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The NMR spectra of 2,3‐ and 2,3,8,9‐substituted pyrazino [2,3‐f] quinoxalines are described. Unambiguous deuteriation of 5,6‐diaminoquinoxalines allowed the assignment of the 7‐ and β‐protons; changes in solvent induce inversions in the peak positions.
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Nasielski‐Hinkens et al. (1976) studied this question.
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