Abstract
W(VI)-based catalysts for epoxidation were incorporated into hydrotalcite either by anionic exchange or by complexation with phosphonic acids previously incorporated between the sheets. Phenyl- and dodecylphosphonic acids and peroxotungstic salts were intercalated into hydrotalcite as attested by the expansion of the lamellar lattice and the complexation of phosphonic acids with W-peroxo species was made possible when using a lipophilic quaternary ammonium peroxotungstic salt [W(VI)-Aliquat] which maintains the layered structure. These catalysts were checked in the epoxidation of cyclohexene with hydrogen peroxide or terbutylhydroperoxide as external oxidants. The materials prepared by anionic exchange gave only epoxycyclohexane but with moderate yields, whereas those prepared from previously incorporated phosphonic acids gave rather high selectivity (50–72%) in allylic oxidation products.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
