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Bottleable Neutral Analogues of [B 2 H 5 ] − as Versatile and Strongly Binding η 2 Donor Ligands
Author(s) -
Wang Sunewang R.,
Prieschl Dominic,
Mattock James D.,
Arrowsmith Merle,
Pranckevicius Conor,
Stennett Tom E.,
Dewhurst Rian D.,
Vargas Alfredo,
Braunschweig Holger
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201801722
Subject(s) - diborane , chemistry , crystallography , boron , copper , moiety , pyridine , hydrogen bond , stereochemistry , ligand (biochemistry) , molecule , medicinal chemistry , biochemistry , receptor , organic chemistry
Herein we report the discovery that two bottleable, neutral, base‐stabilized diborane(5) compounds are able to bind strongly to a number of copper(I) complexes exclusively through their B−B bond. The resulting complexes represent the first known complexes containing unsupported, neutral σ B−B diborane ligands. Single‐crystal X‐ray analyses of these complexes show that the X−Cu moiety (X=Cl, OTf, C 6 F 5 ) lies opposite the bridging hydrogen atom of the diborane and is near perpendicular to the B−B bond, interacting almost equally with both boron atoms and causing a B−B bond elongation. DFT studies show that σ donation from and π backdonation to the pseudo‐π‐like B−B bond account for their formation. Astoundingly, these copper σ B−B complexes are inert to ligand exchange with pyridine under either heating or photoirradiation.