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1H- und 13C-NMR-Untersuchungen zur Struktur N-substituierter Tetrazole—Die Strukturen des N-Methoxycarbonyl-, N-Acetyl- und N-(Tri-n-butylstannyl)-tetrazols sowie Substituenteneffekte auf δ13C und 1J(CH)
Authors:Andreas Knnecke  Erich Kleinpeter
Institution:Andreas Könnecke,Erich Kleinpeter
Abstract:The 1H and 13C NMR spectra of several isomeric N-substituted tetrazoles have been investigated. 13C NMR is shown to be more useful for distinguishing between structural isomers of N-substituted tetrazoles except for those carrying electropositive substituents like SnBu3. Correlations of δC-5 (inverse) and 1J(C-5,H) with s?1 found for 1-substituted tetrazole allowed the identification of the N SnBu3 derivative as 1-(tri-n-butylstannyl)tetrazole. The phenyl carbon chemical shift difference ΔC′ = δC-3′-δC-2′ is insignificant for structure elucidation and conformational studies of N-substituted 5-phenyltetrazoles; ΔH′ from 1H NMR spectra seems to be more useful.
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