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Ammonium and cycloammoniumylids
Pyridinium and benzopyridiniumylids
2 other sections not shown
2-dipolar cycloaddition acid acyl addition adduct affording alkyl Amer amine ammonium Angew anion aromatic assumed aziridine benzene benzoyl betaine bromide carbanion carbanion-disubstituted carbon atom carbonyl cation Chem Chim chloride cleavage compounds converted crystals m.p. cyclization cycloaddition reactions decomposition dehydrogenation delocalization derivatives diazomethane diazonium-ylids dienophile dimer dimethyl acetylenedicarboxylate diphenyldiazomethane dipolar dipolarophile dipole DMAD double bond electron elimination ester ethylene formation formed halide heterocyclic Huisgen hydrogen hydroxide imidochloride immonium-ylid inactivation indolizine intramolecular isolated isomerization isoquinoline isoquinolinium-ylids Krohnke maleic anhydride mechanism methyl mixture molecular molecule N-ylid nitrile-ylids nitrogen atom nucleophilic nucleophilic attack obtained occurred olefines oxide Petrovanu phenyl phenyllithium phthalazine phthalazinium-ylids prepared presence proton pyridazine pyridine pyridinium pyridinium-ylids pyrrolidine quaternary react reactive reagent resonance structures solvent stable steric Stevens rearrangement studied substituted Tetrahedron Letters tetramethylammonium treating triethylamine Wittig workers yields ylid ylidic ylidic carbanion ylidic intermediate Zugravescu zwitterionic