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

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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
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