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Report | Regular issue | Vol 6, No. 11, 1977, pp.1881-1887
Published online, 1st January, 1970
DOI: 10.3987/R-1977-11-1881
Proton Magnetic Resonance Spectra of Some Alkylpyridine and Alkylpyrazine N-Oxides

Akihiro Ohta,* Yasuo Akita, and Chiseko Takagi

*Tokyo University of Pharmacy and Life Science, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan


In the PMR spectra of some 2-alkylpyridine 1-oxides and 2,5-dialkylpyrazine 1-oxides, except α-picoline 1-oxide and 2,5-dimethylpyrazine 1-oxide, the signals of the α-protons of the side chain at C-2 appeared in a lower field than those of the parent amines. It is concluded that this shift to the lower field is caused by the anisotropic effect of the N-O group.