1,7-Dibromoheptane → 1-Bromo-7-phenylheptane
Reaktionsgleichung
Br[CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][CH2:8][Br:9].[C:10]1([Li])[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=1>C1COCC1>[Br:9][CH2:8][CH2:7][CH2:6][CH2:5][CH2:4][CH2:3][CH2:2][C:10]1[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=1Komponenten
4
Edukt 2
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Versuchsvorschrift
To a stirred solution of 1,7-dibromoheptane (49 g, 0.18 mol) (Aldrich) in THF (300 ml), at -30° C. to -40° C., under N2, was added, dropwise, during 3 h, a solution of phenyllithium (15 g, 0.18 mol) in cyclohexane-ether (2.0M solution, Aldrich). The reaction was allowed to stir at -10° C. to -20° C. for 3 h and at room temperature overnight. After slow, careful dilution with H2O (50 ml), the aqueous layer was extracted with Et2O (2×150 ml). The extracts and the organic layer were combined, dried (Na2SO4) and concentrated to a yellow oil. Distillation through a Vigreaux column provided 22.5 g of 1-bromo-7-phenylheptane, bp 84°-88° C. (0.2 mm), nD24 1.5220.