The 1-ethyl-3,4-dimethoxybenzene is treated with bromine in the presence of light to provide the compound A regioselectively. A is then reacted with 2-bromophenol and potassium hydride in DMF isolating, after separation and purification, a compound B and a compound C with 75% and 15% yield respectively. The major compound B it is treated first with magnesium and then with allyl bromide. It represents the structures of compounds A-D and the mechanisms of the reactions involved.