hydroquinone 1.) dioxan, RT, 12 h, 2.) dioxan, toluene, reflux, 16 h; Yield given. Multistep reaction. Yields of byproduct given;

With  dimethylsulfide; ozone  1.) dichloromethane, methanol, pyridine, -80 to -70 deg C, 30 min, 2.) -70 to -10, 60 min;  Multistep reaction;