[Br-].[Li+].Cl[P:4](Cl)[C:5]1[CH:10]=[CH:9][CH:8]=[CH:7][CH:6]=1.[C:12]([Mg]Cl)([CH3:15])([CH3:14])[CH3:13].[H+].[B-:19]([F:23])([F:22])([F:21])[F:20]>CCOCC.CCCCCC>[F:20][B-:19]([F:23])([F:22])[F:21].[C:12]([PH+:4]([C:12]([CH3:15])([CH3:14])[CH3:13])[C:5]1[CH:10]=[CH:9][CH:8]=[CH:7][CH:6]=1)([CH3:15])([CH3:14])[CH3:13]In a round-bottomed flask, 60.6 mg of copper(I) bromide-dimethyl sulphide complex and 51.2 mg of lithium bromide are initially charged under protective gas. 20 ml of hexane, 4 ml of dichlorophenylphosphine and another 19 ml of hexane are subsequently added. The reaction solution is cooled to 0° C. 32.4 ml of a 2 M solution of tert-butylmagnesium chloride in ether are then slowly added dropwise. The mixture is subsequently allowed to slowly adjust to room temperature and is then stirred at room temperature for a further two hours. For workup, the mixture is cautiously admixed with 75 ml of degassed 2 M HBF4. Another 5 ml of 8 M HBF4 are then additionally added and stirred for 15 min. Filtration with suction is then effected and the filter cake is washed with a little cold water. The residue is dried under reduced pressure to constant weight. Yield: 7.9 g (86% of theory) purity >99%.
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