1,2-Difluoro-3-prop-2-ynyloxybenzene → 7,8-Difluorochroman
Reaktionsgleichung
[F:1][C:2]1[C:11]([F:12])=[C:10]2[C:5]([CH:6]=[CH:7][CH2:8][O:9]2)=[CH:4][CH:3]=1.FC1C=CC=C(OCC#C)C=1F>C1COCC1.[Pd]>[F:1][C:2]1[C:11]([F:12])=[C:10]2[C:5]([CH2:6][CH2:7][CH2:8][O:9]2)=[CH:4][CH:3]=1Komponenten
5
Edukt 2
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 2
Versuchsvorschrift
A mixture of 7,8-difluoro-2H-chromene and 1,2-difluoro-3-prop-2-ynyloxybenzene (43.2 g) is hydrogenated at RT for 1 h in 430 ml of THF in the presence of Pd/C (5% of Pd). The batch is evaporated to dryness, and the crude product is purified by column chromatography (SiO2, n-pentane: 1-chlorobutane=4:1), giving pure 7,8-difluorochroman as a pale-yellowish liquid.
Aufarbeitung
- customThe batch is evaporated to dryness
- customthe crude product is purified by column chromatography (SiO2, n-pentane: 1-chlorobutane=4:1)
Quellen und Nachweise
- ORD-Eintrag
- ord-b963f135725b47d0b355aa9d03ed52d0
- Quelldatensatz
- uspto-grants-2012_11
- Patentnummer
- US08303844B2
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