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Dinuclear iminophenoxide copper complexes in rac-lactide polymerisation

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Abstract

Dinuclear bis(R′-(R′′-iminomethyl)phenoxide) copper complexes L2Cu2(μ-OR)2 were prepared from the reaction of copper methoxide with ROH and LH (ROH = dimethylaminoethanol or pyridylmethanol, R′ = H, 4,6-tBu, 1,3-Cl, R′′ = benzyl, cyclohexyl, diphenylmethyl and 2,6-dimethylphenyl). Preparation was complicated by formation of homoleptic L2Cu and only 9 of the 24 possible combinations could be prepared. All complexes were characterized by single crystal X-ray diffraction studies and crystallized as dinuclear penta-coordinated complexes. Homoleptic complexes L2Cu were inactive in lactide polymerization at room temperature. Most heteroleptic complexes showed modest to good activities with full conversion in less than 6 h at room temperature. Complexes with R′ = H showed poor molecular weight control, complexes with R′ = Cl were inactive in polymerization. In pyridylmethoxide-containing complexes, only one alkoxide initiated chain growth. All complexes produced atactic polymer.

Graphical abstract: Dinuclear iminophenoxide copper complexes in rac-lactide polymerisation

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Publication details

The article was received on 25 May 2018, accepted on 04 Jul 2018 and first published on 06 Jul 2018


Article type: Paper
DOI: 10.1039/C8DT02140F
Citation: Dalton Trans., 2018, Advance Article
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    Dinuclear iminophenoxide copper complexes in rac-lactide polymerisation

    P. Daneshmand, L. Pinon and F. Schaper, Dalton Trans., 2018, Advance Article , DOI: 10.1039/C8DT02140F

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