pyridine; dimethylsulfide; ozone 1.) dichloromethane, -70 deg C, 2.) dichloromethane, room temperature, 15 h; Yield given. Multistep reaction;

ozone; triethylamine 1.) dichloromethane, -70 deg C, 2.) dichloromethane, room temperature; Yield given. Multistep reaction. Yields of byproduct given;

ozone; triethylamine 1.) dichloromethane, -70 deg C, 2.) dichloromethane, room temperature; Yield given. Multistep reaction. Yields of byproduct given;