Compounds with Planar Tetracoordinate Boron Atoms: Anti van't Hoff/Le Bel Geometries without Metal Centers

Matthias Menzel, Dirk Steiner, Heinz‐Jürgen ‐J Winkler, Dieter Schweikart, Sigrid Mehle, Stefan Fau, Gernot Frenking, Werner Massa, Armin Berndt