Phenylphosphine → Diphenyl[3-(phenylphosphanyl)propyl]phosphane

In a Schlenk flask were placed phenylphosphine (3.3806 g, 30.71 mmol) with THF (60 ml) and chilled to −30° C. in a freezer over 30 minutes. To this solution was added lithium diisopropylamide (16 ml, 32.16 mmol) and the resulting solution was allowed to warm to room temperature while stirring. In a 250 ml Schlenk flask was placed (C6H5)2P(CH2)3Cl (7.9089 g, 30.1 mmol) in 100 ml THF and the solution was cooled to −78° C. The lithium phenylphosphide solution was added to the (C6H5)2P(CH2)3Cl solution at such a rate that the temperature of the solution remained constant at −78° C. After addition, the solution was slowly warmed to room temperature. Degassed DI water (0.2 ml) was added to the dark orange solution. The color changed to yellow-orange. The solvents were removed in vacuo. The resulting gel was dissolved in toluene and filtered through Celite. Toluene was then removed in vacuo, leaving an orange-yellow oil. Yield: 10.0 g (99.1%). 31P{1H} NMR (CDCl3, 122 MHz, δppm: −16.30 and −52.86 (>99% pure). 1H NMR (CDCl3, 400 MHz, δ: 1.58–2.15 (3 complex peaks integrated to ˜7Hs), 4.12 (d of t, H—P) and 7.26–7.43 (complex pattern).

1. customIn a Schlenk flask were placed
2. customIn a 250 ml Schlenk flask was placed
3. customremained constant at −78° C
4. additionAfter addition
5. temperaturethe solution was slowly warmed to room temperature
6. customThe solvents were removed in vacuo
7. dissolutionThe resulting gel was dissolved in toluene
8. filtrationfiltered through Celite
9. customToluene was then removed in vacuo
10. customleaving an orange-yellow oil

ORD record

ord-85c2580850c34eb1bdf510326029439e

Source dataset

uspto-grants-2007_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07217848B2