Study on Catalytic Synthesis of 2-Isopropyl-1,3-benzodioxolane by Fluosulfonic Acid Resin

Isopropyl-1,3-benzodioxolane was synthesized from catechol and isobutyric aldehyde by using fluosulfonic acid resin as catalyst.The effects of ratio of reactants, amount of catalyst and amount of dehydrating agent were investigated .The results showed that the optimum process conditions were as follows:catechol∶isobulyric aldehyde∶catalyst∶dehydrating agent was 1 mol∶1.5 mol∶10 g∶250 mL;reaction temperature was reflux temperature;reaction time was about 4 h. The yield can reach 92.6 % under the optimum conditions and the catalyst can be used repeatedly.