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Controlled lactide polymerization using diimine magnesium complex: synthesis of high-molecular-weight polylactide and evaluation of its cytotoxicity in vitro

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Abstract

A mechanism of ring-opening polymerization of lactide in a solution using a magnesium coordination compound (dpp-bian)Mg(thf)3 (1) containing a chelating redox-active acenaphthenediimine ligand dpp-bian (1,2-bis-[(2,6- diisopropyl)phenylimino]acenaphthene) has been proposed. The reaction proceeds in the presence of a chain initiator/regulator ROH (R = H, alkyl, acyl), while the true polymerization catalyst is presumably the product of the interaction of complex 1, lactide, and ROH. It has been demonstrated that a decrease in the content of the initiating impurity in the initial monomer by precise purification of the latter makes it possible to control the molecular weight of polymer in order to obtain high molecular weight polylactide (Mw = 1.9 • 105, PDI 1.5). Due to non-toxic catalyst system, the resulting polymer shows no cytotoxicity, as confirmed by in vitro studies.

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Correspondence to A. G. Morozov.

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Dedicated to Academician of the Russian Academy of Sciences I. P. Beletskaya on the occasion of her anniversary.

The work was carried out within the framework of the “Priority 2030” program funded by the Ministry of Science and Higher Education of the Russian Federation, using the equipment of the Center for Collective Use “Analytical Center of G. A. Razuvaev Institute of Organometallic Chemistry of the Russian Academy of Sciences” with the support of the grant “Ensuring the development of the material and technical infrastructure of centers for the collective use of scientific equipment” (unique identifier RF 2296.61321X0017, agreement number 075-15-2021-670).

No human or animal subjects were used in this research.

The authors declare no competing interests.

Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, Vol. 72, No. 3, pp. 778–784, March, 2023.

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Morozov, A.G., Razborov, D.A., Aleynik, D.Y. et al. Controlled lactide polymerization using diimine magnesium complex: synthesis of high-molecular-weight polylactide and evaluation of its cytotoxicity in vitro. Russ Chem Bull 72, 778–784 (2023). https://doi.org/10.1007/s11172-023-3841-5

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  • DOI: https://doi.org/10.1007/s11172-023-3841-5

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