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Anionic Organoboranes: Delicate Flowers Worth Caring for
European Journal of Inorganic Chemistry ( IF 2.2 ) Pub Date : 2020-09-04 , DOI: 10.1002/ejic.202000786
Hendrik Budy 1 , Jannik Gilmer 1 , Timo Trageser 1 , Matthias Wagner 1
Affiliation  

Subvalent boron compounds contain boron atoms with oxidation numbers lower than +III. Over the last decades, the development of isolable derivatives has relied heavily on the use of specially designed ligands capable of stabilizing the electron‐rich boron centers electronically or through steric protection. Herein, we are exclusively reviewing anionic organo(hydro)boranes largely devoid of stabilizing ligands or heteroatom substituents. The restriction to these subvalent species is intended to minimize the risk of ligand artifacts being included when carving out the characteristic properties of the respective boron centers, such as nucleophilic or carbenoid behavior. The scope of this review encompasses triorganoborane radical monoanions ([·BR3]) along with closed‐shell dianions ([:BR3]2–), boryl anions ([:BR2]), as well as B–B single‐bonded diborane(6) dianions ([R3B–BR3]2–) and diborane(5) monoanions ([R2B–BR3]), and finally B=B double‐bonded diborane(4) dianions ([R2B=BR2]2–). We are showing how these species are related to each other and comment on their bonding situations from an experimentalist's perspective.

中文翻译:

阴离子有机oboranes:值得照顾的精美花

亚价硼化合物包含氧化数低于+ III的硼原子。在过去的几十年中,可分离衍生物的开发在很大程度上依赖于使用专门设计的配体,这些配体能够以电子方式或通过空间保护来稳定富电子的硼中心。在本文中,我们专门审查基本上没有稳定配体或杂原子取代基的阴离子有机(氢)硼烷。对这些亚价物种的限制旨在最大程度地减少在雕刻出各个硼中心的特性(如亲核或类胡萝卜素行为)时包括配体伪影的风险。审查的范围包括三有机硼烷自由基单阴离子([ · BR 3 ] ),闭壳二价阴离子[ [:BR 3 ] 2–,硼酸根阴离子[[:BR 2 ] )以及B–B单键联乙硼烷(6)阴离子([R 3 B–BR 3 ] 2–)和乙硼烷(5)一元阴离子([R 2 B–BR 3 ] ),最后是B = B双键联乙硼烷(4)双阴离子([R 2 B = BR 2 ] 2–)。我们将展示这些物种之间的相互关系,并从实验者的角度评论它们的结合情况。
更新日期:2020-09-04
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