The title compounds are decarbonylated at room temperature by AgClO4 to give, in the presence of trapping agents, the corresponding formal cyclobutadiene adducts.
H. Ona, M. Sakai, M. Suda and S. Masamune, J. Chem. Soc., Chem. Commun., 1973, 45 DOI: 10.1039/C39730000045
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