PUB - Publikationen an der Universität Bielefeld

Cyclic organoalane compounds [(ADCAr)AlH2]2 (ADCAr = ArC{(DippN)C}2; Dipp = 2,6-iPr2C6H3; Ar = Ph or 4-PhC6H4 (Bp)) based on anionic dicarbene (ADC) frameworks have been reported as crystalline solids. Treatments of Li(ADCAr) with LiAlH4 at room temperature afford [(ADCAr)AlH2]2 with the concomitant release of LiH. Compounds [(ADCAr)AlH2]2 are stable crystalline solids and are freely soluble in common organic solvents. They are annulated tricyclic compounds with an almost planar central C4Al2-core embedded between two peripheral 1,3-imidazole (C3N2) rings. At room temperature, [(ADCPh)AlH2]2 readily reacts with CO2 to form two- and four-fold hydroalumination products [(ADCPh)AlH(OCHO)]2 and [(ADCPh)Al(OCHO)2]2, respectively. Further hydroalumination reactivity of [(ADCAr)AlH2]2 has been shown with isocyanate (RNCO) and isothiocyanate (RNCS) species (R = alkyl or aryl group). All compounds have been characterized by NMR spectroscopy, mass spectrometry, and single crystal X-ray diffraction. © 2023 Wiley-VCH GmbH.