1: 77 percent / CuI, Et3N / Pd(PPh3)2Cl2 / 16 h / 120 °C 2: 67 percent / 3 N Na2CO3, 15percent H2O2 / acetone; H2O / 24 h / Ambient temperature 3: 16 percent / HgSO4, conc. H2SO4 / acetone; H2O / 48 h / Heating View Scheme

1: 77 percent / CuI, Et3N / Pd(PPh3)2Cl2 / 16 h / 120 °C 2: 67 percent / 3 N Na2CO3, 15percent H2O2 / acetone; H2O / 24 h / Ambient temperature 3: 16 percent / HgSO4, conc. H2SO4 / acetone; H2O / 48 h / Heating View Scheme

in N,N-dimethyl-formamide Castro reaction; RefluxInert atmosphere;

1: 67 percent / 3 N Na2CO3, 15percent H2O2 / acetone; H2O / 24 h / Ambient temperature 2: 16 percent / HgSO4, conc. H2SO4 / acetone; H2O / 48 h / Heating View Scheme

potassium acetate