sodium methylate in pyridine 5 h; Ambient temperature;

1: 64.5 percent / 96percent H2SO4 / Ambient temperature; overnight 2: 72 percent / NaOCH3 / pyridine / 5 h / Ambient temperature View Scheme

1: 88.5 percent / p-toluenesulfonic acid monohydrate / benzene / 12 h / Heating 2: 64.5 percent / 96percent H2SO4 / Ambient temperature; overnight 3: 72 percent / NaOCH3 / pyridine / 5 h / Ambient temperature View Scheme

hydroxylamine hydrochloride in acetic acid T=170°C; 0.25 h;