Ammonium Chloride → 2-Methyl-4-phenylthiophene
Reaktionsgleichung
[C:1]1([Mg]Br)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.Br[C:10]1[CH:11]=[C:12]([CH3:15])[S:13][CH:14]=1.[NH4+].[Cl-]>CCOCC>[CH3:15][C:12]1[S:13][CH:14]=[C:10]([C:1]2[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=2)[CH:11]=1Komponenten
5
Edukt 3
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Versuchsvorschrift
A solution of PhMgBr (prepared from 1.65 g of Mg (0.0678 mol) and 10.64 g of PhBr (0.0678 mol) in 40 mL of diethyl ether) was added to a mixture of 10 g (0.0565 mol) of 4-bromo-2-methylthiophene and 0.62 g (0.0012 mol) of NiCl2dppp in 50 mL of ether under stirring at reflux. The reaction mixture was refluxed for additional 3 h and then stirred overnight. The resulting mixture was treated with 10% aqueous NH4Cl, the organic layer was separated, washed with 10% aqueous NH4Cl and then dried with anhydrous Na2SO4. Solvent was evaporated, the residue was recrystallized from methanol. Yield 6.8 g (70%) of colorless crystals.