Epoxidation of olefins using a novel synthesized tungsten dendritic catalyst

Author(s)

Vieira, Eduardo G. ^[1] ; Dias Filho, Newton L. ^{[1, 2]}

Affiliation

^[1] Univ Estadual Paulista, UNESP, Dept Fis & Quim, Av Brasil 56 Ctr, Caixa Postal 31, BR-15385000 Ilha Solteira, SP - Brazil

^[2] Univ Extremo Catarinense, Av Univ 1105, CP 3167, BR-88806000 Criciuma, SC - Brazil

• Document type: Journal article
• Source: Materials Chemistry and Physics; v. 201, p. 262-270, NOV 1 2017.
• Web of Science Citations: 2

Abstract

In this work, we carry out the preparation and characterization of new dendritic catalyst from an oligomer polyhedral silsesquioxane core (POSS-DG2.0). This material was used in the immobilization of the {[}W(CO)(3)Br-2(NCMe)(2)] complex for optimization of the synthesis of the new dendritic catalyst. To determine the reaction time, the temperature effect and the amount of groups anchored in the material (mmol), some parameters, such as equilibration time and adsorption isotherms were studied. After the optimization studies and with the intention of application in catalysis, the new catalytic macromolecule was prepared by reaction of the dendrimer with the organometallic complex. The new catalyst was characterized by elemental analysis, FTIR, C-13 and Si-29 NMR, SEM, EDS, DRX and TGA. The new catalytic macromolecule POSS-DG2.0-{[}W(CO)(3)Br-2] was tested in the epoxidation of olefins and proved to be an active catalyst with conversion rates between 60 and 88% and high selectivity in the formation of epoxides. To the best of our knowledge, this study is the first that has reported the preparation of POSS-DG2.0-{[}W(CO)(3)Br-2] for catalytic epoxidation of 1-octene, cyclooctene, (S)-limonene, cis-3-hexen-1-ol, trans-3-hexen-1-ol and styrene. (C) 2017 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 14/05566-5 - Study of the reactions of immobilization of tungsten and molybdenum organometallic complexes on the polyhedral oligomeric silsesquioxanes for application in catalysis
• Grantee: Eduardo Guimarães Vieira
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 13/24602-0 - Synthesis and characterization of polyhedral oligomeric silsesquioxanes and their applications in process of adsorption and catalysis
• Grantee: Newton Luiz Dias Filho
• Support Opportunities: Regular Research Grants