A new bicyclic oxazaborines with a bridged nitrogen atom, their thermic rearrangement and fluorescence properties

►A novel bicyclic [1,3,2λ4]oxazaborines were prepared. ►The oxazaborines rearrange to the triazaborines under various conditions. ►All the boron heterocycles were characterized by means of NMR and also by X-ray. ►Fluorescence properties were studied in various solvents and in the solid state.