potassium hydroxide; boron trifluoride 1.) EtOH, ultrasound, room temperature, 30 min, 2.) MeOH, 10 min; Yield given. Multistep reaction;

1: 1.) KOH, 2.) BF3*MeOH / 1.) 95percent aq. EtOH, sonication, 30 min, r.t., 2.) MeOH, reflux, 10 min 2: 95 percent / aq. Hg(OAc)2 / tetrahydrofuran / 0.33 h / Ambient temperature 3: 85 percent / aq. Na2Cr2O7, H2SO4 / diethyl ether / 0.25 h / Ambient temperature View Scheme