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Wells–Dawson heteropolyacid as reusable catalyst for sustainable synthesis of flavones

Paper ID Volume ID Publish Year Pages File Format Full-Text
41383 45887 2011 6 PDF Available
Title
Wells–Dawson heteropolyacid as reusable catalyst for sustainable synthesis of flavones
Abstract

The behavior of Wells–Dawson (H6P2W18O62·24H2O, WD) acid, both bulk and supported on silica, for the cyclodehydration reaction of 1-(2-hydroxyphenyl)-3-phenyl-1,3-propanedione to obtain flavone was studied in heterogeneous conditions, using toluene as solvent. Catalytic experiences with bulk and supported catalysts with different WD acid loadings and reuse of the catalysts were done. The catalytic activity of supported catalysts was higher than that of the bulk catalyst, and their activity was almost constant after three reaction cycles. The following reaction conditions: reflux toluene and 1% mmol of WD supported on silica (0.4 g WD acid by gram of silica) were used for the preparation of five flavones. Yields above 85% were obtained in 4–5 h.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (80 K)Download as PowerPoint slideHighlights► Wells–Dawson heteropolyacid as heterogeneous catalyst to obtain flavones. ► Supported catalyst was re-used three times without losing activity. ► Yields above 85% were obtained in 4–5 h.

Keywords
Acid catalysis; Heteropolyacids; Wells–Dawson; Flavones
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Wells–Dawson heteropolyacid as reusable catalyst for sustainable synthesis of flavones
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 404, Issues 1–2, 19 September 2011, Pages 68–73
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us