SEARCH Articles Figures Tables Alkyl amines protonation Amine proton exchange Amines cyclic proton transfer Amines proton affinities Amines protonation shifts Amines, protonation Amines, protonation Nitrogen proton affinities and amine basicity Primary amines protonation Proton exchange amine ligands Proton transfer from amines Proton-transfer step, amine-catalyzed Proton-transfer step, amine-catalyzed mechanism Protonated Amine Catalysts Protonated amine cations Protonated amines Protonated amines Protonated cyclopropane from amines Protons on Nitrogen Amines Tertiary amines protonation