Isolation of diborenes and their 90°-twisted diradical congeners.
Isolation of diborenes and their 90°-twisted diradical congeners.
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DOI：
10.1038/s41467-018-02998-3
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发表时间：
2018-03-22
影响因子：
16.6
通讯作者：
Braunschweig H
中科院分区：
文献类型：
--
作者：
Böhnke J;Dellermann T;Celik MA;Krummenacher I;Dewhurst RD;Demeshko S;Ewing WC;Hammond K;Heß M;Bill E;Welz E;Röhr MIS;Mitrić R;Engels B;Meyer F;Braunschweig H
含有原子之间多个键的分子--通常是以烯烃的形式--在自然界、商业和科学中普遍存在，因此对日常生活产生了巨大的影响。考虑到它们的重要性，在过去的几十年里，人们经常试图通过弯曲和扭曲来扰乱多结合物种的结构和反应能力。然而，在寻求完全扭曲双键以均质断裂相关的π键方面只取得了一定的成功。在这里，我们介绍了通过加入具有不同电子性质的连接基团来分离基于硼的双键物种以及它们的完全扭曲的双自由基同系物。该化合物包括同一类化合物的一组经结构鉴定的抗磁性多结合和双自由基单结合同系物。到目前为止，弯曲和扭曲多个键以改变其反应性的尝试只取得了不大的成功。在这里，Braunschweig和他的同事分离了含双键的含硼物种及其90°扭曲的双自由基类似物，这要归功于它们与Lewis基本单元的稳定。
Molecules containing multiple bonds between atoms—most often in the form of olefins—are ubiquitous in nature, commerce, and science, and as such have a huge impact on everyday life. Given their prominence, over the last few decades, frequent attempts have been made to perturb the structure and reactivity of multiply-bound species through bending and twisting. However, only modest success has been achieved in the quest to completely twist double bonds in order to homolytically cleave the associated π bond. Here, we present the isolation of double-bond-containing species based on boron, as well as their fully twisted diradical congeners, by the incorporation of attached groups with different electronic properties. The compounds comprise a structurally authenticated set of diamagnetic multiply-bound and diradical singly-bound congeners of the same class of compound. Attempts to bend and twist multiple bonds in order to alter their reactivities have thus far been met with only modest success. Here, Braunschweig and colleagues isolate double-bond-containing boron-based species and their 90°-twisted diradical analogs, thanks to their stabilization with Lewis basic units.
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影响因子：
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作者：
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通讯作者：
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影响因子：
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