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Conformational equilibria in the solid state: Conformational equilibrium in bicyclo[3.3.1]nonane derivatives studied by solid-state spectroscopy

✍ Scribed by Frank G. Riddell; Martin Rogerson

Publisher
John Wiley and Sons
Year
1992
Tongue
English
Weight
383 KB
Volume
30
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

Several derivatives of bicyclo [3.3.1]nonan‐9‐one were examined by CP/MAS NMR spectroscopy in the solid state. Contrary to an earlier report based on X‐ray crystallography, no conclusive evidence was found for the existence of a chair/chair‐chair/boat equilibrium in the temperature range −100 to +20 °C. It is concluded that if such solidstate equilibria exist they have free energies of activation for ring inversion in the solid of less than 31 kJ mol^−1^.

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