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Issue 18, 2017
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Non-symmetrical, potentially redox non-innocent imino NHC pyridine ‘pincers’ via a zinc ion template-assisted synthesis

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Abstract

New non-symmetrical, redox-active imino NHC pyridine pincer ligands, 2-(R1-imidazol-2-ylidene)-6-(R2N[double bond, length as m-dash]CH)-pyridine (R1 = 2,6-diisopropylphenyl (DiPP), R2 = 2,4,6-trimethylphenyl (Mes), 4B; R1 = R2 = DiPP, 4C), have been accessed by a ZnII-promoted modular synthesis involving the quaternization of R1-imidazole by [Zn(κNimineκNpyridine)(2-(R2N[double bond, length as m-dash]CH)-6-bromo-pyridine)Cl2], followed by ZnII removal and deprotonation of imidazolium pro-ligands. Redox active forms of 4B were implicated in the two complexes obtained by its reaction with FeBr2/KC8; metrical data analysis pointed to the occurrence of radical anionic and dianionic redox states of 4B.

Graphical abstract: Non-symmetrical, potentially redox non-innocent imino NHC pyridine ‘pincers’ via a zinc ion template-assisted synthesis

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Publication details

The article was received on 21 Mar 2017, accepted on 30 Mar 2017 and first published on 30 Mar 2017


Article type: Paper
DOI: 10.1039/C7DT01014A
Citation: Dalton Trans., 2017,46, 5955-5964
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    Non-symmetrical, potentially redox non-innocent imino NHC pyridine ‘pincers’ via a zinc ion template-assisted synthesis

    T. Simler, A. A. Danopoulos and P. Braunstein, Dalton Trans., 2017, 46, 5955
    DOI: 10.1039/C7DT01014A

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