By F. Scheinmann
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From Table 6 (p. 65) (see also Table 7), it is apparent that of the various ring-protons in (XXI) and (XXII) only the 6-proton in (XXI) could have such a high chemical shift. So structure (XXI) represents the nitration product. The further analysis of the spectrum (Fig. 8) confirms the conclusion. (6) The magnitude of proton-proton couplings across double bonds depends upon the stereochemistry. Typical values are 15-17 Hz for J (trans) and 12-14 Hz for J(cis). Cis- and ircws-isomers of olefinic compounds can therefore be characterized readily by proton magnetic resonance spectroscopy.
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