ethyl acetate are added. The mixture is neutralized with dilute hydrochloric acid, the organic phase is separated off, dried with sodium sulfate and concentrated under reduced pressure. 25.8 g of colorless oil are obtained. By crystallization with methanol/water, 10:1, 19.8 g (71%) of colorless crystals having melting point 161° to 163° C. are obtained.

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