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 7: 1.) ethylmagnesium bromide, 3.) conc. H2SO4, HgO View Scheme

1: 60 percent / chromous chloride / acetone / 1 h / 20 °C 2: 99 percent / trifluoroacetic acid View Scheme

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 View Scheme

acetic acid; zinc in diethyl ether T=20°C; 1 h;

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 View Scheme

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 View Scheme

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