Highly Strained Heterocycles Constructed from Boron–Boron Multiple Bonds and Heavy Chalcogens
作者:Holger Braunschweig、Philipp Constantinidis、Theresa Dellermann、William C. Ewing、Ingo Fischer、Merlin Hess、Fergus R. Knight、Anna Rempel、Christoph Schneider、Stefan Ullrich、Alfredo Vargas、J. Derek Woollins
DOI:10.1002/anie.201601691
日期:2016.4.25
and nitrogen in the formation of oxiranes and aziridines; however, such reactivity is not known between alkenes and the heavy chalcogens. Although carbon is too electronegative to affect the reduction of elements with lower relative electronegativity, the highly reducing nature of the B−B doublebond enables reactions with Se0 and Te0. The capacity of multiple bonds between boron atoms to donate electron
Strongly Phosphorescent Transition Metal π-Complexes of Boron–Boron Triple Bonds
作者:Holger Braunschweig、Theresa Dellermann、Rian D. Dewhurst、Benjamin Hupp、Thomas Kramer、James D. Mattock、Jan Mies、Ashwini K. Phukan、Andreas Steffen、Alfredo Vargas
DOI:10.1021/jacs.7b00766
日期:2017.4.5
interactions between the boron and transition metal atoms than those observed with recently published diboryne/alkali metal cation complexes. In contrast to previously reported fluorescent copper(I) π-complexes of boron-boron double bonds, the Cun-π-diboryne compounds (n = 2, 3) show intense phosphorescence in the red to near-IR region from their triplet excited states, according to their microsecond lifetimes
Metal-free binding and coupling of carbon monoxide at a boron–boron triple bond
作者:Holger Braunschweig、Theresa Dellermann、Rian D. Dewhurst、William C. Ewing、Kai Hammond、J. Oscar C. Jimenez-Halla、Thomas Kramer、Ivo Krummenacher、Jan Mies、Ashwini K. Phukan、Alfredo Vargas
DOI:10.1038/nchem.1778
日期:2013.12
Many metal-containing compounds, and some metal-free compounds, will bind carbon monoxide. However, only a handful of metal-containing compounds have been shown to induce the coupling of two or more CO molecules, potentially a method for the use of CO as a one-carbon-atom building block for the synthesis of organic molecules. In this work, CO was added to a boronâboron triple bond at room temperature and atmospheric pressure, resulting in a compound into which four equivalents of CO are incorporated: a flat, bicyclic, bis(boralactone). By the controlled addition of one CO to the diboryne compound, an intermediate in the CO coupling reaction was isolated and structurally characterized. Electrochemical measurements confirm the strongly reducing nature of the diboryne compound. The coupling of carbon monoxide molecules is an attractive prospect for organic synthesis, but only a few metal complexes are known to do this. A compound containing a boronâboron triple bond has now been shown to induce the coupling of four CO molecules, through an intermediate with a single CO.
Exclusive π Encapsulation of Light Alkali Metal Cations by a Neutral Molecule
作者:Rüdiger Bertermann、Holger Braunschweig、Philipp Constantinidis、Theresa Dellermann、Rian D. Dewhurst、William C. Ewing、Ingo Fischer、Thomas Kramer、Jan Mies、Ashwini K. Phukan、Alfredo Vargas
DOI:10.1002/anie.201506487
日期:2015.10.26
of exclusive cation–π bonding exceedingly rare. In this study, a neutral diboryne molecule is found to encapsulate the lightalkalimetalcations Li+ and Na+ in the absence of a net charge, covalent bonds, or lone‐pair donor groups. The resulting encapsulation complexes are, to our knowledge, the first structurally authenticated species in which a neutralmolecule binds the lightalkalimetals exclusively