1.4- Diethylpyrazine radical cation

Pyrazine (367) was converted into 1,4-diethylpyrazinediium bis(tetrafluorobo-rate) (368), the 1,4-diethylpyrazine radical cation iodide (369, X = I) (electrolytic reduction Nal J,), and finally the corresponding tetraphenylborate (369, X = BPh4) (NaBPh4 18%) which was sufficiently stable for elemental and X-ray analysis.548... 

Figure 5. ESR spectra of the reaction mixture of ethylamine with glucose (lower) and of synthesized N,N -diethylpyrazine cation radical (upper). (Reproduced from Ref. 3. Copyright 1977, American Chemical Society.)...

As described above, the free radical products are considered as N,N -disubstituted pyrazine cation radical products. However, formation of such pyrazine derivatives in the Maillard reaction is unknown, and little work has been done on the synthesis of N.N -diethylpyrazinium salt (8), the one—electron oxidation product of the N, N -diethylpyrazine cation radical. The... 

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