Abstract
Reduction of benzophenone and 4,4′-bis(methoxy)benzophenone with the aluminum complex (dpp-BIAN)AlI(Et2O) (1) containing the dianionic dpp-BIAN ligand (dpp-BIAN is 1,2-bis[(2,6-diisopropylphenyl)imino]acenaphthene) affords the pinacolate complexes [(dpp-BIAN)AlI]2[μ-O2C2Ph4] (2) and [(dpp-BIAN)AlI]2[μ-O2C2(C6H4OMe)4] (3), respectively, which undergo the pinacolone rearrangement upon prolonged storage in diethyl ether to form [(dpp-BIAN)AlI]2O (4). The reaction of 1 with fluoren-9-one produces stable pinacolate (dpp-BIAN)Al[μ-O2(C13H8)2] (7) and the (dpp-BIAN)AlI2 complex (8). Compounds 2—4, 7, and 8 were characterized by ESR spectroscopy. Hydrolysis products of compounds 2 and 3 were characterized by 1H NMR spectroscopy. The structures of complexes 4 and 7 were established by X-ray diffraction.
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dpp-BIAN is 1,2-bis[(2,6-diisopropylphenyl)imino]acenaphthene
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1134–1140, July, 2006.
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Fedushkin, I.L., Lukoyanov, A.N., Fukin, G.K. et al. Reduction of aromatic ketones with the (dpp-BIAN)AlI(Et2O) complex. Russ Chem Bull 55, 1177–1183 (2006). https://doi.org/10.1007/s11172-006-0396-7
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DOI: https://doi.org/10.1007/s11172-006-0396-7