Need help with Friedel Crafts alkylation Hi. In my laboratory text book there is an explanation on how to make 1,4-Di-t-butyl-2,5-dimethoxybenzene from p-Dimethoxybenzene, tert-butanol and sulfuric acid. I am to put acetic acid and t-butyl alcohol to the p-Dimethoxybenzene. What my textbook doesn't explain is what does the acetic acid do in the reaction. Could someone please explain to me. Thanks.