9‐Fluor‐9‐borabicyclo[3.3.1]nonan ‐ Charakterisierung in Lösung und im Kristall

9‐Fluoro‐9‐borabicyclo[3.3.l]nonane — Characterization in Solution and in the Solid State 9‐Fluoro‐9‐borabicyclo[3.3.1]nonane ( 1 ), prepared from bis(9‐borabicyclo[3.3.1]nonane) with SbF 3 or SbF 5 in high yields, is characterized by IR, mass, and multi‐NMR spectroscopy. Pure 1 in solution has a small 11 B‐NMR singlet signal in contrast to the freshly prepared 1 with the normal J PB ‐split 11 B resonance. The X‐ray structure analysis of 1 with three differently bonded molecules I–III (Abb. 2) in the cell shows a monomer and a dimer of 1 with DFB coordination bond. – Some Lewis base adducts of 1 are prepared, the others were characterized by 11 B‐NMR spectra.