1: acetic anhydride / 0.25 h / Ambient temperature 2: 10percent aq. NaOH, 30percent aq. H2O2 / acetone / 0.5 h / Ambient temperature 3: 1.) NaH / 1.) DMF, RT, 5 min, 2.) DMF, 50 deg C, 17 h 4: 22 percent / tetrahydrofuran; diethyl ether / 1 h / Ambient temperature View Scheme

Ru(2 wt)/CeO2 in 1,3,5-trimethyl-benzene T=170°C; 24 h; Inert atmosphere;

tri-tert-butyl phosphine; caesium carbonate; [RhCl(η2:η2-cycloocta-1,5-diene)]2 in hexane; xylene 24 h; Heating;

aluminium trichloride in carbon disulfide 6 h; Heating;