Synthesis of polyheterocyclic 1, 1-diboryltriazenes by γ-nitrogen insertion of azides into activated B–B single bonds. Issue 42 (22nd April 2020) - Prieschl, Dominic
Abstract : The γ-nitrogen insertion of arylazides into the B–B bond of electron-rich cyclic μ-hydridodiboranes yields unsymmetrical polyheterocyclic 1, 1-diboryltriazenes, which may undergo further NHC ring expansion/fusion and thermally induced loss of N2 . Abstract : The γ-nitrogen insertion of arylazides into the B–B bond of electron-rich cyclic μ-hydridodiboranes stabilised by one N-heterocyclic carbene (NHC) ligand leads to the expansion of the central C3 B2 ring, yielding unsymmetrical polyheterocyclic 1, 1-diboryltriazenes. The 2-benzyl-bridged analogues undergo further NHC ring expansion and thermally induced loss of N2 .