Transformation of the benzoquinoxalinobicyclo[2,2,2]octatriene (2) into the benzoquinoxalinotricyclo[3,3,0,02,8]octadiene (3) was brought about by direct photolysis and attributed to a highly specific di-π-methane rearrangement.
K. G. Srinivasan and J. H. Boyer, J. Chem. Soc., Chem. Commun., 1974, 1026 DOI: 10.1039/C39740001026
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