Oligomeric pentafluorophenylboron azides

Abstract
The dichloroborane C6F5BCl2 reacted with two equivalents trimethylsilyl azide to form C6F5B(N3)2 which trimerizes in the solid state to give [C6F5B(N3)2]31, the first example of an azido substituted N,N,N′′-tris(diazo)triazatriboratacyclohexane. Its monomer was trapped by pyridine yielding C6F5B(N3)2·py 2. This is in contrast to (BF2N3)33 which is trimeric in solution and in the solid state, as shown by 11B NMR spectroscopy.

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