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^(15)N NMR spectroscopy of some azines

Stefaniak, L. and Roberts, John D. and Witanowski, M. and Webb, G. A. (1984) ^(15)N NMR spectroscopy of some azines. Organic Magnetic Resonance, 22 (4). pp. 201-208. ISSN 0030-4921. doi:10.1002/mrc.1270220402.

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^(15)N NMR shielding data are presented for 56 cyclic azines in 0.5 M dimethyl sulfoxide solutions with 0.01 M increments of Cr(acac)_3 added for each nitrogen atom in the molecules. For the polyazines, the ^(15)N signal assignments were based on ^2J(NH) interactions and some INDO/S-SOS shielding calculations. The effects of α-, β- and γ-methyl and conjugated ring substitution on nitrogen shielding are presented and discussed, as are the influences arising from fusion with alicyclic and aromatic rings at various positions. The effects of a second nitrogen atom on the shielding of the first one are shown to be critically dependent on both their relative positions and on the position of fusion of conjugated ring systems.

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Additional Information:© 1984 Wiley Heyden Ltd. Received 21 April 1983; accepted 15 August 1983. The part of this research carried out at the California Institute of Technology was supported by the National Science Foundation, and by the Public Health Service, Research Grant No. GM 11072 from the Division of General Medical Sciences. Thanks are due to Ms B. T. Hamdi for assistance with INDO/S-SOS shielding calculations, which were performed using the CDC 7600 installations at the Universities of London and Manchester with the aid of a modified version of QCPE174.
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U.S. Public Health ServiceGM 11072
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Caltech Gates and Crellin Laboratories of Chemistry6809
Issue or Number:4
Record Number:CaltechAUTHORS:20151002-123938604
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Official Citation:Stefaniak, L., Roberts, J. D., Witanowski, M. and Webb, G. A. (1984), 15N NMR spectroscopy of some azines. Org. Magn. Reson., 22: 201–208. doi: 10.1002/mrc.1270220402
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:60722
Deposited By: Ruth Sustaita
Deposited On:02 Oct 2015 22:26
Last Modified:10 Nov 2021 22:38

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