chromium(VI) oxide; water; silica gel; lithium diisopropyl amide 1) THF, 0 deg C, 3 h; Yield given. Multistep reaction;

<b>Multi-step reaction with 2 steps<br /> </b>1: 80 percent / acetonitrile / Heating<br />2: 85 percent / aq. Na₂CO₃ / Pd(PPh₃)4 / 1,2-dimethoxy-ethane / Heating<br /> <br /> &nbsp;