1: 83.3 percent / H2 / Raney-Nickel / ethanol / Ambient temperature 2: 81.7 percent / 17percent aq. HCl, NaNO2 3: 38.4 percent / conc. H2SO4, H2SO4(65percent SO3), boric acid / 0.5 h / 120 °C View Scheme

1: 83.3 percent / H2 / Raney-Nickel / ethanol / Ambient temperature 2: 81.7 percent / 17percent aq. HCl, NaNO2 3: 38.4 percent / conc. H2SO4, H2SO4(65percent SO3), boric acid / 0.5 h / 120 °C 4: 93.7 percent View Scheme

aluminium trichloride T=110 - 120°C; 3 h;

hydrogen; nickel in ethanol Ambient temperature;

1: 83.3 percent / H2 / Raney-Nickel / ethanol / Ambient temperature 2: 81.7 percent / 17percent aq. HCl, NaNO2 View Scheme