Die Dissertation befasst sich mit der Darstellung von Iminoboranen sowie deren Verwendung bei der Rhodium-vermittelten Synthese von Azaborininen. / The first examples of adducts of cyclic alkyl(amino) carbenes (cAACs) and N-heterocyclic carbenes (NHCs) with iminoboranes have been synthesized and fully characterized. Furthermore new synthetic route to functionalized 1,2 and 1,4-azaborinines has been developed utilizing a [2+2]/[2+4] cycloaddition reaction of di-tert-butyliminoborane and the unsymmetric (tert-butylimino)mesityborane with a series of alkynes in presence of the rhodium complex [{RhCl(PiPr3)2}]2.