1: 46 percent / 3-chloroperbenzoic acid / CH2Cl2 / 12 h / Ambient temperature 2: 1.) diphenylphosphine, butyllithium, 2.) methyl iodide / CH2Cl2 / 12 h / Ambient temperature; 1.) THF, hexane, room temp., 7 h, 2.) 30 min 3: 90 percent / acetic acid / 6 h / 40 °C View Scheme

amberlite resin IR 120 in tetrahydrofuran; water 4 h; Heating;