titanium(IV) isopropylate; tert.-butylhydroperoxide; L-(+)-DIPT in dichloromethane T=-15°C; 10 h;

dipyridinium dichromate

1: lithium aluminiumhydride / tetrahydrofuran / 3 h / Ambient temperature 2: 60 percent / Fetizone reagent (silver carbonate on celite powder) / benzene / 2 h / Heating 3: 70 percent / aluminium chloride, sodium chloride / 0.08 h / 180 °C View Scheme