Bromine → HCID 18399626, Verbindung
Reaktionsgleichung
[Br:1]Br.[C:3]([C:6]1[S:7][CH:8]=[C:9]([C:20]([O:22][CH3:23])=[O:21])[C:10]=1[O:11][C:12](=[O:19])[C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1)(=[O:5])[CH3:4]>ClC(Cl)(Cl)Cl>[Br:1][CH2:4][C:3]([C:6]1[S:7][CH:8]=[C:9]([C:20]([O:22][CH3:23])=[O:21])[C:10]=1[O:11][C:12](=[O:19])[C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1)=[O:5]Komponenten
4
Edukt 2
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Reaktionsbedingungen
- Temperatur
- 22.5 °C
Versuchsvorschrift
A solution of 1.28 mL of bromine in 24 mL of tetrachloromethane was added dropwise to a solution of 7.23 g of Compound 1C in 72 mL of tetrachloromethane over a period of 10 minutes and stirred at reflux. After a further 5 minutes at reflux, the mixture was cooled to 20-25° C. The precipitated solid was collected by filtration and washed with cold tetrachloromethane to yield 7 g (77%) of Compound 1D, melting at 115-118° C. The compound was contaminated with impurities 1B and methyl 2-(2,2-dibromoacetyl)-3-benzoyloxythiophene-4-carboxylate (2% and 6% mol. respectively, determined by 1H-NMR spectroscopy), but could be used without further purification in the next reaction step.