SEARCH Articles Figures Tables Iminium ions intramolecular Mannich reactions Intramolecular Mannich KLEINMAN R. A. VOLKMANN, Pfizer Central Research, Groton, CT, USA 4 The Intramolecular Mannich and Related Reactions Mannich reaction-aldol condensation, intramolecular Synthetic intramolecular Mannich reaction Tryptamine intramolecular Mannich reaction