1: 78 percent / manganese dioxide / light petroleum / 12 h / Ambient temperature 2: 1.) magnesium / 1.) ether, reflux, 1 h, 2.) reflux, 4 h 3: 1.) toluene-p-sulphonic acid, 2.) hydroquinone / 1.) ether, room temperature, 1 h, 2.) 150 deg C, 24 h View Scheme

1: 1.) magnesium / 1.) ether, reflux, 1 h, 2.) reflux, 4 h 2: 1.) toluene-p-sulphonic acid, 2.) hydroquinone / 1.) ether, room temperature, 1 h, 2.) 150 deg C, 24 h View Scheme

toluene-4-sulfonic acid; hydroquinone 1.) ether, room temperature, 1 h, 2.) 150 deg C, 24 h; Yield given. Multistep reaction;