Heterocyclic Mesomeric Betaines and Mesoionic Compounds

Preface Eric Scriven and Christopher A. Ramsden 1. Heterocyclic mesomeric betaines: An overview Christopher A. Ramsden 2. Developments in the chemistry of 1,3a,6a-triazapentalenes and their fused analogs Yingchun Wang, Tomas Opsomer and Wim Dehaen 3. Type A mesoionic compounds (1980-2020) Christopher A. Ramsden and Florea Dumitrascu 4. Type B mesoionic compounds (1980-2020) Florea Dumitrascu and Christopher A. Ramsden 5. Meso-ionic compounds W. David Ollis and Christopher A. Ramsden 6. Meso-ionic heterocycles (1976-1980) Christopher G. Newton and Christopher A. Ramsden

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1,2,3-Triazole; 1,3a,6a-Triazapentalenes; 1,3-Dipolar cycloadditions; 1,3-Dipole; 1,3-Dipoles; 1,4-Dipole; Aromaticity; Cross-conjugation; Cycloaddition; Cycloadditions; Five-membered rings; Heterocycle; Insertion; Isomuenchnones; Mesoionic; Mesomeric betaine; Mesomeric betaines; Munchnones; Muenchnones; N-heterocyclic carbenes; Nitrenes; Organic fluorophores; Pyrazole; Semi-conjugated; Sydnones; Synthetic methodology; Thioisomuenchnones; Type A; Type B; Valence tautomerism