tetraethylammonium p-toluenesulfonate in isopropyl alcohol Ambient temperatureelectroreduction, Sn catode, carbon rod anode;

1: 94 percent / anhyd. NaOAc, anhyd. Na2CO3 / ethanol / 2 h / Heating 2: 40 h / Heating View Scheme

1: 49 percent / p-Toluenesulfonic acid, 4A molecular sieves / toluene / 240 h / Heating 2: benzene / 60 h / Heating 3: 1.5 percent / Hydroxylamine hydrochloride, hydrochloric acid / ethanol; H2O / 4 h / Heating View Scheme

1: benzene / 60 h / Heating 2: 1.5 percent / Hydroxylamine hydrochloride, hydrochloric acid / ethanol; H2O / 4 h / Heating View Scheme

40 h; Heating; Yield given. Title compound not separated from byproducts;