Ionic iron(III) complex of aryloxo-linked bis(imidazolium)cations: efficient and recyclable catalyst

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A novel phenol-linked bis(imidazolium) salt,H3LCl2(L = O-4-C(CH3)3-C6H2-2,6-di[CH2{C(NCHCHNAr)}]2, Ar = 2,6-diisopropylphenyl, 1), was designed and used to prepare an ionic iron(III) complex [H2L][Fe Cl4](2).Complex 2 was a highly efficient catalyst for aryl Grignard cross-coupling of alkyl chlorides bearing b-hydrogens.Furthermore, complex 2 was reusable and could be reused in at least eight times without significant loss in catalytic activity. A novel phenol-linked bis (imidazolium) salt, H3LCl2 (L = O-4-C (CH3) 3-C6H2-2,6-di [CH2 {C (NCHCHNAr) , 1), was designed and used to prepare an ionic iron (III) complex [H2L] [FeCl4] (2) .Complex 2 was a highly efficient catalyst for aryl Grignard cross-coupling of alkyl chlorides bearing b-hydrogens. , complex 2 was reusable and could be reused in at least eight times without significant loss in catalytic activity.
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