A Diamidocarbene-Supported Aminoborylene: Characterization and Discussion of the Elusive Crystal Structure

Abstract

Five years after we published the synthesis of the first diamidocarbene (DAC)-supported amino borylene 4, we now report the elusive single crystal X-ray structure. The X-ray structure of 4 was found to corroborate our previous computational studies which indicated that the borylene adopted a heterocumulenic geometry with a near linear C_(carbene) = B = N unit (175.88(18)^◦) as well as short C = B and B = N distances of 1.416(3) and 1.344(3) Å, respectively. Additionally, we further provide a qualitative and quantitative discourse on said structure with respect to the precursor compounds used to prepare 4 as well as to the known cyclic (alkyl) amino carbene (CAAC) analog 2.