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Keywords:

  • acidity;
  • cycloaddition;
  • Diels–Alder reaction;
  • heterogeneous catalysis;
  • zeolites

Abstract

The Diels–Alder reaction between isoprene and methyl acrylate over several zeolites was thoroughly investigated. ZSM-5 zeolites provided the highest productivity in methyl 4-methylcyclohex-3-enecarboxylate isomer, achieving 0.219 mmol product per mmol H+ in 1 hour. In addition, this study highlights the influence of ZSM-5 zeolite’s Brønsted acidity and crystal size on its performance in the Diels–Alder reaction. An optimal configuration between the two reactants within the medium-pore-sized ZSM-5 framework is obtained, thus suggesting the presence of a confinement effect.