Cyanogen Bromide → 1-Bromo-4(S)-acetyloxy-2-nonyne

Participants

Reaction Steps

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).

Provenance & Evidence