1: 88 percent / m-chloroperoxybenzoic acid, 4,4'-thiobis-(6-t-butyl-3-methylphenol) / 1,2-dichloro-ethane / 9 h / Ambient temperature 2: H2 / 10percent Pd-C / ethanol / Ambient temperature 3: oxidation with Jones reagent 4: 92 percent / conc. H2SO4 / 0.08 h / 0 °C View Scheme