Abstract
The reaction of tetra(o-tolyl)diborane(4) with organic azides afforded three different compounds, diborylamines, diboryltriazenes, and B2 -hexazenes having a bicyclic B2 N6 ring system. The reaction with aryl azides gave diborylamines, while the reaction with 1 equiv. of alkyl azides furnished diboryltriazenes. In the case of the reaction with an excess amount of primary alkyl azide, a new heterocyclic B2 -hexazenes were obtained. The formation of the B2 N6 structure could be explained by one general reaction mechanism via the diboryltriazene intermediate according to the control experiments and DFT calculations. The B2 -hexazenes exhibited a strong fluorescence with a remarkably high fluorescent quantum yield of up to 96 %.
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