'A' value

also contains definition of: Winstein–Holness A value
https://doi.org/10.1351/goldbook.A00012
The conformational preference of an equatorial compared to an axial substituent in a monosubstituted cyclohexane. This steric substituent parameter equals ΔrG⚬ in kcalmol−1 for the equatorial to axial equilibration on cyclohexane. The values are also known as 'Winstein–Holness' A values.
Source:
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1087 [Terms] [Paper]
Citation: ''A' value' 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.A00012 RIS BibTex EndNote
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