1: glacial AcOH / ethanol / 4 h / Heating 2: 1.) conc.HCl, NaNO2 / 1.) glacial AcOH, H2O, 0 - 5 deg C, 2.) pyridine, below 10 deg C - room temp. View Scheme

1: glacial AcOH / ethanol / 4 h / Heating 2: 1.) conc.HCl, NaNO2 / 1.) glacial AcOH, H2O, 0 - 5 deg C, 2.) pyridine, below 10 deg C - room temp. View Scheme

hydrogenchloride; sodium nitrite 1.) glacial AcOH, H2O, 0 - 5 deg C, 2.) pyridine, below 10 deg C - room temp.; Yield given. Multistep reaction;