1: 61 percent / trifluoroacetic anhydride, ammonium nitrate / 2 h 2: 85 percent / SnCl2*2H2O / ethyl acetate / 0.33 h / Heating 3: 1.) 23percent H2SiF6, HOAc, butyl nitrite / 2.) xylene, 130 deg C, 15 min View Scheme

1: 85 percent / SnCl2*2H2O / ethyl acetate / 0.33 h / Heating 2: 1.) 23percent H2SiF6, HOAc, butyl nitrite / 2.) xylene, 130 deg C, 15 min View Scheme

H2SiF6; n-Butyl nitrite; acetic acid 2.) xylene, 130 deg C, 15 min; Yield given. Multistep reaction;