Although a description of the high pressure formylation of benzene utilizing the Gattermann- Koch reaction is available, 2 there are only patent report~~ $~~~ on the pressure formylation of an alkylbenzene. The high pressure formylation of isopropylbenzene and the side reactions have been studied. The reaction of isopropylbenzene and carbon monoxide under pressure with aluminum chloride and hydrogen chloride as catalysts gives chiefly p- ...