Tetrahydrofuran → Diethenylphenylphosphine oxide

Temperature

-78 °C

A solution of phenylphosphonic dichloride (29 mL, 200 mmol) dissolved in anhydrous THF (600 mL) was cooled to −78° C. and mechanically stirred under an atmosphere of dry nitrogen. Vinylmagnesium bromide (1 M in THF, 500 mL) was slowly added so that the temperature of the reaction mixture never exceeded −70° C. The addition took 2 hours. After an additional 1 hour of stirring at −78° C., the cold reaction mixture was poured directly into cold, saturated NH4Cl (1 L). The mixture was extracted twice with CH2Cl2 and the combined organic phase was washed with 1 M NaOH, brine, and then dried over Mg2SO4. Filtration and solvent evaporation provided divinyl-phenyl-phosphine oxide (26.8 g, 75%) as a viscous yellow oil that solidified upon standing. 1H NMR (400 MHz, DMSO-d6); δ 7.8-7.4 (m, 5H), 6.7 (m, 2H), 6.4-6.1 (m, 4H). 31P NMR (DMSO-d6); δ 17.0 (s).

1. additionThe addition
2. stirringAfter an additional 1 hour of stirring at −78° C.
3. customthe cold reaction mixture
4. extractionThe mixture was extracted twice with CH2Cl2
5. washthe combined organic phase was washed with 1 M NaOH, brine
6. dry with materialdried over Mg2SO4
7. filtrationFiltration and solvent evaporation

ORD record

ord-3856480987e64374ba433607c49ad141

Source dataset

uspto-grants-2009_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07625880B2