potassium hydroxide in ethanol 4 h; Heating;

1: 73 percent / pyridine / 2 h / Heating 2: 1.) KOH / 1.) C2H5OH, 2.) C2H5OH, reflux, 6 h 3: 27 percent / KOH / ethanol / 4 h / Heating View Scheme

1: 1.) KOH / 1.) C2H5OH, 2.) C2H5OH, reflux, 6 h 2: 27 percent / KOH / ethanol / 4 h / Heating View Scheme

1: conc. HCl / a) RT, overnight, b) 80 deg C, 6 h 2: 73 percent / pyridine / 2 h / Heating 3: 1.) KOH / 1.) C2H5OH, 2.) C2H5OH, reflux, 6 h 4: 27 percent / KOH / ethanol / 4 h / Heating View Scheme

1: 1.) aq. HCl, NaNO2, 2.) Na2SO3 / 1.) <10 deg C, 30 min, 2.) H2O, RT, 2 h 2: conc. HCl / a) RT, overnight, b) 80 deg C, 6 h 3: 73 percent / pyridine / 2 h / Heating 4: 1.) KOH / 1.) C2H5OH, 2.) C2H5OH, reflux, 6 h 5: 27 percent / KOH / ethanol / 4 h / Heating View Scheme