Reductive elimination of α-alkynyl substituted zirconacyclopentenes, prepared from diaryldiynes and Cp2ZrEt2, proceeded upon heating or in the presence of dimethyl acetylenedicarboxylate to give alkynylcyclobutene derivatives.
Y. Liu, W. Sun, T. Takahashi, W. Sun and K. Nakajima, Chem. Commun., 1998, 1133 DOI: 10.1039/A801163J
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