1: 5percent NaOH / ethanol / 2 h / Heating 2: SOCl2 / 4 h 3: diethyl ether 4: 1.) boron trifluoride etherate, 2.) 10percent aq. HCl / 1.) CH3NO2, 0 deg C, 30 min, 2.) reflux, 1 h View Scheme