1: BH3, pyridine / trifluoroacetic acid / 2 h / Ambient temperature 2: 10percent aq. NaOH / Ambient temperature 3: 3 h / Ambient temperature 4: 4-N,N-dimethylaminopyridine / pyridine / 24 h / Ambient temperature 5: 10percent Pd/C / cyclohexane / 1 h / Heating 6: 1) (CF3CO)2O, CF3COOH, 2) MeOH / 1) 0 deg C, 1 h 7: 90 percent / SO3, NEt3 / dimethylsulfoxide 8: 40 percent / AlCl3, air / nitrobenzene View Scheme