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Access to Fe II Bis(σ‐B−H) Aminoborane Complexes through Protonation of a Borohydride Complex and Dehydrogenation of Amine‐Boranes
Author(s) -
Gorgas Nikolaus,
Stöger Berthold,
Veiros Luis F.,
Kirchner Karl
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201906971
Subject(s) - chemistry , protonation , borohydride , boranes , dehydrogenation , nuclear magnetic resonance spectroscopy , cationic polymerization , diborane , medicinal chemistry , sodium borohydride , amine gas treating , reaction intermediate , bioinorganic chemistry , reaction mechanism , stereochemistry , crystallography , polymer chemistry , organic chemistry , boron , catalysis , ion
Herein, we report on the first synthesis and structural characterization of the iron based aminoborane complexes [Fe(PNP)(H)(η 2 :η 2 ‐H 2 B=NR 2 )] + (R=H, Me). These species are formed upon protonation of the borohydride complex [Fe(PNP)(H)(η 2 ‐BH 4 )] by ammonium salts [NH 2 R 2 ] + (R=H, Me). For R=Me, the reaction proceeds via the cationic dinuclear intermediate [{Fe(PNP)(H)} 2 (μ 2 ,η 2 :η 2 ‐BH 4 )] + . A mechanism for the reaction is proposed based on DFT calculations that also indicate the final aminoborane complex as the thermodynamic product. All complexes were characterized by NMR spectroscopy, HRMS, and X‐ray crystallography.