1: 80 percent / gl. acetic acid / ethanol / 5 h / Heating 2: 1) aq. NaNO2, gl. acetic acid, HCl / 1) 0-5 deg C, 2) pyridine, r.t., overnight View Scheme

1: 80 percent / gl. acetic acid / ethanol / 5 h / Heating 2: 1) aq. NaNO2, gl. acetic acid, HCl / 1) 0-5 deg C, 2) pyridine, r.t., overnight View Scheme

hydrogenchloride; acetic acid; sodium nitrite 1) 0-5 deg C, 2) pyridine, r.t., overnight; Yield given. Multistep reaction;