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NMR-spektroskopische Untersuchungen an Derivaten des 2,4-Dichlorphenoxyessigsaeurehydrazids
Himmelreich, U.,Tschwatschal, F.,Borsdorf, R.
, p. 1041 - 1052 (1993)
Derivatives of 2,4-dichlorophenoxyacetyl-hydrazides were prepared by reaction of the hydrazides with different aldehydes.NMR-spectroscopic investigations of these compounds show the existence of rotamers resulting from a nitrogen-carbonyl bond rotation.Contrary to substituted dithiocarbacinic acid derivatives no E/Z-isomerism relative to the C=N double bond could be demonstrated.In order to prove the structures we utilized chemical shift differences in the 1H-, 13C- and 15N-NMR-spectra, NH and CH coupling constants and NOE-difference measurements.The barriers of rotation were determined by NMR-measurements at various temperatures and line shape analysis using the computer program D-NMR 3. - Keywords. 2,4-Dichlorophenoxyacetyl-hydrazides; NMR-spectroscopy; Rotational isomers.
