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π‐Complexes of Diborynes with Main Group Atoms
Author(s) -
Ewing William C.,
Dellermann Theresa,
Angel Wong Y. T.,
Mattock James D.,
Vargas Alfredo,
Bryce David L.,
Dewhurst Rian D.,
Braunschweig Holger
Publication year - 2020
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.202000185
Subject(s) - tellurate , metallacycle , boron , tellurium , chemistry , molecule , group (periodic table) , crystallography , metal , triple bond , stereochemistry , main group element , computational chemistry , physics , inorganic chemistry , polymer chemistry , transition metal , double bond , x ray crystallography , ion , organic chemistry , catalysis , diffraction , optics
We present herein an in‐depth study of complexes in which a molecule containing a boron‐boron triple bond is bound to tellurate cations. The analysis allows the description of these salts as true π complexes between the B−B triple bond and the tellurium center. These complexes thus extend the well‐known Dewar‐Chatt‐Duncanson model of bonding to compounds made up solely of p block elements. Structural, spectroscopic and computational evidence is offered to argue that a set of recently reported heterocycles consisting of phenyltellurium cations complexed to diborynes bear all the hallmarks of π‐complexes in the π‐complex/metallacycle continuum envisioned by Joseph Chatt. Described as such, these compounds are unique in representing the extreme of a metal‐free continuum with conventional unsaturated three‐membered rings (cyclopropenes, azirenes, borirenes) occupying the opposite end.