Dimethyl Sulfoxide → HCID 10825624, Verbindung

Temperatur

50 °C

A suspension of 60%) NaH (876 mg, 0.022 mol) in THF (30 ml)-DMSO (50 ml) was heated to an external temperature of 50° C., followed by the addition of trimethylsulfoxonium iodide (4.8 g, 0.022 mol) in portions. After stirring at the same temperature for one hour, the reaction mixture was cooled to −20° C. and added dropwise with a solution of 2-ethylthio-2,2,2′,4′-tetrafluoroacetophenone (4.6 g, 0.018 mol) in THF (20 ml). The resulting mixture was stirred at room temperature for 2 hours. The reaction mixture was then poured into ice water, followed by extraction with ethyl acetate. The extract was washed successively with water and saturated saline and dried over magnesium sulfate. The solvent was then distilled off under reduced pressure, whereby 2-(2,4-difluorophenyl)-2-[(ethylthio) (difluoro)methyl]oxirane (4.3 g, yield: 90.0%) was obtained as a pale yellow oil.

1. temperaturethe reaction mixture was cooled to −20° C.
2. stirringThe resulting mixture was stirred at room temperature for 2 hours
3. extractionfollowed by extraction with ethyl acetate
4. washThe extract was washed successively with water and saturated saline
5. dry with materialdried over magnesium sulfate
6. distillationThe solvent was then distilled off under reduced pressure

ORD-Eintrag

ord-e1027647c9b24dc9b283a9c4ff73d55b

Quelldatensatz

uspto-grants-2001_02

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06194592B1