1: 90 percent Chromat. / dimethylsulfoxide / 14 h / 165 °C 2: Zn/Cu, POCl3 / diethyl ether / 14 h 3: 1.) copper(I)iodide, methyllithium 4: 1.) 2,6-di-tertbutyl-4-methyl phenol, 2.) sulfuric acid / 1.) toluene, 95 deg C, 20 h, 2.) ethanol, 50 deg C, 24 h 5: 87 percent Chromat. / H2, NaOAc / 10percent palladium on carbon / methanol / 14 h View Scheme