13C NMR spectra of cis‐cyclohexyl‐15‐crown‐5 ether in the temperature range 298–173 K have been recorded. A single degenerate conformational process, attributed to cyclohexyl ring inversion, has been detected with a barrier of ca 10.3 kcal mol‐1. Sodium ion complexation increases this barrier by ca 0.5 kcal mol−1, whereas potassium ion complexation has no measurable effect. Spin‐lattice relaxation time results also indicate more effective complexation of sodium ion than potassium ion by the macrocyclic crown ether system. Copyright

Additional Metadata
Keywords 13C NMR, cis‐Cyclohexyl‐15‐crown‐5 ether, Dynamic stereochemistry, Relaxation times, Sodium or potassium ion complexation
Persistent URL dx.doi.org/10.1002/mrc.1260250116
Journal Magnetic Resonance in Chemistry
Citation
Buchanan, G.W, Bourque, K., Diedrich, G.K., & Khan, M.Z. (1987). cis‐cyclohexyl‐15‐crown‐5 ether: Dynamic stereochemistry in solution as studied by carbon‐13 NMR techniques. Magnetic Resonance in Chemistry, 25(1), 65–68. doi:10.1002/mrc.1260250116