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Issue 6, 2016
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Vanadium(v) phenolate complexes for ring opening homo- and co-polymerisation of ε-caprolactone, l-lactide and rac-lactide

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Abstract

The vanadyl complexes [VO(OtBu)L1] (1) and {[VO(OiPr)]2(μ-p-L2p)} (2) {[VO(OR)]2(μ-p-L2m)} (R = iPr 3, tBu 4) have been prepared from [VO(OR)3] (R = nPr, iPr or tBu) and the respective phenol, namely 2,2′-ethylidenebis(4,6-di-tert-butylphenol) (L1H2) or α,α,α′,α′-tetra(3,5-di-tert-butyl-2-hydroxyphenyl–p/m-)xylene-para-tetraphenol (L2p/mH4). For comparative studies, the known complexes [VO(μ-OnPr)L1]2 (I), [VOL3]2 (II) (L3H3 = 2,6-bis(3,5-di-tert-butyl-2-hydroxybenzyl)-4-tert-butylphenol) were prepared. An imido complex {[VCl(Np-tolyl)(NCMe)]2(μ-p-L2p)} (5) has been prepared following work-up from [V(Np-tolyl)Cl3], L2pH4 and Et3N. The molecular structures of complexes 1–5 are reported. Complexes 1–5 and I and II have been screened for their ability to ring open polymerise ε-caprolactone, L-lactide or rac-lactide with and without solvent present. The co-polymerization of ε-caprolactone with L-lactide or rac-lactide afforded co-polymers with low lactide content; the reverse addition was ineffective.

Graphical abstract: Vanadium(v) phenolate complexes for ring opening homo- and co-polymerisation of ε-caprolactone, l-lactide and rac-lactide

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Supplementary files

Article information


Submitted
23 Nov 2015
Accepted
17 Dec 2015
First published
22 Dec 2015

This article is Open Access

RSC Adv., 2016,6, 4792-4802
Article type
Paper
Author version available

Vanadium(V) phenolate complexes for ring opening homo- and co-polymerisation of ε-caprolactone, L-lactide and rac-lactide

F. Ge, Y. Dan, Y. Al-Khafaji, T. J. Prior, L. Jiang, M. R. J. Elsegood and C. Redshaw, RSC Adv., 2016, 6, 4792
DOI: 10.1039/C5RA24816G

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