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- W2949962034 abstract "The adducts pyr•BF 2 Br and pyr•BFBr 2 (pyr = pyridine) form fluoroboron cations by displacement of Br − by excess pyridine, the ease of cation formation being pyr 2 BF 2 + » pyr 2 BFBr + » pyr 3 BF 2+ •Cl − can be displaced from pyr•BF 2 Cl and pyr•BFCl 2 , but much less readily, to form pyr 2 BF 2 + , pyr 2 BFCl + , and, under forcing conditions, a few percent of pyr 3 BF 2+ . Non-fluorine-containing mixed boron trihalide adducts of pyridine also form haloboron cations by heaviest-halide-ion displacement, for example pyr•BClI 2 giving pyr 2 BClI + , the ease of displacement always being I − > Br − > Cl − , and displacement always occurring more readily from mixed boron trihalide adducts than from unmixed-halogen adducts. The mechanistic implications of this are discussed. ortho Substituents greatly reduce the ability of pyridine to displace heavy halide ion, so 2-methylpyridine gives 2-Mepyr 2 BF 2 + and 2-Mepyr 2 BFBr + but not 2-Mepyr 2 BFCl + or 2-Mepyr 3 BF 2+ , while 2,6-dimethylpyridine does not form any haloboron cations. 19 F spin-lattice relaxation times of the fluoroboron cations are much shorter than those of neutral boron trihalide adducts in the same solution, and provide a further diagnostic test for their presence. Key words: fluoroboron cations, pyridines, mixed boron trihalide adducts, fluorine-19 NMR, boron-11 NMR." @default.
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- W2949962034 date "1996-07-01" @default.
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- W2949962034 title "Bis(pyridine)difluoroboron, tris(pyridine)fluoroboron, and other (pyridine)haloboron cations. A systematic NMR study" @default.
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- W2949962034 doi "https://doi.org/10.1139/v96-146" @default.
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