1: 81 percent / 1.) p-toluenesulfonic acid, 2.) chloranil / benzene / 1.) reflux, 2 h, 2.) reflux, 24 h 2: N-bromosuccinimide, benzoyl peroxide / CCl4 / 6 h / Heating 3: 71 percent / 1.) hexamethylenetetramine, 2.) 50percent acetic acid / 1.) chloroform, reflux, 90 min, 2.) reflux, 90 min View Scheme

chloranil; toluene-4-sulfonic acid in benzene 1.) reflux, 2 h, 2.) reflux, 24 h;