反应详情

A mixture of 2,2-difluoro-5-methoxy-1-pentanal hydrate (1.57 g, 9.2 mmoles), hydroxylamino hydrochloride (640 mg, 9.2 mmoles), 1N NaOH (9.2 ml), and dioxane (15 ml) is kept for 1 hour at room temperature. After addition of ether and brine, usual extraction gives an oil which according to NMR is the oxime hydrate. Several evaporations with carbon tetrachloride (50° C., 60 mm Hg) afford the oxime (1.4 g) which is purified by chromatography on silica (ethyl acetate/petroleum ether: 20/80, RF: 0.53): 1.05 g (68%).

1. customgives an oil which