Abstract

We report the basis for the presence of two molecular dynamic processes, in enamino spiro-ketal-type compounds (structure in Fig. 1), that occur in a 330-350 K temperature range. Nuclear magnetic resonance (NMR) is a powerful tool for investigating such molecular dynamic processes in small and large molecules. This capability is a result of the pronounced influence of dynamic effects on NMR spectra. Analysis of experimental NMR data suggests that one of the two molecular processes is <i>cis-trans</i> isomerization across nineteen chemical bonds. <i>To the best of our knowledge, this is the first example of monitoring</i> cis-trans <i>isomerization involving this many chemical bonds by NMR.</i>

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