The title compounds (1, 3) were prepared by photochemical isomerisation of 2,3-dihydrofurans (2, 4) and reacted with pyridines or pyrazine to give zwitterionic products (5) which are thought to be intramolecular charge-transfer complexes.
K. Ohkata, T. Sakai, Y. Kubo and T. Hanafusa, J. Chem. Soc., Chem. Commun., 1974, 581 DOI: 10.1039/C39740000581
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