The cationic polymerization/oligomerization of [1,2-(methylenedioxy)-4-propenyl benzene] (isosafrole), was conducted under a variety of conditions. When products were obtained they proved to be very low molecular weight materials (DP = 3-8). The reaction temperature and/or the presence or absence of solvent had the most significant impact on product yield and molecular weight. In most cases polymerization proceeded through the propenyl group, although at higher reaction temperatures there was evidence of reaction with the methylenedioxy group.