Radial (tetracyclopentadienyl)cyclobutadiene pentametals

Radial (tetracyclopentadienyl)cyclobutadiene pentametals have been synthesized by the Pd-catalyzed coupling of cyclopentadienyltin or of (CpM)zinc reagents with (tetraiodocyclobutadiene)iron(tricabonyl). X-ray structural and NMR data reveal that, while these arrays are crowded, the substituents enjo...

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Bibliographic Details
Published in:Inorganica Chimica Acta 2011-04, Vol.369 (1), p.32-39
Main Authors: Eichberg, Michael J., Kayser, Bernd, Leonard, Philip W., Miljanić, Ognjen Š., Timofeeva, Tatiana V., Vollhardt, K. Peter C., Whitener, Glenn D., Yakovenko, Andrey, Yu, Yong
Format: Article
Language:English
Subjects:
Cyclobutadiene complexes
Cyclopentadienyl complexes
Pd-catalyzed coupling
Radial pentanuclear metal complexes
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Summary:Radial (tetracyclopentadienyl)cyclobutadiene pentametals have been synthesized by the Pd-catalyzed coupling of cyclopentadienyltin or of (CpM)zinc reagents with (tetraiodocyclobutadiene)iron(tricabonyl). X-ray structural and NMR data reveal that, while these arrays are crowded, the substituents enjoy considerable rotational freedom. The method constitutes a significant complement to currently existing strategies for the construction of persubstituted cyclobutadiene complexes. [Display omitted] ► Pd-catalyzes the four-fold coupling of cyclopentadienyl metals with (tetraiodocyclobutadiene)iron(tricabonyl). ► Radial tetracyclopentadienyl)cyclobutadiene pentametals represent crowded arrays. ► Despite steric crowding, the substituents in radial (tetracyclopentadienyl)cyclobutadiene pentametals enjoy considerable rotational freedom. Radial (tetracyclopentadienyl)cyclobutadiene pentametals have been synthesized by the Pd-catalyzed coupling of cyclopentadienyltin or of (CpM)zinc reagents with (tetraiodocyclobutadiene)iron(tricabonyl). X-ray structural and NMR data reveal that, while these arrays are crowded, the substituents enjoy considerable rotational freedom. The method constitutes a significant complement to currently existing strategies for the construction of persubstituted cyclobutadiene complexes.
ISSN:0020-1693
1873-3255
DOI:10.1016/j.ica.2010.10.004