chromium(VI) oxide; sulfuric acid in acetone T=0°C; 4 h;

1: 58 percent / chromium trioxide; acetic acid / 18 h / 20 °C 2: thionyl chloride / 0.75 h / Heating 3: 540 mg / aluminium chloride / CS2 / 3 h / Heating View Scheme

1: 66 percent / chromium trioxide, 1.5M sulfuric acid / acetone / 4 h / 0 °C 2: thionyl chloride / 2.5 h / Ambient temperature 3: CH2Cl2 / 0.25 h / 0 °C 4: 5 percent / K2CO3, tris(dibenzylideneacetone)dipalladium(0), tri-(o-tolyl)phosphine / toluene / 25 h / 110 °C View Scheme

1: 58 percent / chromium trioxide; acetic acid / 18 h / 20 °C 2: thionyl chloride / 0.75 h / Heating View Scheme