Term: tub conformation
https://doi.org/10.1351/goldbook.T06528

Definition:
A conformation (of symmetry group D2d) of an eight-membered ring in which the four atoms forming one pair of diametrically opposite bonds in the ring lie in one plane and all other ring atoms lie to one side of that plane. It is analogous to the boat conformation of cyclohexane. T06528.png

Related Terms:
1) crown conformation (http://doi.org/10.1351/goldbook.C01422).
2) conformation (http://doi.org/10.1351/goldbook.C01258).
3) boat (http://doi.org/10.1351/goldbook.B00689).

Image: Not defined (https://goldbook.iupac.org/img/inline/T06528.png) 

Source: PAC, 1996, 68, 2193. 'Basic terminology of stereochemistry (IUPAC Recommendations 1996)' on page 2221 (https://doi.org/10.1351/pac199668122193)

Citation: 'tub conformation' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.T06528

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