hydrogen; palladium on activated charcoal in methanol

1: D-(-)-diethyltartrate, titanium tetraisopropoxide, molecular sieves 4A, tert-butylhydroperoxide / CH2Cl2 / 3 h / -20 °C 2: 2.3 mg / H2 / PtO2 / ethanol / 1 h / Ambient temperature View Scheme

1: benzene; phosphorus (III)-bromide 2: tert-butyl alcohol / beim Erhitzen des erhaltenen Dodeca-3t,9t-dien-5,7-diin-1,1,12,12-tetracarbonsaeure-tetra-tert-butylesters 3: aqueous KOH-solution View Scheme

chromium(VI) oxide; sulfuric acid in acetone