Issue 37, 2016

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

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

Supplementary files

Article information

Article type
Paper
Submitted
30 Apr 2016
Accepted
13 Jun 2016
First published
21 Jun 2016

Dalton Trans., 2016,45, 14734-14744

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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