methanol; potassium tert-butylate 1.) DME, -45 deg C, 30 min, 2.) DME, reflux, 15 min; Yield given. Multistep reaction;

1: 60 percent / triton B / tetrahydrofuran / 4 h / Heating 2: 35 percent / HCl / ethanol / 70 h / Ambient temperature 3: 95.2 percent / 10percent aq. NaOH / 0.5 h / Heating View Scheme

N-benzyl-trimethylammonium hydroxide in tetrahydrofuran 4 h; Heating;