Eighteen compounds unknown in the literature, N‐(E)‐stilbenyloxyalkylcarbonyl‐ and N‐(E)‐stilbenyloxyalkylcarbonylaminoalkylcarbonyl‐substituted hydrazones of 2‐, 3‐ and 4‐pyridinecarboxaldehydes have been prepared. The stereochemical behavior of these compounds in dimethyl‐d6 sulfoxide solution has been studied by 1H‐nmr technique. The E geometrical isomers and cisltrans amide conformers have been found for N‐substituted‐hydrazones 1–16.

Eighteen new N-(E)-stilbenyloxyalkylcarbonyl-substituted hydrazones ofortho- (meta- andpara-) chloro- (nitro-) benzaldehydes1–18and two analogous hydrazones of acetone19-20were prepared. The stereochemical behavior of1–18in dimethyl-d6sulfoxide solution has been studied by NMR and NMR techniques, using spectral data of19and20as supporting material. The E-geometrical isomers and cis-/trans-amide conformers have been found for these hydrazones. Energy barriers of isomers are reported.

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