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Carbon-13 NMR studies of 1-aryl-3-phenyl-2-thioxo-4-imidazolidinones. Conformational isomerism and substituent effects

✍ Scribed by Lawrence D. Colebrook; Mohammad A. Khadim

Publisher
John Wiley and Sons
Year
1982
Tongue
English
Weight
401 KB
Volume
19
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

Characteristic ^13C^ chemical shift ranges and substituent shifts of heterocyclic ring carbon atoms have been identified for a number of 1‐aryl‐3‐phenyl‐2‐thioxo‐4‐imidazolidinones. ^13^CNMR spectra may be used to detect slow internal rotation about the aryl CN‐1 bond in compounds with diastereomeric rotational isomers; many corresponding carbon atoms in the rotamers have distinctly different chemical shifts. The δ‐effects originating from aryl ortho substituents are both electronic and steric in origin.

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