期刊
TETRAHEDRON LETTERS
卷 50, 期 35, 页码 5018-5020出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2009.06.081
关键词
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资金
- National Institutes of Health [5 S06 GM52588]
- National Science Foundation [DUE-9451624, DBI 0521342]
Substituents on the pyridinium ring of N-methylpyridinium derivatives, especially those on the 2- or 4-position, have a large effect on the H-1 and C-13 NMR chemical shifts of the N-methyl group. Reasonable correlations between the chemical shift changes and the resonance substituent constants are observed. The dual substituent parameter approach provides an excellent correlation when a combination of polar and resonance substituent constants is employed. (C) 2009 Elsevier Ltd. All rights reserved.
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