Bromine → Ethyl 8-acetyl-12-(acetyloxy)-8-bromoheptadecanoate
Reaktionsgleichung
[Br:1]Br.[C:3]([CH:6]([CH2:18][CH2:19][CH2:20][CH:21]([O:27][C:28](=[O:30])[CH3:29])[CH2:22][CH2:23][CH2:24][CH2:25][CH3:26])[CH2:7][CH2:8][CH2:9][CH2:10][CH2:11][CH2:12][C:13]([O:15][CH2:16][CH3:17])=[O:14])(=[O:5])[CH3:4]>C(Cl)(Cl)(Cl)Cl>[C:3]([C:6]([Br:1])([CH2:18][CH2:19][CH2:20][CH:21]([O:27][C:28](=[O:30])[CH3:29])[CH2:22][CH2:23][CH2:24][CH2:25][CH3:26])[CH2:7][CH2:8][CH2:9][CH2:10][CH2:11][CH2:12][C:13]([O:15][CH2:16][CH3:17])=[O:14])(=[O:5])[CH3:4]Komponenten
4
Edukt 2
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Versuchsvorschrift
Bromine (16.7 g., 0.104 mole) dissolved in carbon tetrachloride (100 ml.) is added dropwise to a stirred solution of ethyl 8-acetyl-12-acetoxyheptadecanoate (Example 1, Step C) (37.4 g., 0.094 mole) in carbon tetrachloride (200 ml.) during one hour. The solvent is distilled in vacuo. The residual oil is dissolved in ether and washed with dilute sodium bicarbonate, water and brine and dried over sodium sulfate. Evaporation of the ether leaves the crude bromo ester as a yellow oil weighing 43 g. It is purified by column chromatography on silica gel with benzene as the eluant. This procedure serves to separate the desired bromo ester from a small amount of a by-product, ethyl 8-bromoacetyl-8-bromo-12-acetoxyheptadecanoate. Ethyl 8-acetyl-8-bromo-12-acetoxyheptadecanoate is thus obtained as a pale yellow oil weighing 12.7 g. (28%.