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Aromatic Boranes with Planar-Tetracoordinate Boron Atoms and Very Short B−B Distances

Carsten Präsang, Matthias Hofmann, Gertraud Geiseler, Werner Massa, Armin Berndt

Angewandte Chemie International Edition · 2002 · 58 citations · 17 references

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Abstract

The diamond-shaped tetraborane(6) 1 and its pyridine adduct 2 are the first aromatic compounds in which two π electrons display cyclic delocalization over four and three boron centers, respectively (see scheme). The two compounds contain the shortest B−B distances ever observed. R=SiMe3, Pyr=4-tert-butylpyridine.

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