Hydrogen Peroxide → HCID 86690455, compound

Participants

Reaction Steps

1-Bromo-3,5-dimethoxybenzene (10 g, 46.1 mmol) in THF (60 ml) was added to a flask (250 ml) with magnesium (1.2 g, 49.9 mmol) and I2 (20 mg) in THF (40 ml) at 60° C. The mixture was refluxed for 2 h after the addition was completed. It was cooled to RT. The resulting light brown solution was transferred to another flask (250 ml). It was cooled to −78° C. and chlorobis(4-methoxy-3,5-dimethylphenyl)phosphine (16.8 g, 49.9 mmol) in THF (40 ml) was added dropwise at −78° C. within 1 h. The resulting mixture was stirred at −78° C. for 0.5 h, then slowly warmed up to RT and stirred at RT for 30 min. To the resulting mixture water (50 ml) was added, then H2O2 (13 ml) was added dropwise at 0° C. The mixture was stirred for 0.5 h at RT. The organic layer was separated and the aqueous layer was extracted with ethyl acetate (100 ml×2) and CH2Cl2 (100 ml×1). The combined organic layer was washed with brine (200 ml×2), NaHSO3 (200 ml×3) and dried over MgSO4. It was filtered and the solvent was removed. The viscous residues were stirred with CH2Cl2/hexane (5 ml/100 ml) for 1 h. The solid was collected by filtration to give the product as a colorless solid (17.4 g, 83 yield). 1H NMR (300 MHz, CD2Cl2) δ: 7.32 (s, 2H), 7.28 (s, 2H), 6.76 (dd, J=2.4 Hz, J=12.9 Hz, 2H), 6.61 (t, J=2.4 Hz, 1H), 3.78 (s, 6H), 3.75 (s, 6H), 2.28 (s, 12H). 31P NMR (121.5 MHz, CD2Cl2) δ: 28.4.

Provenance & Evidence