betaines

https://doi.org/10.1351/goldbook.B00637
Originally, the compound betaine, (CH3)3N+–CH2C(=O)ON,N,N-trimethylammonioacetate, and similar zwitterionic compounds derived from other amino acids. By extension, neutral molecules having charge-separated forms with an @O04291@ atom which bears no hydrogen atoms and that is not adjacent to the anionic atom. Betaines cannot be represented without formal charges. E.g.
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See also:
dipolar compounds
,
mesoionic compounds
,
ylides
,
zwitterionic compounds/zwitterions
Source:
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1322 [Terms] [Paper]