Abstract
Preferred conformations of some azaspiran systems substituted with large groups at the nitrogen atoms were established by UV absorption spectroscopy. These groups prohibit the inversion at nitrogen, as was deduced from the1H NMR spectra.
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Smoliński, S., Kubaszek, M. Synthese und Konformation einiger Azaspirane mit Alkyl-bzw. Aryl-Sulfonamid-Gruppen. Monatsh Chem 115, 79–86 (1984). https://doi.org/10.1007/BF00798423
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DOI: https://doi.org/10.1007/BF00798423