https://en.wikipedia.org/wiki/Ring_flip
In organic chemistry, a ring flip (also known as a ring inversion or ring reversal) is the interconversion of cyclic conformers that have equivalent ring shapes (e.g., from a chair conformer to another chair conformer) that results in the exchange of nonequivalent substituent positions.[1] The overall process generally takes place over several steps, involving coupled rotations about several of the molecule's single bonds, in conjunction with minor deformations of bond angles. Most commonly, the term is used to refer to the interconversion of the two chair conformers of cyclohexane derivatives, which is specifically referred to as a chair flip, although other cycloalkanes and inorganic rings undergo similar processes.



Chair flipAs stated above, a chair flip is a ring inversion specifically of cyclohexane (and its derivatives) from one chair conformer to another, often to reduce steric strain. The term, "flip" is misleading, because the direction of each carbon remains the same; what changes is the orientation. A conformation is a unique structural arrangement of atoms, in particular one achieved through the rotation of single bonds.[2] A conformer is a conformational isomer, a blend of the two words.

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Note added at   2 godz. (2024-10-17 11:24:57 GMT)
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Conformation cyclohexane
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L'interconversion des conformères de type chaise est appelée inversion de cycle ( ring flipping) ou inversion de chaise (chair-flipping) . Les liaisons ...

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Note added at   2 godz. (2024-10-17 11:26:31 GMT)
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inversion de configuration??


https://cdnsciencepub.com/doi/10.1139/v99-152