SEARCH Articles Figures Tables 1.3- dipolar cycloaddition reactions HOMO-LUMO interaction Cycloaddition reactions HOMO-LUMO interactions Diels-Alder reaction HOMO-LUMO) Diels-Alder reactions HOMO-LUMO interactions HOMO/LUMO HOMOs and LUMOs in Reactions LUMO LUMO-dipole/HOMO-dipolarophile reaction LUMOs