1: sodium sulfate; hydrogenchloride; hydroxylamine hydrochloride / water / 2 h / |Reflux 2: sulfuric acid / water / 1 h / 50 - 80 °C View Scheme

1: N-chloro-succinimide / tetrahydrofuran / 1 h / 0 °C 2: sodium sulfate; hydrogenchloride; hydroxylamine hydrochloride / water / 2 h / |Reflux 3: sulfuric acid / water / 1 h / 50 - 80 °C View Scheme

T=180°C;