1: 85 percent / triton B 5percent / 1,2-dimethoxy-ethane; methanol / 24 h / 22 °C 2: 2.) CF3CO2H / 1.) benzene, 50 deg C, 1h; 2.) CHCl3, RT, 10 min View Scheme

1: MeONa / methanol / 1 h / Ambient temperature 2: 85 percent / triton B 5percent / 1,2-dimethoxy-ethane; methanol / 24 h / 22 °C 3: 2.) CF3CO2H / 1.) benzene, 50 deg C, 1h; 2.) CHCl3, RT, 10 min View Scheme

trifluoroacetic acid 1.) benzene, 50 deg C, 1h; 2.) CHCl3, RT, 10 min; Yield given. Multistep reaction;