hydrogen; [rhodium(I)(carbonyl)2(acetylacetonate)] in dichloromethane T=25°C; P=9750.98 Torr; 24 h;

1: 55 percent / 60percent H2SO4 / 2.5 h / 130 °C 2: 70 percent / polyphosphoric acid / 2.5 h / 100 °C 3: 22.5 g / 15percent methanolic HCl / 30 h / Ambient temperature 4: 9.62 g / NaBH4 / methanol / 2 h / Ambient temperature 5: 35 percent / t-butyl chromate / CCl4 / 24 h / Heating 6: 3.25 g / aluminium isopropoxide / propan-2-ol / 6 h / Heating 7: 3.2 g / POCl3 / benzene / 2.5 h / Ambient temperature 8: 1.86 g / NaOH / methanol; H2O / 2 h / Heating 9: 1.6 g / Jones' reagent / acetone / 0.17 h / -10 °C 10: 0.96 g / diethyl ether View Scheme

sulfuric acid T=130°C; 2.5 h;

(i) aq. H2SO4, HClO4, (ii) (heating), polyphosphoric acid; Multistep reaction;