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Microwave-assisted Friedel–Crafts acylation of indole with acetic anhydride over tungstophosphoric acid modified Hβ zeolite

Paper ID Volume ID Publish Year Pages File Format Full-Text
49847 46769 2012 4 PDF Available
Title
Microwave-assisted Friedel–Crafts acylation of indole with acetic anhydride over tungstophosphoric acid modified Hβ zeolite
Abstract

Friedel–Crafts acylation of indole with acetic anhydride has been carried out over zeolites under microwave and conventional heating, respectively. A tungstophosphoric acid modified Hβ (PW-Hβ) zeolite showed better catalytic performance than parent Hβ zeolite due to its higher amount of strongly acidic sites and lower amount of Lewis acid sites, confirmed from NH3 temperature-programmed desorption (NH3-TPD) and Fourier Transform Infrared Spectrometer after adsorption of pyridine (Py-IR). Particularly, microwave radiation was found to make this transformation not only more efficient but also selective to 3-acetylindole compared with conventional heating. Furthermore, PW-Hβ has shown good stability in this reaction.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Friedel–Crafts acylation of indole with acetic anhydride was studied over zeolites. ► Microwave was believed to make this transformation more efficient and selective. ► Tungstophosphoric acid modified Hβ was proven to have good activity and stability. ► Synergistic effect of Hβ zeolite and WO3 accounts for the catalyst's high activity. ► A possible mechanism was proposed based on GC-MS results and previous literature.

Keywords
Microwave; Friedel–Crafts acylation; Zeolite; Acid modified; 3-Acetylindole
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Microwave-assisted Friedel–Crafts acylation of indole with acetic anhydride over tungstophosphoric acid modified Hβ zeolite
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 29, 5 December 2012, Pages 114–117
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