A metamorphosis of the tetraethynyl precursor 1 through double Cu-catalyzed ring closure leads to the corresponding butterfly-shaped cyclobutadiene complexes 2 in high yield (94 %). Single-crystal X-ray diffraction shows that the large organic ligand is distinctly nonplanar with a concave topology. Cp=cyclopentadiene.
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| http://dx.doi.org/10.1002/1521-3773(20010417)40:8<1460::AID-ANIE1460>3.0.CO;2-Q | DOI Listing |
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