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Diels-Alder Additions as Mechanistic Probes-Interception of Silyl-Isoindenes: Organometallic Derivatives of Polyphenylated Cycloheptatrienes and Related Seven-Membered Rings

Journal

MOLECULES
Volume 25, Issue 20, Pages -

Publisher

MDPI
DOI: 10.3390/molecules25204730

Keywords

isoindenes; tetracyanoethylene; ferrocenylhexaphenylcycloheptatriene; tropylium ions; hexanaphthylbenzene; X-ray crystallography; organometallic molecular brake

Funding

  1. Natural Sciences and Engineering Research Council of Canada (NSERC)
  2. Petroleum Research Fund (PRF)
  3. Science Foundation Ireland (SFI)

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The intermediacy of short-lived isoindenes, generated in the course of metallotropic or silatropic shifts over the indene skeleton, can be shown by Diels-Alder trapping with tetracyanoethylene, leading to the complete elucidation of the dynamic behaviour of a series of polyindenylsilanes. Cyclopentadienones, bearing ferrocenyl and multiple phenyl or naphthyl substituents undergo [4 + 2] cycloadditions with diaryl acetylenes or triphenylcyclopropene to form the corresponding polyarylbenzenes or cycloheptatrienes. The heptaphenyltropylium cation, [C7Ph7+], was shown to adopt a nonplanar shallow boat conformation. In contrast, the attempted Diels-Alder reaction of tetracyclone and phenethynylfluorene yielded electroluminescent tetracenes. Finally, benzyne addition to 9-(2-indenyl)anthracene, and subsequent incorporation of a range of organometallic fragments, led to development of an organometallic molecular brake.

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