Abstract
The aminoborane Ph 2BN(CMe 3SiMe 3 possesses a relatively long BN bond (1.433 Å) and a nonplanar C 2BNCSi (τ(C 2B/NCSi) 45°) skeleton as shown by X-ray structure analysis. In addition, the structure of five diborylamines have been determined by X-ray methods. The compounds (mes 2B) 2NH and (mes 2BNH) 3B belong to diborylamines with a coplanar conformation for the C 2BNHBC 2 (or C 2BNHBN 2) units, while the diborylamines (Ph 2B) 2)NH and (Ph 2B) 2NMe adopt a twist conformation. Finally, an orthogonal conformation was detected for t-Bu 2BNMe-9-borafluorene. The T-Bu 2B group stands almost perpendicular on the BNC-9-borafluorene plane. Consequently, two distinctly different BN bond lengths (1.482 and 1.392 Å) are observed. The influence of steric effects on the conformation and bonding parameters is discussed.
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