title: A Reusable Co Catalyst for the Selective Hydrogenation of Functionalized Nitroarenes and the Direct Synthesis of Imines and Benzimidazoles from Nitroarenes and Aldehydes.
abstract: The use of abundantly available transition metals in reactions that have been preferentially mediated by rare noble metals, for example, hydrogenations, is a desirable aim in catalysis and an attractive strategy for element conservation. The observation of novel selectivity patterns with such inexpensive metal catalysts is especially appealing. Herein, we report a novel, robust, and reusable cobalt catalyst that permits the selective hydrogenation of nitroarenes in the presence of highly hydrogenation-sensitive functional groups, as well as the direct synthesis of imines from nitroarenes and aldehydes or ketones in the presence of such substituents. Furthermore, we introduce the first base-metal-mediated direct synthesis of benzimidazoles from nitroarenes and aldehydes. Functional groups that are easy to hydrogenate are again well tolerated.
authors: Anorganische Chemie II - Katalysatordesign, Universität Bayreuth, 95440, Bayreuth, Germany.
authors: Tobias
authors: T
authors: Schwob
authors: Anorganische Chemie II - Katalysatordesign, Universität Bayreuth, 95440, Bayreuth, Germany.
authors: Rhett
authors: R
authors: Kempe
keywords: benzimidazoles; cobalt catalysis; hydrogenation; imines; nitroarenes