1: 100 percent / PdCl2(PhCN)2 / benzene / 2 h / Heating 2: 30percent H2O2, conc. HCl / acetonitrile / 3 h / 50 °C / the excess of H2O2 was removed by catalytic hydrogenation using 10percent Pd-C View Scheme

1: 100 percent / PdCl2(PhCN)2 / benzene / 2 h / Heating 2: 60 percent / 30percent H2O2, conc. HCl / acetonitrile / 3 h / 50 °C / the excess of H2O2 was removed by catalytic hydrogenation using 10percent Pd-C View Scheme