Beiträge zur Chemie der Pyrrolpigmente, 3. Mitt.1: Die NH-Tautomerie von substituierten Pyrromethenen: Protonenresonanzspektrometrische Untersuchungen |
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| Authors: | Doz. Dr. H. Falk S. Gergely O. Hofer |
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| Affiliation: | (1) Lehrkanzel für Organische Chemie der Universität Wien, Währinger Straße 38, A-1090 Wien, Österreich |
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| Abstract: | NMR-spectra of several pyrromethenes were measured at different temperatures, concentrations and in different solvents. The chemical shifts of all protons were assigned and long range coupling constants determined. This variation of temperature, concentration and solvent provided evidence forintra- andinter-molecular proton transfer. In all pyrromethenes investigated the tautomeric NH exchanges are too fast—even at –100°C—to be measured by NMR.
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