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Inducing Complete Polyp Regeneration from the Aboral Physa of the Starlet Sea Anemone Nematostella vectensis

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Pyramidanes.

Vladimir Ya Lee¹, Yuki Ito, Akira Sekiguchi

¹Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan. leevya@chem.tsukuba.ac.jp

Journal of the American Chemical Society

|May 31, 2013

Summary

Chemists synthesized the first stable pyramidane derivatives, germa- and stannapyramidanes. These highly strained polyhedral compounds exhibit unique bonding and structural characteristics, verified by experimental and computational methods.

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Area of Science:

Organometallic Chemistry
Polyhedral Chemistry
Synthetic Chemistry

Background:

Pyramidane structures are theoretically studied but synthetically elusive.
Nonclassical bonding and strained polyhedral frameworks are of significant interest.
Previous attempts to synthesize pyramidanes or their heavier group 14 element derivatives have been unsuccessful.

Purpose of the Study:

To synthesize and structurally characterize the first stable pyramidane derivatives.
To investigate the unique bonding and structural features of these novel compounds.
To explore the potential of heavier group 14 elements in forming strained polyhedral structures.

Main Methods:

Multi-step synthesis of germa- and stannapyramidanes.
Single-crystal X-ray diffraction for structural elucidation.
Density functional theory (DFT) calculations for electronic structure analysis.

Main Results:

Successful synthesis and isolation of germa- and stannapyramidanes with bulky trimethylsilyl substituents.
Experimental and computational data confirm nonclassical, neutral structures with significant ionic character.
Detailed structural analysis reveals peculiar bonding features within the strained polyhedral framework.

Conclusions:

The first stable pyramidane derivatives, germa- and stannapyramidanes, have been synthesized.
These compounds represent a significant advancement in the chemistry of strained polyhedral molecules.
The findings open new avenues for exploring novel bonding modes and structures in organometallic chemistry.