1: 84 percent / AcOH, Na2Cr2O7*2H2O, aq. H2SO4 / a) 80-90 deg C, 1 h, b) RT, 12 h 2: 90 percent / 30percent H2O2, aq. 30percent Na2CO3 / ethanol / 45 °C 3: 80 percent / 50percent aq. H2SO4 / 5 h View Scheme

sodium dichromate; sulfuric acid; acetic acid a) 80-90 deg C, 1 h, b) RT, 12 h;