envelope conformation

https://doi.org/10.1351/goldbook.E02152
The @[email protected] (of symmetry group \(C_{\text{s}}\)) of a five-membered ring in which four atoms are coplanar, and one atom (the flap) projects out of the plane.
E02152.png
Source:
PAC, 1996, 68, 2193. (Basic terminology of stereochemistry (IUPAC Recommendations 1996)) on page 2208 [Terms] [Paper]
Cite as: IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). Online version (2019-) created by S. J. Chalk. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook.
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Last revised: February 24, 2014