1: 1.) O3, 2.) (CH3)2S / 1.) CH2Cl2, CH3OH, -78 deg C, 2.) CH2Cl2, CH3OH, from -78 deg C to 25 deg C 2: CrO3, H2SO4 / H2O; acetone View Scheme

dimethylsulfide; ozone 1.) CH2Cl2, CH3OH, -78 deg C, 2.) CH2Cl2, CH3OH, from -78 deg C to 25 deg C; Multistep reaction;