Aminophosphine PNH complexes of Mn(i), Fe(ii), and Co(ii) and evaluation of their activities in the transfer hydrogenation of nitriles

A series of Mn(i), Fe(ii), and Co(ii) complexes with PNH ligands bearing secondary amine functionality were prepared and tested in the catalytic transfer hydrogenation of nitriles using ammonia borane as a hydrogen source. Among all tested complexes, a tetracoordinate Fe(ii) bromide, (PNH)FeBr2, pro...

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Published inDalton transactions : an international journal of inorganic chemistry Vol. 53; no. 41; pp. 16861 - 16870
Main Authors Slamova, Ainur, Bizhanova, Ayazhan, Talimonyuk, Ofeliya, Gudun, Kristina A, Samat Tussupbayev, Dmitrienko, Anton, Kassymbek, Aishabibi, Lyssenko, Konstantin A, Khalimon, Andrey Y
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 22.10.2024
Subjects
Amines
Ammonia
Carbonyl compounds
Carbonyls
Cobalt
Hydrogenation
Iron
Ligands
Nitriles
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Summary:A series of Mn(i), Fe(ii), and Co(ii) complexes with PNH ligands bearing secondary amine functionality were prepared and tested in the catalytic transfer hydrogenation of nitriles using ammonia borane as a hydrogen source. Among all tested complexes, a tetracoordinate Fe(ii) bromide, (PNH)FeBr2, proved the most effective, representing a rare example of a highly active iron-based catalytic system for transfer hydrogenation reactions beyond carbonyl compounds and the first example of the iron catalyst for the transfer hydrogenation of nitriles to the corresponding primary amines. Mechanistic studies point out a metal–ligand cooperative mechanism enabled by the secondary amine moiety of the PNH ligand.
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ISSN:1477-9226
1477-9234
1477-9234
DOI:10.1039/d4dt02442g