1: 51 percent / conc. H2SO4, HNO3 / 4 h / Ambient temperature 2: 62 percent / H2 / 5 percent Pd/C / tetrahydrofuran 3: 67 percent / K2CO3 / acetone / 1 h / Heating 4: 80 percent / benzene / 2 h / Heating View Scheme

1: 62 percent / H2 / 5 percent Pd/C / tetrahydrofuran 2: 67 percent / K2CO3 / acetone / 1 h / Heating 3: 80 percent / benzene / 2 h / Heating View Scheme

in benzene 2 h; Heating;

1: 67 percent / K2CO3 / acetone / 1 h / Heating 2: 80 percent / benzene / 2 h / Heating View Scheme