## Abstract ^13^C and ^15^N NMR data for twelve __N__‐unsubstituted pyrrolidines are reported and __cis__ and __trans__ stereomers are assigned for 2,3‐, 2,4‐ and 2,5‐disubstituted compounds.
13C NMR study of N-unsubstituted aziridines: I—steric effects, pseudoconjugation
✍ Scribed by P. Mison; R. Chaabouni; Y. Diab; R. Martino; A. Lopez; A. Lattes; F. W. Wehrli; T. Wirthlin
- Publisher
- John Wiley and Sons
- Year
- 1976
- Tongue
- English
- Weight
- 717 KB
- Volume
- 8
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
^13^C chemical shifts for twenty‐nine alkyl and phenyl substituted N‐unsubstituted aziridines have been measured. Additivity parameters for methyl, phenyl and aziridyl carbons have been derived with the aim of testing the consistency of the assignments made on the basis of chemical shift considerations and off‐resonance decoupling information. The observed chemical shifts are discussed in terms of steric and pseudoconjugation effects.
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## Abstract Conformations of aliphatic diastereoisomers with vicinal asymmetric centers (2,3‐disubstituted butanes and 5,6‐disubstituted __n__‐decanes) are discussed in terms of their ^13^C and, in some cases, ^15^N chemical shifts and spin‐lattice relaxation times. Solvent and protonation effects
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