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Issue 37, 2016
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Sterically (un)encumbered mer-tridentate N-heterocyclic carbene complexes of titanium(iv) for the copolymerization of cyclohexene oxide with CO2

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Abstract

Titanium(IV) complexes bearing an unsubstituted tridentate bis(phenolate) N-heterocyclic carbene (NHC) were synthesized and structurally identified. While sterically unencumbered NHC–Ti(IV) complexes bearing chloro and alkoxy co-ligands tend to dimerize in solution and in solid-state, the use of a bulky aryloxy as co-ligand favors the monomeric species. Upon activation by onium salts, all these complexes were found to be highly selective towards the copolymerization of cyclohexene oxide (CHO) with CO2 under mild conditions (PCO2 < 1 bar), albeit the sterically unencumbered NHC–Ti(IV) complexes are less stable and active than their structural analogues bearing bulkier substituents.

Graphical abstract: Sterically (un)encumbered mer-tridentate N-heterocyclic carbene complexes of titanium(iv) for the copolymerization of cyclohexene oxide with CO2

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Publication details

The article was received on 30 Apr 2016, accepted on 13 Jun 2016 and first published on 21 Jun 2016


Article type: Paper
DOI: 10.1039/C6DT01706A
Dalton Trans., 2016,45, 14734-14744

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    Sterically (un)encumbered mer-tridentate N-heterocyclic carbene complexes of titanium(IV) for the copolymerization of cyclohexene oxide with CO2

    J. Hessevik, R. Lalrempuia, H. Nsiri, K. W. Törnroos, V. R. Jensen and E. Le Roux, Dalton Trans., 2016, 45, 14734
    DOI: 10.1039/C6DT01706A

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