Abstract
The dipole moments of three symmetrically and one, unsymmetrically substituted pyrromethene derivatives were determined using cyclohexane as solvent. By comparison of these moments with those obtained from a semiempirical quantum mechanical treatment including all valence electrons (CNDO/2), the predominance of one tautomeric form of the unsymmetrically substituted species was deduced.
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5. Mitt.:H. Falk, S. Gergely undO. Hofer, Mh. Chem.105, 1004 (1974).
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Falk, H., Gergely, S. & Hofer, O. Beiträge zur Chemie der Pyrrolpigmente, 6. Mitt.: Dipolmomente von substituierten Pyrromethenen. Monatshefte für Chemie 105, 1019–1024 (1974). https://doi.org/10.1007/BF00910268
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DOI: https://doi.org/10.1007/BF00910268