SEARCH Articles Figures Tables 2- pyridine, photoinduced proton transfer 2.3- Dimethyl pyridine, protonated Protonated pyridine Protonated pyridine Protonation of pyridine Pyridine ring protonization Pyridine ring protonization temperature Pyridines proton abstraction Pyridines proton exchange Pyridines protonation shifts Pyridines protonation, regioselectivity Pyridines protonic salts