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Boron-boron multiple bonding

Total Cost €


EC-Contrib. €






Project "multiBB" data sheet

The following table provides information about the project.


Organization address
address: SANDERRING 2
postcode: 97070

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
telephone: n.a.
fax: n.a.

 Coordinator Country Germany [DE]
 Total cost 2˙500˙000 €
 EC max contribution 2˙500˙000 € (100%)
 Programme 1. H2020-EU.1.1. (EXCELLENT SCIENCE - European Research Council (ERC))
 Code Call ERC-2014-ADG
 Funding Scheme ERC-ADG
 Starting year 2016
 Duration (year-month-day) from 2016-05-01   to  2021-04-30


Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 


 Project objective

Multiple bonding between atoms is immensely important to chemistry, biology, physics and their associated industries; multiple bonds are both ubiquitous in everyday products and extremely useful functionalities for effecting chemical transformations. While very common with the elements carbon, nitrogen and oxygen, multiple bonding is in comparison extremely rare with other elements. Multiple bonding between heavier elements of the main group of the periodic table becomes less favourable the heavier the element becomes. However, this does not explain the relative paucity of multiple bonding with boron, which is immediately to carbon's left on the periodic table. In particular, isolable, stable compounds containing multiple bonds between two boron atoms are extremely rare, and until 2007 only a handful of charged examples existed.

A revolution in this field has recently been witnessed with the syntheses of the first neutral compounds with boron-boron double bonds, diborenes, and the first compounds with boron-boron triple bonds, diborynes. The first neutral diborenes were prepared in 2007, however, we have recently developed a number of rational, selective and more general routes to these compounds. The first diboryne compounds were prepared by our group in 2012. The significance of these two families of molecules is not only their unusual multiple bonding but also the extremely high electron density on the boron atoms, an unusual situation for an element that is known for its electron-poor character. This high electron density leads to strong boron-based nucleophilicity and extremely high reduction potentials – both highly novel phenomena.

This proposal aims to: (A) comprehensively explore the syntheses of these unique compounds and the limits thereof, and to (B) exploit the unusual reactivity of these electron-rich boron molecules in synthesis, small-molecule activation and materials science.


