The effect of steric changes on the isoselectivity of dinuclear indium catalysts for lactide polymerization

Dalton Transactions : an International Journal of Inorganic Chemistry
Kimberly M OstenParisa Mehrkhodavandi

Abstract

A series of (±)- and (R,R)-tridentate diamino, ortho/para disubstituted phenolate proligands H(NNO(R)) with various phenolate substituents was synthesized and used to prepare indium dichloride complexes (NNO(R))InCl2via salt metathesis of the deprotonated ligands with indium trichloride. These complexes are dinuclear in the solid state, in contrast to previously reported complexes with t-butyl or methyl phenolate substituents. Solution state (1)H and PGSE NMR spectroscopy suggests that a fast exchange between the monomeric and dimeric forms of these complexes may exist in solution and is likely influenced by the chirality of the complexes undergoing aggregation. The indium dichloride complexes were utilized to synthesize dinuclear indium ethoxide complexes via salt metathesis with sodium ethoxide. These complexes were active for the polymerization of lactide. In situ and bulk polymerization data confirmed differences in the activity and selectivity of these systems based on the phenolate substituents as well as the ligand chirality.

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Citations

Feb 26, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·P McKeownM D Jones
Jul 21, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·I YuP Mehrkhodavandi
May 18, 2016·Inorganic Chemistry·Alexandre B KremerParisa Mehrkhodavandi
Aug 12, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·Sarah M KirkMatthew D Jones
Sep 1, 2016·Inorganic Chemistry·Tannaz EbrahimiParisa Mehrkhodavandi
Jan 20, 2017·Inorganic Chemistry·Alexandre B KremerParisa Mehrkhodavandi
Mar 31, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Paul McKeownMatthew D Jones
May 11, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·L-E ChileP Mehrkhodavandi
Apr 25, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Yu PanGaohong He
May 26, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Jean-Marie E P ColsRuaraidh D McIntosh
Apr 22, 2020·Chemical Science·Chatura GoonesingheParisa Mehrkhodavandi
Apr 1, 2020·Inorganic Chemistry·Shazia SoobratteeParisa Mehrkhodavandi
Nov 1, 2017·Accounts of Chemical Research·Kimberly M Osten, Parisa Mehrkhodavandi

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