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Air Stable Iron(II) PNP Pincer Complexes as Efficient Catalysts for the Selective Alkylation of Amines with Alcohols
Author(s) -
Mastalir Matthias,
Stöger Berthold,
Pittenauer Ernst,
Puchberger Michael,
Allmaier Günter,
Kirchner Karl
Publication year - 2016
Publication title -
advanced synthesis and catalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.541
H-Index - 155
eISSN - 1615-4169
pISSN - 1615-4150
DOI - 10.1002/adsc.201600689
Subject(s) - chemistry , pincer movement , alkylation , catalysis , pincer ligand , pyridine , ligand (biochemistry) , combinatorial chemistry , medicinal chemistry , primary (astronomy) , organic chemistry , polymer chemistry , biochemistry , physics , receptor , astronomy
A series of well‐defined iron(II) complexes of the types [Fe(PNP)Br 2 ] and [Fe(PNP)(CO)Br 2 ] 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)Br 2 ] are catalytically inactive. The low‐spin complexes [Fe(PNP)(CO)Br 2 ] 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.