IR- und NMR-spektroskopische Untersuchungen an Rubazonsäuren.
Open Access
- 1 August 1976
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung B
- Vol. 31 (8) , 1106-1115
- https://doi.org/10.1515/znb-1976-0822
Abstract
The IR and NMR spectra of rubazonic acids 1 and 2 show that these compounds form only OH tautomers in nonpolar solvents and in the crystalline state. They are stabilized by a strong intramolecular hydrogen bond in an eight-membered ring. The IR and NMR spectra show that they exhibit a symmetrical structure. The hydrogen bond has a double minimum potential. Alteration of the symmetry of substitution in 1- and 1′-positions markedly influences the signal of the OH proton. This symmetry effect is discussed.Keywords
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