Iodine → Bis-(2,4-dimethylphenyl)chlorophosphine

A solution of 2.92 ml (2161 mmol) of 4-bromo-1,3-dimethylbenzene in 3 ml of Et2O were added at 0° C. to a suspension of 0.5 g (20.56 mmol) of magnesium turnings in 7 ml of THF and 7 ml of Et2O and also a crystal of iodine. The mixture was heated to room temperature, stirred further overnight and slowly added dropwise at 0° C. to a solution of 1.5 ml (10.31 mmol) of Et2NPCl2 in 8 ml of THF. The mixture was heated to room temperature and the solvent was subsequently removed under reduced pressure. After adding 60 ml of hexane, the mixture was filtered through Celite under argon and admixed with hydrogen chloride for 1 hour. After degassing, the resulting solids were filtered off under argon and dried. Yield: 1.4 g (58.3% of theory). 1H NMR (400 MHz, CDCl3) δ, 7.40 (d, Jmeta=4.5 Hz, 2H, arom.), 7.2 (m, 4H, arom.), 2.5 (d, JPH=2.0 Hz, 6H, CH3), 2.4 (s, 6H, CH3). 31P NMR (161.974 MHz, CDCl3) δ, 75.6.

1. temperatureThe mixture was heated to room temperature
2. customthe solvent was subsequently removed under reduced pressure
3. additionAfter adding 60 ml of hexane
4. filtrationthe mixture was filtered through Celite under argon
5. waitadmixed with hydrogen chloride for 1 hour
6. customAfter degassing
7. filtrationthe resulting solids were filtered off under argon
8. customdried

ORD record

ord-fcafcc4f67fc42058b0d154e0197b24c

Source dataset

uspto-grants-2007_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07193092B2