1-Zircona-4-halobuta-1,3-diene derivatives react in the presence of CuCl to produce cyclobutadiene derivatives which afford their dimers, or Diels–Alder adducts with dimethyl maleate or fumarate.
H. Ubayama, W. Sun, T. Takahashi and Z. Xi, Chem. Commun., 1998, 1931 DOI: 10.1039/A805136D
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