Hydrochloric Acid → Florox reagent

Participants

Reaction Conditions

Reaction Steps

N-(Pentafluorobenzyloxy)phthalimide 15.9 g, 46 mmol), n-butylamine (3.7 g, 50 mmol) and absolute ethanol (90 ml) were placed in a dry flask under a nitrogen atmosphere. This reaction mixture was stirred at 60° C. for 1 hour, cooled and adjusted to pH 3 using dry hydrogen chloride gas. The resulting white precipitate was filtered and the crystals washed with ice-cold ethanol/ether (1:1). The filtrate was concentrated to give a second crop of crystals. The combined yield of the hydroxylamine hydrochloride was 11.15 g, 99%, m.p. (sublimed) 150°. Analysis: (Found: C, 33.7; H. 2.2; Cl, 13.9; F, 37.8; N, 5.7, C7H5ClF5NO requires C, 33.7; H, 2.0; Cl, 14.2; F, 38.1; N, 5.6%).

Provenance & Evidence