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Title: N-15 nmr analysis of 1,2,3-thiadiazoles
Authors: Labbe, G ×
Delbeke, P
Bastin, Lieve
Dehaen, Wim
Toppet, Suzanne #
Issue Date: Jan-1993
Publisher: Hetero corporation
Series Title: Journal of heterocyclic chemistry vol:30 issue:2 pages:301-305
Abstract: The N-15 nmr spectra of a series of 1,2,3-thiadiazoles reveal the strong influence of substituents at C-5 on the N-2 resonance. Upon methylation, the two thiadiazole nitrogen resonances are shielded, but the most dramatic shift is observed for the methylated nitrogen, DELTAdelta > 140 ppm. The N-15 chemical shifts of some mesoionic thiadiazoles were also determined and explained by the dual effect of 5-substitution and salt formation. By disconnecting these effects, the N-15 chemical shifts of 10 and 11 were found to be unusual and to reflect a thiapentalene character.
ISSN: 0022-152X
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular Design and Synthesis
× corresponding author
# (joint) last author

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