SEARCH Articles Figures Tables 1.3- Dipolar cycloaddition nitronates Nitronates cycloadditions Nitrone 1,3-dipolar cycloaddition Nitrones 1,3-dipolar cycloadditions Nitrones cycloaddition Nitrones pyrrolizidines Nitrones, cycloadditions Nitrones, dipolar cycloaddition Pyrrolizidin Pyrrolizidine