in diphenylether T=225 - 230°C; 1 h;

1: 91 percent / NaHCO3 / dimethylformamide / 12 h / 60 °C 2: 52 percent / diphenyl ether / 1 h / 225 - 230 °C View Scheme

1: 72 percent / 85percent m-chloroperoxybenzoic acid / CH2Cl2 / 20 h / Ambient temperature 2: 41 percent / Jones reagent / acetone / 2 h 3: 95 percent / conc. H2SO4 / 1,2-dichloro-ethane / 1.5 h / Heating 4: dimethylformamide / 9 h / 160 - 163 °C 5: Fe powder / ethanol; acetic acid / 0.5 h / 80 - 85 °C 6: 47 percent / 2,3-dichloro-5,6-dicyano-1,4-benzoquinone / benzene / 16 h / Ambient temperature View Scheme

1: 72 percent / 85percent m-chloroperoxybenzoic acid / CH2Cl2 / 20 h / Ambient temperature 2: 41 percent / Jones reagent / acetone / 2 h 3: 95 percent / conc. H2SO4 / 1,2-dichloro-ethane / 1.5 h / Heating 4: dimethylformamide / 9 h / 160 - 163 °C 5: Fe powder / ethanol; acetic acid / 0.5 h / 80 - 85 °C 6: 68 percent / Cu2Br2, Na2CO3 / various solvent(s) / 5.5 h / 170 °C 7: 81 percent / 2,3-dichloro-5,6-dicyano-1,4-benzoquinone / benzene / 6 h / Heating View Scheme