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- W2324494868 abstract "The coupling constants arising from benzylic coupling between ring-Me protons and ortho-, meta-, and para-situated ring protons for methylpyrazine and for a number of chloro-and methoxyl-substituted pyrazines were found to have the magnitudes 4jo = 0·55 – 0·66 Hz; 5Jm 0·28 – 0·34 Hz; 6Jp = 0·65 – 0·74 Hz. The signs were found by selective decoupling experiments to be negative, positive and negative respectively. On the basis of the Me replacement technique, within its inherent limitations, the para-benzylic coupling appears to be π-electron transmitted, whereas a σ-electron contribution of ∼ 30% appears likely for the meta-benzylic coupling." @default.
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- W2324494868 title "The nuclear magnetic resonance spectra of pyrazines" @default.
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