Irradiation of pyrazinobarrelene (1) resulted in di-π-methane rearrangement via vinyl–vinyl and pyrazino-vinyl bridges, in the ratio 47 : 53, while irradiation of dicyanopyrazinobarrelenes (2) and (3) afforded only the pyrazino–vinyl bridged products.
C. Liao, H. Hsieh and S. Lin, J. Chem. Soc., Chem. Commun., 1990, 545 DOI: 10.1039/C39900000545
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