Sulfuric Acid → Di-tert-butyl(isopropyl)phosphine

Participants

Reaction Steps

In a 300 ml four-necked flask thoroughly purged with nitrogen, 9.0 g (0.05 mol) of di-tert-butylphosphinous chloride, 0.05 g (0.001 mol (corresponding to 1% by mol)) of copper(I) chloride and 30 ml of tetrahydrofuran were placed. To the contents of the flask, a Grignard reagent solution previously prepared from 4.7 g (0.060 mol) of isopropyl chloride and 1.7 g (0.072 mol) of metallic magnesium in 50 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 the same temperature for 3 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, 20 ml of toluene and 30 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 and a low-boiling component were distilled off under reduced pressure to obtain 8.2 g (purity: 95.0%) of the aimed di-tert-butylisopropylphosphine as an oily substance. The yield was 92.7%.

Provenance & Evidence