A Straightforward\nSynthetic Route to Monocyclic 1,3,2,4-Diazadiborinines

A novel straightforward synthetic\nroute to monocyclic\n1,3,2,4-diazadiborinines\nhas been developed by the sequential reaction of the NHC-coordinated\niminoborane with bases and haloboranes (or borate). The first examples\nof monocyclic 1,3,2,4-diazadiborinines featuring different functional\ngroups on the two B atoms have been synthesized and structurally characterized.\nFurther derivatization of 4-bromophenyl-substituted 1,3,2,4-diazadiborinine\nhas also been achieved, giving the biphenyl-substituted 1,3,2,4-diazadiborinine.\nThe aromaticity of these newly synthesized 1,3,2,4-diazadiborinines\nwas also studied by theoretical calculations.