4-Bromophenylhydrazine hydrochloride → HCID 20289483, compound

Participants

Reaction Steps

5-Chloropentanal (ca. 70% pure, 8.0 g) was added to a suspension of 4-bromophenylhydrazine hydrochloride (13.4 g) in aqueous acetic acid (50%, 300 ml). The mixture was heated rapidly to boiling with vigorous stirring and maintained at reflux for 7 hours. The resulting dark brown solution was cooled to room temperature, diluted with water (300 ml) and extracted with ethyl acetate (4×150 ml). The combined extracts were washed with water (200 ml) and saturated aqueous sodium hydrogen carbonate (4×250 ml), dried (MgSO4), filtered and evaporated to a dark brown oil (14.7 g), which was purified on a silica column (Kieselgel 60, 200 g) eluted with ethyl acetate:light petroleum (b.p. 60°-80°) (1:2) followed by bulb to bulb distillation twice in vacuo to give the title compound as a yellow oil (4 g) b.p. 200° C., 0.5 mm, which rapidly darkened on storage.

Provenance & Evidence