Keywords: Borazines / Ring distortionThe solid-state structure of (HN=BF) 3 has been redetermined. It is characterised by a stacking of the molecules, similar to hexagonal boron nitride. In contrast, (F 3 CH 2 N=BF) 3 shows no intermolecular interactions between the planar borazine rings. In (Cl 2 BN=BCl) 3 , the Cl 2 B groups are almost perpendicularly oriented to the planar borazine ring and its B-Cl bonds are shorter than the Cl-B bonds to the ring boron atoms. Reactions of (Cl 2 BN=BCl) 3 with Me 3 SiNMe 2 allows a successive Cl/Me 2 N exchange. Depending on the molar ratio, the compounds [Cl
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