Hydroxylamine HCl → N-[2,2,2-Trifluoro-1-(4-methoxyphenyl)ethylidene]hydroxylamine

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118.5 g (0.58 mol) of 2,2,2-trifluoro-1-(4-methoxyphenyl)-ethanone are dissolved in 470 ml of ethanol and heated at 80° C. To the solution are added 42.4 g (0.61 mol) of hydroxylammonium chloride and 80.9 g (0.99 mol) of sodium acetate dissolved in 240 ml of water. The reaction mixture is refluxed for 5 hours, and the solvent is distilled off by a rotary evaporator. The residue is poured into 500 ml of water, and a white solid is precipitated. The solid is isolated by filtration and rinsed with water, and purified by recrystallization from toluene, yielding 73.1 g of 2,2,2-trifluoro-1-(4-methoxyphenyl)-ethanone oxime as a white solid. The structure is confirmed by the 1H-NMR spectrum (CDCl3). δ [ppm]: 3.84 (s, 3H), 6.99 (d, 2H), 7.55 (d, 2H), 9.11 (br s, 1H). The spectrum indicates the compound is a single isomer, which is tentatively assigned as Z-conformation.

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