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Suggested merging with article on nitrogen inversion, see talk there. |
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{{merge from|Nitrogen inversion}}
In [[chemistry]], '''pyramidal inversion''' is a [[fluxional molecule|fluxional process]] in compounds with a [[pyramid]]al molecule, such as [[ammonia]] (NH<sub>3</sub>) "turns inside out".<ref>{{ cite journal | author1 = Arvi Rauk|author-link2=Leland C. Allen|author2=Leland C. Allen|author-link3=Kurt Mislow|author3=Kurt Mislow | title = Pyramidal Inversion | journal = [[Angewandte Chemie International Edition|Angew. Chem. Int. Ed.]] | year = 1970 | volume = 9 | issue = 6 | pages = 400–414 | doi = 10.1002/anie.197004001 }}</ref><ref> {{GoldBookRef|file=P04956|title=Pyramidal inversion}}</ref> It is a [[Molecular vibration|rapid oscillation]] of the atom and substituents, the molecule or ion passing through a [[Trigonal planar molecular geometry|planar]] [[transition state]].<ref>{{ cite journal | author = J. M. Lehn | author-link = Jean-Marie Lehn | title = Nitrogen Inversion: Experiment and Theory | journal = Fortschr. Chem. Forsch. | year = 1970 | volume = 15 | pages = 311–377 | doi = 10.1007/BFb0050820}}</ref> For a compound that would otherwise be [[Chirality (chemistry)|chiral]] due to a [[stereocenter]], pyramidal inversion allows its [[enantiomer]]s to [[racemize]].
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