NMR-spektroskopische Untersuchungen zurE/Z-Isomerie von substituierten Dithiocarbazinsäurederivaten |
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Authors: | Uwe Himmelreich Reiner Häßner Philip Thomas Frank Tschwatschal Rolf Borsdorf |
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Institution: | (1) Sektion Chemie, Karl-Marx-Universität Leipzig, D-O-7010 Leipzig, Bundesrepublik Deutschland |
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Abstract: | Summary NMR-spectroscopic investigations of substituted dithiocarbacinic acid derivatives show the existence of configurational isomers relative to the C=N double bond, but no tautomerism. We applied chemical shift differences in the1H-,13C- and15N-NMR-spectra, N - H and C - H coupling constants and NOE difference measurements in the solvents CDCl3,DMSO-d
6 and partly CD3OD in order to discriminate between the isomers and to determine the configurational composition. Compounds4 and5 exist asE-isomers in all solvents, compounds1, 2 and3 as a mixture ofE/Z-isomers. InDMSO-d
6 theE-form is the preferred isomer. |
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Keywords: | Dithiocarbacinic acid E/Z-Isomerism NMR-Spectroscopy NOE-Difference measurements |
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