Tetraanion Tetralithium with 8 Center/12 Electron <i>π</i>-System Stabilized by Silyl Groups. Synthesis and Characterization

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  • Akira Sekiguchi
    Department of Chemistry, University of TsukubaTsukuba, Ibaraki 305
  • Tsukasa Matsuo
    Department of Chemistry, University of TsukubaTsukuba, Ibaraki 305
  • Ryoichi Akaba
    Department of Chemistry and Advanced Engineering Course of Gunma Kohsen, Gunma National College of Technology580 Toriba-machi, Maebashi, Gunma 371

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<jats:title>Abstract</jats:title> <jats:p>Reduction of octasilyltrimethylenecyclopentene (2) with lithium metal in tetrahydrofuran yields orange crystals of the tetraanion tetralithium (3) with 8 center/12 electron π-system. The molecular structure of 3 is unequivocally established by X-ray crystallography. The tetralithium 3 has a monomeric structure and forms contact ion pairs (CIP) in the crystals. The two lithium atoms (η5) are located above and below the center of the five-membered ring, whereas the other two lithium atoms (μ2) are bonded to the two exocyclic carbon atoms. The structural parameters of 3 are discussed in comparison to that of the neutral starting molecule of 2. The structure of 3 in solution has also been discussed on the basis of NMR spectroscopic data.</jats:p>

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