SEARCH Articles Figures Tables 1 -Ethyl-4- pyridinyl radical 2-Pyridinyl silver 2-pyridinyl halide 3- Pyridinyl compounds Catalysts pyridinyl Directing groups 2-pyridinyl L-Ethyl-4-carbomethoxy-pyridinyl Pyridinyl analogues Pyridinyl imidazoles Pyridinyl pyrimidines Pyridinyl radical Pyridinyl radical absorption S-(1-Oxido-2-pyridinyl) S-(1-Oxido-2-pyridinyl)-1,1,3,3-tetramethylthiouronium Hexafluorophosphate (HOTT)