Conclusions
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1.
The complex formation in the systems tetrabutylammonium perchlorate — BX3 (X=F, Cl, Br) in CHC13 solution was investigated by the NMR-11B method. All the boron halides studied form compounds in solution with the general formula (C4H9)4N[X3BOClO3]. The complexes with BF3 and BCl3 are stable in CHCl3 at ∼20°; the bromide complex breaks down irreversibly.
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2.
The chemical shift of11B relative to BF3·O(C2H5)2 is 0.0–7.7 and ∼2 ppm for the fluoride, chloride, and bromide complexes, respectively. In all the investigated systems, at room temperature a rapid chemical exchange of the free and complex bound boron halide is observed.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 4, pp. 738–741, April, 1975.
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Titova, K.V., Malov, Y.I., Kolmakova, E.I. et al. Investigation of the complex formation of tetrabutylammonium perchlorate with boron halides by the NMR-11B method. Russ Chem Bull 24, 664–666 (1975). https://doi.org/10.1007/BF00920669
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DOI: https://doi.org/10.1007/BF00920669