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Angew Chem Int Ed Engl. 2016 Apr 04;55(15):4786-9. doi: 10.1002/anie.201600790. Epub 2016 Mar 07.

Conversion of Dinitrogen into Acetonitrile under Ambient Conditions.

Angewandte Chemie (International ed. in English)

Isabel Klopsch, Markus Kinauer, Markus Finger, Christian Würtele, Sven Schneider

Affiliations

  1. Institut für Anorganische Chemie, Georg-August-Universität, Tammannstrasse 4, 37077, Göttingen, Germany.
  2. Institut für Anorganische Chemie, Georg-August-Universität, Tammannstrasse 4, 37077, Göttingen, Germany. [email protected].

PMID: 26948973 DOI: 10.1002/anie.201600790

Abstract

About 20% of the ammonia production is used as the chemical feedstock for nitrogen-containing chemicals. However, while synthetic nitrogen fixation at ambient conditions has had some groundbreaking contributions in recent years, progress for the direct conversion of N2 into organic products remains limited and catalytic reactions are unknown. Herein, the rhenium-mediated synthesis of acetonitrile using dinitrogen and ethyl triflate is presented. A synthetic cycle in three reaction steps with high individual isolated yields and recovery of the rhenium pincer starting complex is shown. The cycle comprises alkylation of a nitride that arises from N2 splitting and subsequent imido ligand centered oxidation to nitrile via a 1-azavinylidene (ketimido) intermediate. Different synthetic strategies for intra- and intermolecular imido ligand oxidation and associated metal reduction were evaluated that rely on simple proton, electron, and hydrogen-atom transfer steps.

© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Keywords: acetonitrile; nitrogen fixation; pincer ligands; rhenium; small-molecule activation

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