ammonium hydroxide in ethyl acetate pH=2 - 8;

1: phosphorus pentachloride / toluene 2: ammonium hydroxide / ethyl acetate / pH 2 - 8 View Scheme

1.1: hydroxylammonium sulfate / methanol / 1 h / 20 - 40 °C 1.2: 24 h / 0 - 20 °C / pH ~ 9.5 / Inert atmosphere 1.3: pH ~ 7 - 7.5 2.1: phosphorus pentachloride / toluene 3.1: ammonium hydroxide / ethyl acetate / pH 2 - 8 View Scheme