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Issue 25, 2020
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Cationic indium catalysts for ring opening polymerization: tuning reactivity with hemilabile ligands

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Abstract

This is a comprehensive study of the effects of rationally designed hemilabile ligands on the stability, reactivity, and change in catalytic behavior of indium complexes. We report cationic alkyl indium complexes supported by a family of hemi-salen type ligands bearing hemilabile thiophenyl (2a), furfuryl (2b) and pyridyl (2c) pendant donor arms. Shelf-life and stability of these complexes followed the trend 2a < 2b < 2c, showing direct correlation to the affinity of the pendant donor group to the indium center. Reactivity towards polymerization of epichlorohydrin and cyclohexene oxide followed the trend 2a > 2b > 2c with control of polymerization following an inverse relationship to reactivity. Surprisingly, 2c polymerized racemic lactide without an external initiator, likely through an alkyl-initiated coordination-insertion mechanism.

Graphical abstract: Cationic indium catalysts for ring opening polymerization: tuning reactivity with hemilabile ligands

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Supplementary files

Article information


Submitted
03 Mar 2020
Accepted
13 Apr 2020
First published
22 Apr 2020

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2020,11, 6485-6491
Article type
Edge Article

Cationic indium catalysts for ring opening polymerization: tuning reactivity with hemilabile ligands

C. Goonesinghe, H. Roshandel, C. Diaz, H. Jung, K. Nyamayaro, M. Ezhova and P. Mehrkhodavandi, Chem. Sci., 2020, 11, 6485
DOI: 10.1039/D0SC01291B

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