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Tetrasilyl-substituted cyclobutadiene dianion dilithium salt: synthesis and structure

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Abstract

The reaction of tetrakis(trimethylsilyl)cyclobutadienylcyclopentadienyl cobalt complex (Me3Si)4C4CoCp with lithium metal in THF yielded the dilithium salt of cyclobutadiene dianion CBD2– stabilized by four trimethylsilyl groups, Li+ 2[(Me3Si)4C4]2–. The bridged CBD2– dianion was also synthesized by a similar procedure starting from the bridged cobalt complex, which was prepared from the reaction of 2,2,5,5,8,8,11,11-octamethyl-2,5,8,11-tetrasilacyclododeca-1,6-diyne with CpCo(CO)2 in refluxing octane. The aromaticity of the CBD2– is discussed on the basis of the structural characteristics and magnetic properties.

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Authors and Affiliations

  1. Department of Chemistry, University of Tsukuba, Tsukuba, Ibaraki, 305 8571, Japan

    A. Sekiguchi, M. Tanaka, H. Watanabe & M. Nakamoto

  2. Coordination Chemistry Laboratories, Institute for Molecular Science, Okazaki, Aichi, 444 8585, Japan

    T. Matsuo

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  1. A. Sekiguchi
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  3. M. Tanaka
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  4. H. Watanabe
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  5. M. Nakamoto
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Sekiguchi, A., Matsuo, T., Tanaka, M. et al. Tetrasilyl-substituted cyclobutadiene dianion dilithium salt: synthesis and structure. Russian Chemical Bulletin 53, 1109–1115 (2004). https://doi.org/10.1023/B:RUCB.0000041308.25889.77

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