Synthesis of novel b-n heterocyclic compounds and new style carbenes

Heterocycles containing boron and nitrogen are an important class of compounds owing to their wide applications in industry and academia. Among them, 1,3,2-diazaborolines have gained increasing attention because recent physicochemical studies point to possible applications, especially for organoelectronic devices.Spectacular results have been obtained in the organic chemistry using new types of ligand for transition metal catalysis. These achievements have been made possible because of the synthesis of new and stable complexes.In this study, boron and nitrogen based heterocycles as well as their derivatives are synthesized. In additionally, bidentate and tridentate ligand precursors are synthesized for metal complexes of containing bent allene-carbene ligand systems. Because of the oxygen and moisture sensitivity of compounds, all experiments were carried out under dry argon using standard Schlenk or glovebox techniques. Structural characterization of new compounds were made with 1H, 13C and 11B-NMR spectroscopy. Moreover, crystal structures of 1, 2, 3 and 10 were determined by single-crystal X-ray analysis.At the moment, the reactivity and functionalization of 1,3,2-diazaborolines typically occur at boron, less frequently at nitrogen, but not at carbon. This work shows that the unsaturated carbon atoms of the ring can also be functionalized. Moreover, it?s concluded to be very important that the boron heterocycles of 2 and 3, can be regarded as an anionic version of the so-called abnormal N-heterocyclic carbenes.