A simple and versatile procedure was developed for the synthesis of pyrazino[2,3-b]thieno[3,4-e]pyrazine derivatives with intramolecular charge transfer character. The compounds obtained exhibited a narrower band gap compared to those with one pyrazine bridge.
L. Zhang, K. C. Lo and W. K. Chan, Chem. Commun., 2014, 50, 4245 DOI: 10.1039/C4CC01084A
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