1: pyridine / benzene / 2 h / Ambient temperature 2: H2O / 1.5 h / Heating 3: 2.) Ag2CO3 / 1.) toluene, 3 d, room temp., 2.) methanol, 1.5 h reflux View Scheme

1.1: diphenyl phosphoryl azide; 1,8-diazabicyclo[5.4.0]undec-7-ene / N,N-dimethyl-formamide / 3 h / 90 °C 2.1: triphenylphosphine / tetrahydrofuran / 0.17 h / 20 °C 2.2: 28 h / 20 °C View Scheme

chromium(VI) oxide; sulfuric acid in water; acetone Jones Oxidation;