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Title: Ring opening polymerization of lactides and lactones by multimetallic alkyl zinc complexes derived from the acids Ph2C(X)CO2H (X = OH, NH2).
Authors: Al-Khafaji, Yahya
Elsegood, Mark R.J.
Frese, Josef W.A.
Redshaw, Carl
Issue Date: 2017
Publisher: © The Authors. Published by the Royal Society of Chemistry.
Citation: AL-KHAFAJI, Y. ...et al., 2017. Ring opening polymerization of lactides and lactones by multimetallic alkyl zinc complexes derived from the acids Ph2C(X)CO2H (X = OH, NH2). RSC Advances, 7(8), pp. 4510-4517.
Abstract: The reaction of the dialkylzinc reagents R2Zn with the acids 2,2-Ph2C(X)(CO2H), where X ¼ NH2, OH, i.e. 2,20-diphenylglycine (dpgH) or benzilic acid (benzH2), in toluene at reflux temperature afforded the tetranuclear ring complexes [RZn(dpg)]4, where R ¼ Me (1), Et (2), 2-CF3C6H4 (3), and 2,4,6-F3C6H2 (4); complex 2 has been previously reported. The crystal structures of 1$(2MeCN), 3 and 4$(4(C7H8)$ 1.59(H2O)) are reported, along with that of the intermediate compound (2-CF3C6H4)3B$MeCN and the known compound [ZnCl2(NCMe)2]. Complexes 1–4, together with the known complex [(ZnEt)3(ZnL)3(benz)3] (5; L ¼ MeCN), have been screened, in the absence of benzyl alcohol, for their potential to act as catalysts for the ring opening polymerization (ROP) of 3-caprolactone (3-CL), dvalerolactone (d-VL) and rac-lactide (rac-LA); the co-polymerization of 3-CL with rac-LA was also studied. Complexes 3 and 4 bearing fluorinated aryls at zinc were found to afford the highest activities.
Description: This is an Open Access Article. It is published by Royal Society of Chemistry under the Creative Commons Attribution 3.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/3.0/
Version: Published
DOI: 10.1039/c6ra26746g
URI: https://dspace.lboro.ac.uk/2134/23858
Publisher Link: http://dx.doi.org/10.1039/c6ra26746g
ISSN: 2046-2069
Appears in Collections:Published Articles (Chemistry)

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