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Dianions of Tetraboranes(4): Puckered Aromatic Four-Membered Rings and Their Reactions with Conservation of Aromaticity


  • This work was supported by the Deutsche Forschungsgemeinschaft and the Fonds der Chemischen Industrie.


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Aromatic with boron: Two-electron heteroaromatic compounds 1 and 2 undergo oxidations and reactions with electrophiles (reducing the number of framework electrons by two and four, respectively) under conservation of aromaticity. In contrast, corresponding reactions of the known dianion 3, a six-electron aromatic four-membered ring, lead to loss of aromaticity (R=SiMe3).