When 1, 3-dimethyl-4-n-propylbenzene is warmed with aluminum chloride, the propyl group migrates to the 5-position without extensive isomerization. Under the same conditions, 1, 3- dimethyl-4-isopropylbenzene yields 1, 3-dimethyl-5-isopropylbenzene. The alkylation of m- xylene with n-propyl chloride yields 1, 3-dimethyl-5-n-propylbenzene, 1, 3-dimethyl-5- isopropylbenzene and a small amount of 1, 3, 4-trialkylbenzene.
