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Heterolepic ?-Ketoiminate Zinc Phenoxide Complexes as Efficient Catalysts for the Ring Opening Polymerization of Lactide.

ABSTRACT: Zinc phenoxide complexes L1ZnOAr 1-4 (L1=Me2NC2H4NC(Me)CHC(Me)O) and L2ZnOAr 5-8 (L2=Me2NC3H6NC(Me)CHC(Me)O) with donor-functionalized ?-ketoiminate ligands (L1/2) and OAr substituents (Ar=Ph 1, 5; 2,6-Me2-C6H3 2, 6; 3,5-Me2-C6H3 3, 7; 4-Bu-C6H4 4, 8) with tuneable electronic and steric properties were synthesized and characterized. 1-8 adopt binuclear structures in the solid state except for 5, while they are monomeric in CDCl3 solution. 1-8 are active catalysts for the ring opening polymerization (ROP) of lactide (LA) in CH2Cl2 at ambient temperature and the catalytic activity is controlled by the electronic and steric properties of the OAr substituent, yielding polymers with high average molecular weight (M n) and moderately controlled molecular weight distribution (MWDs). 1 and 5 showed a living polymerization character and kinetic studies on the ROP of L-LA with 1 and 5 proved first order dependencies on the monomer concentration. Homonuclear decoupled 1H-NMR analyses of polylactic acid (PLA) formed with rac-LA proved isotactic enrichment of the PLA microstructure.

SUBMITTER: Ghosh S 

PROVIDER: S-EPMC6625107 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature

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Heterolepic <i>β</i>-Ketoiminate Zinc Phenoxide Complexes as Efficient Catalysts for the Ring Opening Polymerization of Lactide.

Ghosh Swarup S   Schäfer Pascal M PM   Dittrich Dennis D   Scheiper Christoph C   Steiniger Phillip P   Fink Gerhard G   Ksiazkiewicz Agnieszka N AN   Tjaberings Alexander A   Wölper Christoph C   Gröschel André H AH   Pich Andrij A   Herres-Pawlis Sonja S   Schulz Stephan S  

ChemistryOpen 20190704 7

Zinc phenoxide complexes L<sup>1</sup>ZnOAr <b>1</b>-<b>4</b> (L<sup>1</sup>=Me<sub>2</sub>NC<sub>2</sub>H<sub>4</sub>NC(Me)CHC(Me)O) and L<sup>2</sup>ZnOAr <b>5</b>-<b>8</b> (L<sup>2</sup>=Me<sub>2</sub>NC<sub>3</sub>H<sub>6</sub>NC(Me)CHC(Me)O) with donor-functionalized <i>β</i>-ketoiminate ligands (L<sup>1/2</sup>) and OAr substituents (Ar=Ph <b>1</b>, <b>5</b>; 2,6-Me<sub>2</sub>-C<sub>6</sub>H<sub>3</sub> <b>2</b>, <b>6</b>; 3,5-Me<sub>2</sub>-C<sub>6</sub>H<sub>3</sub> <b>3</b>, <b>7</b>;  ...[more]

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