Sulfuric Acid → HCID 11510495, compound

Participants

Reaction Steps

In a 500 ml four-necked flask thoroughly purged with nitrogen, a Grignard reagent solution previously prepared from 20.5 g (0.12 mol) of 2-bromotoluene and 3.1 g (0.13 mol) of metallic magnesium in a mixed solvent of 100 ml of tetrahydrofuran and 40 ml of toluene, and 0.05 g (0.0005 mol (corresponding to 0.5% by mol)) of copper(I) chloride were placed. To the contents of the flask, a solution of 18.1 g (0.10 mol) of di-tert-butylphosphinous chloride in 30 ml of tetrahydrofuran was dropwise added over a period of 1 hour with maintaining the temperature at 25° C. to 30° C. After the dropwise addition was completed, stirring was conducted at 50° C. for 4 hours. After the temperature of the reaction solution was returned to room temperature, disappearance of di-tert-butylphosphinous chloride was confirmed by gas chromatography. Thereafter, 30 ml of a 5% sulfuric acid aqueous solution was 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 112° C. to 114° C. under reduced pressure of 3 Torr were collected. As a result, 21.5 g (purity: 99.0%) of the aimed di-tert-butyl(2-methylphenyl)phosphine was obtained. The yield was 91.0%.

Provenance & Evidence