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Anionic Organoboranes: Delicate Flowers Worth Caring for
Author(s) -
Budy Hendrik,
Gilmer Jannik,
Trageser Timo,
Wagner Matthias
Publication year - 2020
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.202000786
Subject(s) - chemistry , diborane , boranes , boron , nucleophile , heteroatom , steric effects , ligand (biochemistry) , stereochemistry , computational chemistry , organic chemistry , catalysis , ring (chemistry) , biochemistry , receptor
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 ([ · BR 3 ] – ) along with closed‐shell dianions ([:BR 3 ] 2– ), boryl anions ([:BR 2 ] – ), as well as B–B single‐bonded diborane(6) dianions ([R 3 B–BR 3 ] 2– ) and diborane(5) monoanions ([R 2 B–BR 3 ] – ), and finally B=B double‐bonded diborane(4) dianions ([R 2 B=BR 2 ] 2– ). We are showing how these species are related to each other and comment on their bonding situations from an experimentalist's perspective.