Angewandte Chemie - International Edition p. 1460 - 1463 (2001)
Update date:2022-08-05
Topics:
Laskoski, Matthew
Roidl, Gaby
Smith, Mark D.
Bunz, Uwe H. F.
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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Doi:10.1016/S0040-4020(01)00070-9
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