PUB - Publikationen an der Universität Bielefeld

Carbocyclic aluminium halides [(ADC)AlX2]2 (2-X) (X = F, Cl, and I) based on an anionic dicarbene (ADC = PhC{N(Dipp)C}2, Dipp = 2,6-iPr2C6H3) framework are prepared as crystalline solids by dehydrohalogenations of the alane [(ADC)AlH2]2 (1). KC8 reduction of 2-I affords the peri-annulated Al(III) compound [(ADCH)AlH]2 (4) (ADCH = PhC{N(Dipp)C2(DippH)N}, DippH = 2-iPr,6-(Me2C)C6H3)) as a colorless crystalline solid in 76% yield. The formation of 4 suggests intramolecular insertion of the putative bis-aluminylene species [(ADC)Al]2 (3) into the methine C-H bond of HCMe2 group. Calculations predict singlet ground state for 3, while the conversion of 3 into 4 is thermodynamically favored by 61 kcal/mol. Compounds 2-F, 2-Cl, 2-I, and 4 have been characterized by NMR spectroscopy and their solid-state molecular structures have been established by single crystal X-ray diffraction. © 2024 Wiley-VCH GmbH.