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N.M.R. Studies on Aminated Dinitrobenzofuroxan and Dinitrobenzofurazan Derivatives

✍ Scribed by Dr. E. Gründemann; Prof. Dr. H.-J. Niclas; B. Göhrmann

Book ID
105353777
Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
413 KB
Volume
332
Category
Article
ISSN
1615-4150

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✦ Synopsis

Abstract

The ^13^C‐n.m.r. chemical shifts of σ‐NC‐bonded Meisenheimer complexes 3, 5 and their corresponding aminated dinitrobenzofurazans 4 and dinitrobenzofuroxans 6 were determined. The chemical shifts are discussed as a function of electronic substituent effects.

The assignment was performed by means of ^1^H^13^C coupling constants and by comparison with che ^13^C‐chemical shifts of appropriate model compounds. The ^13^C‐n.m.r. spectra of Meisenheimer tomplexes 3 reveal doubling of signals, indicating a hindered rotation at the NCHO bond.

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