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2-(4′-Substituted) phenylisatogens: Analysis of 13C substituent chemical shifts

✍ Scribed by B. Stoddart; M. Hooper

Publisher
John Wiley and Sons
Year
1989
Tongue
English
Weight
408 KB
Volume
27
Category
Article
ISSN
0749-1581

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✦ Synopsis

The I3C NMR spectra for eight 2-(4'-substituted)phenylisatogens were determined at 30°C in CDCI, . Analysis of the ipso-carbon SCS values was carried out using the well known DSP and DSP-NLR models. Changes in the "C SCS values for the carbon atoms in the isatogen moiety suggest that a small degree of inter-ring mesomeric resonance is possible between the ring systems. A three-parameter model, which gives better overall agreement than either the DSP or DSP-NLR models, is proposed for the ipso-carbon SCS. The question of whether or not the isatogen moiety exhibits amphielectronic behaviour is still unresolved. KEY WORDS 2-(4'-Substituted)phenylisatogens 3C substituent chemical shifts Inter-ring mesomeric resonance

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