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Effect of substituents on the 13 C chemical shifts of the azomethine carbon atom of N-(phenyl substituted) pyridine-4-aldimines

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1999
Authors
Jovanović, Bratislav Ž.
Mišić-Vuković, Milica M.
Marinković, Aleksandar D.
Vajs, Vlatka
Article (Published version)
,
Elsevier
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Abstract
13 C chemical shifts of the azomethine carbon atom for N-(substituted phenyl)pyridine-4-aldimines, 4-Py-CH=N-C 6 H 4 -X, X having a wide range of substituent effects, have been determined in CDCl 3 solution. Exceptionally good Hammett correlations of 13 C NMR chemical shifts of azomethine carbons with electrophilic substituent constants σ + points out to a strong resonance interaction of substituents on the aniline ring with the azomethine carbon atom of the investigated imines. The increased demand for elections in the investigated system is being compared with that of the N- benzylidenaniline. The mode of transmission of substituent effects, both inductive and resonance, both systems, is discussed.
Keywords:
13C NMR spectroscopy / Spectra–structure correlations / N-(substituted phenyl) pyridine-4-aldimines
Source:
Journal of Molecular Structure, 1999, 482-483, 375-378
Publisher:
  • Elsevier

DOI: 10.1016/S0022-2860(98)00860-6

ISSN: 0022-2860

Scopus: 2-s2.0-0344171895
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13
URI
http://cer.ihtm.bg.ac.rs/handle/123456789/2813
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