The electronic absorption and c.d. spectra of a number of alkyl-substituted pyrazines in neutral and in acidic solvents have been measured, and for the optically active compounds the observed Cotton effects have been assigned to the respective n→π* and π→π* transitions of the pyrazine chromophore.
H. E. Smith and A. A. Hicks, J. Chem. Soc. D, 1970, 1112 DOI: 10.1039/C29700001112
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