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Prevailing Z-conformations were found in N-aryl(or alkyl)substituted 2H-pyran-2-imines 4a-e on the NMR time scale. Conformational assignment was based on H and C NMR chemical shifts as well as on induced shifts by LSR. The barrier of E/Z interconversion ( ) was calculated from variable temperature ≠ ∆ Tc G H-NMR spectra.

E/Z Conformational equilibrium of N-substituted 2H-pyran-2-imines