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Ring opening polymerization of lactides and lactones by multimetallic alkyl zinc complexes derived from the acids Ph2C(X)CO2H (X = OH, NH2).
journal contribution
posted on 2017-01-25, 10:56 authored by Yahya Al-Khafaji, Mark ElsegoodMark Elsegood, Josef W.A. Frese, Carl RedshawThe 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.
History
School
- Science
Department
- Chemistry
Published in
RSC AdvancesCitation
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.Publisher
© The Authors. Published by the Royal Society of Chemistry.Version
- VoR (Version of Record)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution 3.0 Unported (CC BY 3.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/by/3.0/Acceptance date
2016-12-19Publication date
2017Notes
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/ISSN
2046-2069Publisher version
Language
- en