Publication Type Journal Article
Title Zinc biomimetic catalysts for epoxidation of olefins with H2O2
Authors Cristina I. Fernandes P. D. Vaz Teresa G. Nunes C. D. Nunes
Groups BIOMOL CE
Journal APPLIED CLAY SCIENCE
Year 2020
Month June
Volume 190
Number
Pages
Abstract A Zn complex was stepwise intercalated in a Mg/Al layered double hydroxide material (HT) holding phenylalanine in its interlayer spacing. The material was characterized by powder X-ray diffraction, FTIR and solid state C-13 NMR spectroscopy. By analogy, the [Zn(phe)(H2O)](NO3) complex bearing deprotonated phenylalanine (phe) amino acid as ligand and a labile water molecule, mimicking biological moieties, was also prepared as model and characterized by HR-MS, FTIR and H-1 solution NMR spectroscopy. Both the Zn-containing HT material and model complex were tested in the catalytic epoxidation of cyclooctene, styrene and 1-octene. All tests were carried out with hydrogen peroxide (H2O2) or tert-butylhydroperoxide (TBHP), leading selectively to epoxides in most cases. Both temperature and oxygen source were found to be key factors in controlling epoxide selectivity, especially when using H2O2, where results were outstanding. Furthermore, the reported results show that the catalytic performance of this Zn system is at the same level of similar systems, holding heavier metals and less sustainable, found in the literature, while the Zn-containing HT catalyst had also the advantage of recyclability.
DOI http://dx.doi.org/10.1016/j.clay.2020.105562
ISBN
Publisher
Book Title
ISSN 0169-1317
EISSN 1872-9053
Conference Name
Bibtex ID ISI:000529362000006
Observations
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