SEARCH Articles Figures Tables 1,3-cycloaddition intramolecular Alder Cycloaddition Cycloaddition reaction intramolecular Cycloaddition reactions Diels-Alder reaction Cycloaddition reactions intramolecular cycloadditions Diels cycloaddition Diels cycloaddition reactions Diels intramolecular Diels intramolecular reaction Diels-Alder cycloaddition Diels-Alder cycloadditions Diels-Alder reaction 2 + 2] cycloaddition Facilitators Facilitization Intramolecular Diels-Alder Intramolecular Diels-Alder cycloaddition Intramolecular reactions Diels-Alder cycloaddition