hydrogenchloride in tetrahydrofuran 16 h; Ambient temperature;

1.1: CeCl3 / toluene; pentane / -78 °C 1.2: 93 percent / toluene; pentane / -78 °C 2.1: aq. HF 3.1: TiCl4; 2,6-lutidine / CH2Cl2 / -45 °C View Scheme

dimethylsulfide; oxygen; ozone 1) MeOH, -78 deg C; 2) room temp.; Yield given. Multistep reaction;