Mesomeric betaine

Mesomeric betaines are dipolar heterocyclic compounds in which both the negative and the positive charges are delocalized.[1]

Examples are mesoionic compounds and heteropentalenes (e.g. diazapentalenes). Heteropentalenes are not mesoionic.[2]

References
  1. Ollis, W.David; Stanforth, Stepher P.; Ramsden, Christopher A. (1985). "Heterocyclic mesomeric betaines". Tetrahedron. 41 (12): 2239–2329. doi:10.1016/S0040-4020(01)96625-6.
  2. Kawase, Masami (2009). "The Chemistry of Bioactive Mesoionic Heterocycles". Bioactive Heterocycles VII. Topics in Heterocyclic Chemistry. 16. Springer. p. 135–152. doi:10.1007/7081_2007_096. ISBN 978-3-642-00335-6.

Further reading
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