potassium carbonate in acetone Heating;

1.1: aq. HBr / 12 h 2.1: aq. HBr / 12 h / Heating 2.2: 55 percent / NaOH; tetrabutylammonium bromide / tetrahydrofuran; H2O / 12 h / 25 °C View Scheme

hydroxylamine hydrochloride; potassium carbonate in methanol; water 3 h; Heating;