year authors and title journal last update
List of publications.
2018 Tom E. Stennett, James D. Mattock, Leanne Pentecost, Alfredo Vargas, Holger Braunschweig
Chelated Diborenes and Their Inverse-Electron-Demand Diels-Alder Reactions with Dienes
published pages: 15276-15281, ISSN: 1433-7851, DOI: 10.1002/anie.201809217
Angewandte Chemie International Edition 57/46 2019-06-06
2019 Marc-André Légaré, Conor Pranckevicius, Holger Braunschweig
Metallomimetic Chemistry of Boron
published pages: , ISSN: 0009-2665, DOI: 10.1021/acs.chemrev.8b00561
Chemical Reviews 2019-06-06
2019 Tom E. Stennett, Philipp Bissinger, Stefanie Griesbeck, Stefan Ullrich, Ivo Krummenacher, Michael Auth, Andreas Sperlich, Matthias Stolte, Krzysztof Radacki, Chang-Jiang Yao, Frank Würthner, Andreas Steffen, Todd B. Marder, Holger Braunschweig
Near-Infrared Quadrupolar Chromophores Combining Three-Coordinate Boron-Based Superdonor and Superacceptor Units
published pages: 6449-6454, ISSN: 1433-7851, DOI: 10.1002/anie.201900889
Angewandte Chemie International Edition 58/19 2019-06-06
2018 Tom E. Stennett, James D. Mattock, Ivonne Vollert, Alfredo Vargas, Holger Braunschweig
Unsymmetrical, Cyclic Diborenes and Thermal Rearrangement to a Borylborylene
published pages: 4098-4102, ISSN: 1433-7851, DOI: 10.1002/anie.201800671
Angewandte Chemie International Edition 57/15 2019-04-18
2018 Julian Böhnke, Merle Arrowsmith, Holger Braunschweig
Reactivity Enhancement of a Zerovalent Diboron Compound by Desymmetrization
published pages: 10368-10373, ISSN: 0002-7863, DOI: 10.1021/jacs.8b06930
Journal of the American Chemical Society 140/32 2019-04-18
2018 Merle Arrowsmith, James D. Mattock, Julian Böhnke, Ivo Krummenacher, Alfredo Vargas, Holger Braunschweig
Direct access to a cAAC-supported dihydrodiborene and its dianion
published pages: 4669-4672, ISSN: 1359-7345, DOI: 10.1039/C8CC01580E
Chemical Communications 54/37 2019-04-18
2018 Dominic Auerhammer, Merle Arrowsmith, Rian D. Dewhurst, Thomas Kupfer, Julian Böhnke, Holger Braunschweig
Closely related yet different: a borylene and its dimer are non-interconvertible but connected through reactivity
published pages: 2252-2260, ISSN: 2041-6520, DOI: 10.1039/c7sc04789d
Chemical Science 9/8 2019-04-18
2018 Julian Böhnke, Tobias Brückner, Alexander Hermann, Oscar F. González-Belman, Merle Arrowsmith, J. Oscar C. Jiménez-Halla, Holger Braunschweig
Single and double activation of acetone by isolobal BN and BB triple bonds
published pages: 5354-5359, ISSN: 2041-6520, DOI: 10.1039/C8SC01249K
Chemical Science 9/24 2019-04-18
2018 Julian Böhnke, Holger Braunschweig, J. Oscar C. Jiménez-Halla, Ivo Krummenacher, Tom E. Stennett
Half-Sandwich Complexes of an Extremely Electron-Donating, Redox-Active η 6 -Diborabenzene Ligand
published pages: 848-853, ISSN: 0002-7863, DOI: 10.1021/jacs.7b12394
Journal of the American Chemical Society 140/2 2019-04-18
2018 Andreas Stoy, Julian Böhnke, J. Oscar C. Jiménez-Halla, Rian D. Dewhurst, Torsten Thiess, Holger Braunschweig
CO 2 Binding and Splitting by Boron-Boron Multiple Bonds
published pages: 5947-5951, ISSN: 1433-7851, DOI: 10.1002/anie.201802117
Angewandte Chemie International Edition 57/20 2019-04-18
2018 Julian Böhnke, Theresa Dellermann, Mehmet Ali Celik, Ivo Krummenacher, Rian D. Dewhurst, Serhiy Demeshko, William C. Ewing, Kai Hammond, Merlin Heß, Eckhard Bill, Eileen Welz, Merle I. S. Röhr, Roland Mitrić, Bernd Engels, Franc Meyer, Holger Braunschweig
Isolation of diborenes and their 90°-twisted diradical congeners
published pages: , ISSN: 2041-1723, DOI: 10.1038/s41467-018-02998-3
Nature Communications 9/1 2019-04-18
2018 Jessica Cid, Alexander Hermann, James E. Radcliffe, Liam D. Curless, Holger Braunschweig, Michael J. Ingleson
Synthesis of Unsymmetrical Diboron(5) Compounds and Their Conversion to Diboron(5) Cations
published pages: 1992-1998, ISSN: 0276-7333, DOI: 10.1021/acs.organomet.8b00288
Organometallics 37/12 2019-04-18
2018 Alexander Hermann, Jessica Cid, James D. Mattock, Rian D. Dewhurst, Ivo Krummenacher, Alfredo Vargas, Michael J. Ingleson, Holger Braunschweig
Diboryldiborenes: π-Conjugated B 4 Chains Isoelectronic to the Butadiene Dication
published pages: 10091-10095, ISSN: 1433-7851, DOI: 10.1002/anie.201805394
Angewandte Chemie International Edition 57/32 2019-04-18

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