1: 81 percent / H2 / 10percent Pd/C / methanol / 18 h / 1551.4 Torr 2: 68 percent / Me3SiCl, NaI / acetonitrile / 14 h / Heating 3: 68 percent / Br2, red HgO, MgSO4 / CH2Cl2 / 3 h / Heating; Irradiation 4: 75 percent / 1,8-diazabicyclo<5.4.0>undec-7-ene / CHCl3 / 0.25 h / Heating View Scheme

<b>Multi-step reaction with 2 steps<br /> </b>1: 75 percent / CrO₃, conc. H₂SO₄ / acetone; H₂O / 1 h<br />2: 100 percent / CH₂Cl₂ / 18 h<br /> <br /> &nbsp;

<b>Multi-step reaction with 3 steps<br /> </b>1: 82 percent / pyridinium p-toluenesulfonate / ethanol / 36 h / Heating<br />2: 75 percent / CrO₃, conc. H₂SO₄ / acetone; H₂O / 1 h<br />3: 100 percent / CH₂Cl₂ / 18 h<br /> <br /> &nbsp;