1: 60 percent / chromous chloride / acetone / 1 h / 20 °C 2: 99 percent / trifluoroacetic acid 3: 59 percent / K2CO3 / butan-2-one / 6 h / Heating 4: 1.) borane, 2.) NaOH, 30percent H2O2 / 1.) THF, 20 deg C, 15 min, 2.) 20 deg C, 15 min 5: 1.) AlCl3, 2.) conc. HCl / 1.) nitrobenzene, room temperature, 12 h, 2.) water, 20 deg C, 7 d 6: 66 percent / dicyclohexylcarbodi-imide, dimethyl sulphoxide View Scheme

1: BaO 2: (i) B2H6, (ii) aq. H2O2, NaOH 3: AlCl3 4: DCC, DMSO, Py, CF3CO2H View Scheme

1: Zn, AcOH 2: BaO 3: (i) B2H6, (ii) aq. H2O2, NaOH 4: AlCl3 5: DCC, DMSO, Py, CF3CO2H View Scheme

1: (i) B2H6, (ii) aq. H2O2, NaOH 2: AlCl3 3: DCC, DMSO, Py, CF3CO2H View Scheme

1: AlCl3 2: DCC, DMSO, Py, CF3CO2H View Scheme

1: 24 percent / H2SO4 / 2.5 h / -5 - 0 °C 2: 54 percent / AlCl3; NaCl / 180 °C View Scheme

1: 1.) AlCl3, 2.) conc. HCl / 1.) nitrobenzene, room temperature, 12 h, 2.) water, 20 deg C, 7 d 2: 66 percent / dicyclohexylcarbodi-imide, dimethyl sulphoxide View Scheme

1: 1.) borane, 2.) NaOH, 30percent H2O2 / 1.) THF, 20 deg C, 15 min, 2.) 20 deg C, 15 min 2: 1.) AlCl3, 2.) conc. HCl / 1.) nitrobenzene, room temperature, 12 h, 2.) water, 20 deg C, 7 d 3: 66 percent / dicyclohexylcarbodi-imide, dimethyl sulphoxide View Scheme

1: 83 percent / HCl / ethanol; tetrahydrofuran; acetic acid / 1.) EtOH, THF, 0 deg C, 20 min.; 2.) AcOH, 0 deg C., 30 min; 3.) rt. overnight 2: 94 percent / HCl / acetic acid / 9 h / Heating 3: tetrahydrofuran; hexamethylphosphoric acid triamide / 18 h / Ambient temperature 4: 56 percent / trimethylsilyl triflate / tetrahydrofuran; hexamethylphosphoric acid triamide; diethyl ether / 1.) -20 deg C, 15 min.; 2.) -40 deg C, 2 h.; 3.) -40 deg C, 1 h. View Scheme

sulfuric acid; ethylmagnesium bromide; mercury(II) oxide Yield given. Multistep reaction;