[CH2:1](Cl)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[Mg].[C:10]([P:14](Cl)[C:15]([CH3:18])([CH3:17])[CH3:16])([CH3:13])([CH3:12])[CH3:11].S(=O)(=O)(O)O>O1CCCC1.[Cu](Br)Br.C1(C)C=CC=CC=1>[C:10]([P:14]([C:15]([CH3:18])([CH3:17])[CH3:16])[CH2:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1)([CH3:13])([CH3:12])[CH3:11]In a 200 ml four-necked flask thoroughly purged with nitrogen, a Grignard reagent solution previously prepared from 8.2 g (0.065 mol) of benzyl chloride and 2.1 g (0.085 mol) of metallic magnesium in 50 ml of tetrahydrofuran, and 0.055 g (0.0003 mol (corresponding to 0.6% by mol)) of copper(II) bromide were placed. To the contents of the flask, 9.0 g (0.05 mol) of di-tert-butylphosphinous chloride was dropwise added as it is without being dissolved in a solvent, over a period of 1 hour at a temperature in the vicinity of 40° C. After the dropwise addition was completed, stirring was conducted at a temperature of 40° C. to 45° C. for 3 hours. After the temperature of the reaction solution was returned to room temperature, 20 ml of toluene and 20 ml of a 5% sulfuric acid aqueous solution were added to the reaction solution to perform liquid separation. Then, the organic layer was washed with water and dried over anhydrous sodium sulfate. The solvent was distilled off under reduced pressure, followed by further distillation. Then, fractions given by distillation at 145° C. to 150° C. under reduced pressure of 0.5 Torr were collected. As a result, 10.6 g (purity: 98.5%) of the aimed di-tert-butylbenzylphosphine was obtained as an oily substance. The yield was 88.3%.
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