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Ionic iron(III) complexes bearing a dialkylbenzimidazolium cation: Efficient catalysts for magnesium‐mediated cross‐couplings of aryl phosphates with alkyl bromides
Author(s) -
Li Zhuang,
Lu Bing,
Sun Hongmei,
Shen Qi,
Zhang Yong
Publication year - 2017
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.3671
Subject(s) - chemistry , aryl , magnesium , alkyl , catalysis , ionic bonding , bearing (navigation) , inorganic chemistry , medicinal chemistry , polymer chemistry , organic chemistry , ion , cartography , geography
A series of ionic iron(III) complexes of general formula [HL n ][FeX 4 ] (HL 1 = 1,3‐dibenzylbenzimidazolium cation, X = Cl, 1 ; HL 1 , X = Br, 2 ; HL 2 = 1,3‐dibutylbenzimidazolium cation, X = Br, 3 ; HL 3 = 1,3‐bis(diphenylmethyl)benzimidazolium cation, X = Br, 4 ) were easily prepared in high yields by the direct reaction of FeX 3 with 1 equiv. of [HL n ]X under mild conditions. All of them were characterized using elemental analysis, Raman spectroscopy and electrospray ionization mass spectrometry, and X‐ray crystallography for 1 and 4 . In the presence of magnesium turnings and LiCl, these air‐ and moisture‐insensitive complexes showed high catalytic activities in direct cross‐couplings of aryl phosphates with primary and secondary alkyl bromides with broad substrate scope, wherein complex 4 was the most effective.