Synthesis,molecular and crystal structures,and characteristic features of electronic structures of salicylamide-based B,Si-containing chelates |
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Authors: | A A Korlyukov K A Lyssenko M Yu Antipin A G Shipov O A Zamyshlyaeva E P Kramarova Vad V Negrebetsky S A Pogozhikh Yu E Ovchinnikov Yu I Baukov |
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Institution: | (1) A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 ul. Vavilova, 119991 Moscow, Russian Federation;(2) Russian State Medical University, 1 ul. Ostrovityanova, 117997 Moscow, Russian Federation;(3) Novosibirsk State Pedagogical University, 28 ul. Vilyuiskaya, 630126 Novosibirsk, Russian Federation |
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Abstract: | The reaction of 4-(2-hydroxybenzoyl)-2,2,6,6-tetramethyl-2,6-disilamorpholine with BF3Et2O afforded (O-B)-chelate 4-2-(difluoroboroxy)benzoyl]-2,2,6,6-tetramethyl-2,6-disilamorpholine. Treatment of the latter with BF3Et2O or SOCl2 gave rise to products of the disilamorpholine ring opening, viz., (O-B) chelate 2-(difluoroboroxy)-N,N-bis(dimethylfluorosilylmethyl)benzamide or 2-(difluoroboroxy)-N, N-bis(dimethylchlorosilylmethyl)benzamide, respectively. The structures of the compounds synthesized were confirmed by X-ray diffraction analysis and 1H, 13C, and 29Si NMR spectroscopy. High-precision X-ray diffraction study and quantum-chemical calculations demonstrated that the coordination OSi bond is absent in the two last-mentioned compounds.Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1846–1853, September, 2004. |
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Keywords: | 2 6-disilamorpholines pentacoordinate silicon compounds tetracoordinate boron compounds X-ray diffraction study electron density distribution quantum-chemical calculations |
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