SEARCH Articles Figures Tables Porphyrinic pyridinium ylides Pyridinium Compounds, Ylides, Pyridine N-Oxides Pyridinium N-ylides Pyridinium ylides Pyridinium ylides Pyridinium ylides indolizines Pyridinium ylides, 1,3-dipolar cycloaddition Pyridinium ylides, addition Pyridinium ylides, addition reactions Pyridinium ylides, cycloadditions, indolizine Pyridinium ylides, indolizine