Treatment of 1,6-diyn-3-ene system 1 with SeO2 caused a Myers type cyclization to produce a biradical 6 through an enyne–allene system 5 which was generated by an ene reaction of 1 with SeO2, in analogy with the case of neocarzinostatin chromophore.
K. Toshima, K. Ohta, T. Ohtake and K. Tatsuta, J. Chem. Soc., Chem. Commun., 1991, 694 DOI: 10.1039/C39910000694
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