2,5-Dibromopyridine → 5-Bromo-2-(4-octylphenyl)pyridine

Reaktionsgleichung

[Mg].[CH2:2]([C:10]1[CH:15]=[CH:14][C:13](Br)=[CH:12][CH:11]=1)[CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][CH2:8][CH3:9].Br[C:18]1[CH:23]=[CH:22][C:21]([Br:24])=[CH:20][N:19]=1>O1CCCC1>[Br:24][C:21]1[CH:22]=[CH:23][C:18]([C:13]2[CH:14]=[CH:15][C:10]([CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][CH2:8][CH3:9])=[CH:11][CH:12]=2)=[N:19][CH:20]=1

Komponenten

Versuchsvorschrift

A Grignard reagent was prepared from magnesium (2.3 g) and 4-octyl-1-bromobenzene (25 g) dissolved in dry tetrahydrofuran (hereinafter abbreviated to THF, 200 ml). To this Grignard reagent were added 2,5-dibromopyridine (23 g) and tetrakistriphenylphosphin paradiun (0) complex (hereinafter abbreviated to Pd(TPP)4, 0.57 g). The reaction mixture was heated to keep refluxing for about 2 hours. After cooling the mixture, organic matter was extracted from the mixture with ether, followed by sequential washing the extract with aqueous ammonium chloride and distilled water to separate an organic layer which was dried over MgSO4. Filtering off the desiccant and distilling off the solvent from the organic layer, the layer gave a residue which was purified by silica gel column chromatography to give 5-bromo-2-(4-octylphenyl)pyridine (35 g).