1: 42 percent / N2 / xylene / 5 h / Heating 2: 83 percent / 1) KOH, H2O; 2) 5 N HCl / 1) reflux, 3.5 h; 2) 0 deg C View Scheme

1: 42 percent / N2 / xylene / 5 h / Heating 2: 83 percent / 1) KOH, H2O; 2) 5 N HCl / 1) reflux, 3.5 h; 2) 0 deg C 3: 83 percent / CuO, Cr2O3 / quinoline / 7.5 h / 190 - 195 °C View Scheme