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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.
|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/|
|Publisher Link: ||http://dx.doi.org/10.1039/c6ra26746g|
|Appears in Collections:||Published Articles (Chemistry)|
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