Approaching a “Naked” Boryl Anion : Amide Metathesis as a Route to Calcium, Strontium, and Potassium Boryl Complexes
Protchenko, A. V., Vasko, P., Fuentes, M. Á., Hicks, J., Vidovic, D., & Aldridge, S. (2021). Approaching a “Naked” Boryl Anion : Amide Metathesis as a Route to Calcium, Strontium, and Potassium Boryl Complexes. Angewandte Chemie, 60(4), 2064-2068. https://doi.org/10.1002/anie.202011839
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Angewandte ChemieAuthors
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2021Discipline
Epäorgaaninen kemiaEpäorgaaninen ja analyyttinen kemiaInorganic ChemistryInorganic and Analytical ChemistryCopyright
© 2020 the Authors
Amide metathesis has been used to generate the first structurally characterized boryl complexes of calcium and strontium, {(Me3Si)2N}M{B(NDippCH)2}(thf)n (M=Ca, n=2; M=Sr, n=3), through the reactions of the corresponding bis(amides), M{N(SiMe3)2}2(thf)2, with (thf)2Li‐ {B(NDippCH)2}. Most notably, this approach can also be applied to the analogous potassium amide K{N(SiMe3)2}, leading to the formation of the solvent‐free borylpotassium dimer [K{B(NDippCH)2}]2, which is stable in the solid state at room temperature for extended periods (48 h). A dimeric structure has been determined crystallographically in which the K+ cations interact weakly with both the ipso‐carbons of the flanking Dipp groups and the boron centres of the diazaborolyl heterocycles, with K⋅⋅⋅B distances of >3.1 Å. These structural features, together with atoms in molecules (QTAIM) calculations imply that the boron‐containing fragment closely approaches a limiting description as a “free” boryl anion in the condensed phase.
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Postdoctoral Researcher, AoFAdditional information about funding
We thank the Leverhulme Trust (F/08699/E and RP-2018- 246) and EPSRC (EP/F019181/1, EP/K014714/1) for funding aspects of this work. P.V. thanks the Academy of Finland (Grant No. 314794)License
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