1: 65 percent / benzene / 10 h / Heating 2: 82 percent / hydrazine hydrate / butan-1-ol / Heating 3: POCl3 / 3 h 4: 80 percent / butan-1-ol / 5 h / Heating View Scheme

1: 65 percent / benzene / 10 h / Heating 2: 82 percent / hydrazine hydrate / butan-1-ol / Heating 3: POCl3 / 3 h View Scheme

hydrazine hydrate in ethanol 5 h; Heating;