The photorearrangements of the benzopyrazinobarrelenes 1–4 to give benzopyrazinosemibullvalenes have been studied in order to examine the competing aptitude of benzene and pyrazine intramolecularly.
C. Liao and P. Yang, J. Chem. Soc., Chem. Commun., 1991, 626 DOI: 10.1039/C39910000626
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