Approaching a "Naked" Boryl Anion: Amide Metathesis as a Route to Calcium, Strontium, and Potassium Boryl Complexes.

Approaching a "Naked" Boryl Anion: Amide Metathesis as a Route to Calcium, Strontium, and Potassium Boryl Complexes.
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DOI:
10.1002/anie.202011839
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发表时间:
2021-01-25
期刊:
Angewandte Chemie (International ed. in English)
影响因子:
--
通讯作者:
Aldridge S
Aldridge S
中科院分区:
其他
文献类型:
--
作者:
Protchenko AV;Vasko P;Fuentes MÁ;Hicks J;Vidovic D;Aldridge S

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酰胺复分解已被用于通过相应的双(酰胺) M{N(SiMe3)2}2(thf)2 与 (thf)2Li 反应生成第一个具有结构特征的钙和锶硼基配合物 {(Me3Si)2N}M{B(NDippCH)2}(thf)n (M=Ca, n=2; M=Sr, n=3)。 {B(NDippCH)2}。最值得注意的是,这种方法也可以应用于类似的酰胺钾 K{N(SiMe3)2},从而形成无溶剂的硼基钾二聚体 [K{B(NDippCH)2}]2,该二聚体在室温下可以长时间保持固态稳定 (48 h)。晶体学上确定了二聚体结构,其中 K+ 阳离子与侧翼 Dipp 基团的内碳和二氮硼杂环的硼中心相互作用较弱,K⋅⋅⋅B 距离 >3.1 Å。这些结构特征以及分子中的原子(QTAIM)计算表明,含硼片段非常接近凝聚相中“游离”硼基阴离子的限制描述。酰胺复分解被用作制备 K、Ca 和 Sr 硼基化合物的途径。晶体学和分子中原子研究表明,二聚钾系统接近“游离”硼基阴离子的限制性描述。
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. Amide metathesis is exploited as a route to boryl compounds of K, Ca, and Sr. The dimeric potassium system is shown by crystallographic and atoms‐in‐molecules studies to approach a limiting description as a “free” boryl anion.
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