Reaction of 2-acetoxy-cyclohexa-3,5-dienones (“quinol-acetates”) with BF3 or (CH3CO)2O/BF3 in the presence of benzene derivatives (mesitylene, mesitol, 1,3-dimethoxybenzene, 1,3,5-trimethoxybenzene) yields biphenyl and diphenyl methane derivatives. The reasons for their formation are discussed.