1: aq. NaIO4 / methanol; tetrahydrofuran / 48 h / Ambient temperature 2: toluene / 72 h / Heating 3: 2) aq. NaOH / 1) CH2Cl2, room temp., 18 h; 2) MeOH, room temp., 4 h View Scheme

1: toluene / 72 h / Heating 2: 2) aq. NaOH / 1) CH2Cl2, room temp., 18 h; 2) MeOH, room temp., 4 h View Scheme

sodium hydroxide 1) CH2Cl2, room temp., 18 h; 2) MeOH, room temp., 4 h; Yield given. Multistep reaction;