1: 1.) BF3*Et2O, 2.) tert-butyl nitrite / 1.) THF, -15 deg C, 2.) THF, 0 deg C, 6 h 2: 12.8 percent / NaBr, aq. HBr, cetyltrimethylammonium bromide <(CTA)Br> / Ambient temperature 3: 1.) Et4NF*xH2O / 1.) DMF, 15 min, 2.) DMF, 100 deg C, 24 h View Scheme