New research article from the Skrydstrup Group

Congratulations to Martin B. Johansen, Oliver R. Gedde, Thea S. Mayer and Troels Skrydstrup on their newly published article!

Access to Aryl and Heteroaryl Trifluoromethyl Ketones from Aryl Bromides and Fluorosulfates with Stoichiometric CO

Abstract
We report a sequential one-pot preparation of aromatic trifluoromethyl ketones starting from readily accessible aryl bromides and fluorosulfates, the latter easily prepared from the corresponding phenols. The methodology utilizes low pressure carbon monoxide generated ex situ from COgen to generate Weinreb amides as reactive intermediates that undergo monotrifluoromethylation affording the corresponding aromatic trifluoromethyl ketones (TFMKs) in good yields. The stoichiometric use of CO enables the possibility for accessing 13C-isotopically labeled TFMK by switching to the use of 13COgen.

Read at:

For a list of publications by the members of NordCO2, see our Publications page!

Accepted manuscript from the Hammarström Group

Congratulations to the Leif Hammarström research group at Uppsala University on their ercently accepted manuscript!

From non-innocent to guilty: on the role of redox-active ligand in the electro-assisted reduction of CO2 mediated by a cobalt(II)-polypyridyl complex
N. Queyriaux, K. Abel, J. Fize, J. Pécaut, M. Orio and L. Hammarström
Sustainable Energy & Fuels (2020) accepted 11/5 2020

 Abstract

The electrochemical behavior of [Co(bapbpy)Cl]+ [1-Cl]+, a pentacoordinated polypyridyl cobalt(II) complex containing a redox-active pseudo-macrocyclic ligand (bapbpy: 6,6’-bis-(2-aminopyridyl)-2,2’-bipyridine) has been investigated in DMF. Cyclic voltammograms (CV), recorded in the presence of increasing amounts of chloride anions, highlighted the existence of an equilibrium with the neutral hexacoordinated complex. Under a CO2 atmosphere, CVs of [Co(bapbpy)Cl]+ exhibit significant current enhancement assigned to CO2 catalytic reduction. Controlled-potential electrolysis experiments confirmed formation of CO and HCOOH as the only identifiable products. The addition of water or chloride ions was shown to affect the distribution of the products obtained, as well as the faradaic efficiency associated with their electrocatalytic generation. A combination of electrochemical techniques, chemical reductions, spectroscopic measurements (UV-Vis and IR) and quantum chemical calculations suggests that the ability of the bapbpy ligand to be reduced at moderately negative potentials drastically limits the catalytic performances of [1-Cl]+, by stabilizing the formation of a catalytically-competent CO2-adduct that only slowly reacts with oxide acceptors to evolve towards the desired reduction products.

New issue of Organometallics on CO2 conversion

The latest issue of the journal Organometallics, published just yesterday, is a special issue on CO2 conversion, with our own Assoc. Prof. Kathrin H. Hopmann as editor. Be sure to read the editorial she has written with Prof. N. Iwasawa from the Tokyo Institute of Technology and Prof. N. Hazari from Yale University !
She also designed the cover in collaboration with Dr. J. Darmon from Princeton University.

The article from Marc Obst, Ashot Gevorgyan, Annette Bayer, and Kathrin Hopmann on Copper-Catalyzed Carboxylations is also included in this issue. Congratulations!