Cyanogen Bromide → 1-Bromo-4(S)-acetyloxy-2-nonyne
Reaktionsgleichung
C(N(CC)[CH2:4][C:5]#[C:6][C@@H:7]([O:13][C:14](=[O:16])[CH3:15])[CH2:8][CH2:9][CH2:10][CH2:11][CH3:12])C.N#C[Br:21]>CCOCC>[Br:21][CH2:4][C:5]#[C:6][C@@H:7]([O:13][C:14](=[O:16])[CH3:15])[CH2:8][CH2:9][CH2:10][CH2:11][CH3:12]Komponenten
4
Edukt 2
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Versuchsvorschrift
A solution of 1-diethylamino-4(S)-acetoxy-2-nonyne (50.6 g., 0.20 mole) and cyanogen bromide (21.2 g., 0.20 mole) in ether (250 ml.) is allowed to stand at 25°-27° C. for 18 hours. The ether solution is washed with 5% hydrochloric acid solution, water, and brine and dried over sodium sulfate. The ether is evaporated and the residual oil distilled. After a forerun of diethylcyanamide, there is collected 34.1 g. (65%) of 1-bromo-4(S)-acetoxy-2-nonyne, b.p. 97°-105°/0.2 mm.; [α]D26 -83° (C 3.7, CHCl3).