Air Stable Iron(II) PNP Pincer Complexes as Efficient Catalysts for the Selective Alkylation of Amines with Alcohols

A series of well‐defined iron(II) complexes of the types [Fe(PNP)Br2] and [Fe(PNP)(CO)Br2] with PNP pincer ligands based on triazine and pyridine backbones were prepared and fully characterized. These complexes were tested as catalysts for the alkylation of amines by alcohols. The high‐spin complexe...

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Bibliographic Details
Published in:Advanced synthesis & catalysis 2016-12, Vol.358 (23), p.3824-3831
Main Authors: Mastalir, Matthias, Stöger, Berthold, Pittenauer, Ernst, Puchberger, Michael, Allmaier, Günter, Kirchner, Karl
Format: Article
Language:English
Subjects:
Alcohols
Alkylation
Amines
Bearing
Catalysis
Catalysts
homogeneous catalysis
iron complexes
Ligands
pincer complexes
Proposals
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Summary:A series of well‐defined iron(II) complexes of the types [Fe(PNP)Br2] and [Fe(PNP)(CO)Br2] with PNP pincer ligands based on triazine and pyridine backbones were prepared and fully characterized. These complexes were tested as catalysts for the alkylation of amines by alcohols. The high‐spin complexes [Fe(PNP)Br2] are catalytically inactive. The low‐spin complexes [Fe(PNP)(CO)Br2] bearing a carbonyl co‐ligand efficiently and selectively convert primary alcohols and aromatic and benzylic amines selectively into mono‐N‐alkylated amines in good to excellent isolated yields. A mechanistic proposal is given.
ISSN:1615-4150
1615-4169
DOI:10.1002/adsc.201600689