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DOI: 10.1055/s-2006-950280
Doubly Charged Four-Membered Ring Systems: Cyclobutadiene Dianions and Heavy Cyclobutadiene Dianions
Publication History
Publication Date:
09 October 2006 (online)
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Abstract
Recent progress in the experimental chemistry of cyclobutadiene dianions (CBD2-s) containing a doubly charged four-membered ring system is reviewed. New families of silyl-substituted CBD2-s, cyclobutadienes (CBDs), and tetrahedranes are covered in detail. The aromaticity of the tetrasilyl- and diphenyldisilyl-CBD2-s have been studied on the basis of structural characteristics and magnetic properties. All of the CBD2-s show a strong diatropic ring current resulting from six π-electron system. The preparation of CBD2- derivatives consisting of heavier group 14 elements (Si and Ge) is also included. They demonstrate a non-aromatic nature with a folded four-membered ring.
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1 Introduction
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2 Cyclobutadiene Dianions (CBD2-s)
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2.1 Preparation of CBD Complexes
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2.2 Transmetalation of CBD Complexes
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2.3 Tetrasilyl-CBD2-s
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2.4 Diphenyl-Disilyl-CBD2-s
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3 Cyclobutadienes (CBDs)
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4 Tetrahedranes
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5 Heavy Cyclobutadiene Dianions (CBD2-s)
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6 Conclusion
Key words
silicon - small-ring systems - cyclobutadiene dianions - cyclobutadienes - tetrahedranes - aromaticity - cage compounds - germanium
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36Tanaka, M.; Sekiguchi, A. unpublished results.