SCHEDULED MAINTENANCE
Comparison between the photoelectron spectra of pyrazine (1), 2,6-dimethylpyrazine (2), and tetramethylpyrazine (3) indicates that in (3) the HOMO is π(b2g) while in (1) and (2) it is n+, suggesting a different behaviour towards electrophilic attack on (3) compared with (1) and (2).
P. Bischof, R. Gleiter and P. Hofmann, J. Chem. Soc., Chem. Commun., 1974, 767 DOI: 10.1039/C39740000767
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