1: 1.) KBr, 2.) t-BuOOH, vanadyl acetylacetonate / 1.) AcOH-H2O-THF, 5 deg C, 12 h, 2.) benzene, 23 deg C, 130 min 2: 1.) trifluorometanesulphonic anhydride - pyridine, 2.) hexamethylphosphorous triamide / 1.) CH2Cl2, 0 deg C, 40 min, 2.) 0 deg C, 30 min View Scheme

pyridine; trifluoromethylsulfonic anhydride; tris-(dimethylamino)-phosphine 1.) CH2Cl2, 0 deg C, 40 min, 2.) 0 deg C, 30 min; Yield given. Multistep reaction. Yields of byproduct given;