An effective lactic acid-modified Hβ zeolite for synthesis of bis(indolyl)methanes

An effective lactic acid-modified Hβ zeolite for synthesis of bis(indolyl)methanes Excellent activity and stability have been observed for a lactic acid-modified Hβ (LA-Hβ) zeolite in the synthesis of bis(indolyl)methanes by Friedel–Crafts alkylation of indole with aldehydes. It is proposed that lactic acid treatment is appropriate for dealumination of Hβ zeolite, and results in a LA-Hβ zeolite with greater surface area, fewer weak acid sites, and more moderately-strong acid sites, as confirmed by the Brunauer–Emmett–Teller method, inductively coupled plasma emission spectrometry, and temperature-programmed desorption of NH3. Moreover, both electronic and steric effects of substituents on the aromatic ring of the aldehydes were found to be important in this reaction. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

An effective lactic acid-modified Hβ zeolite for synthesis of bis(indolyl)methanes

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Publisher
Springer Netherlands
Copyright
Copyright © 2012 by Springer Science+Business Media B.V.
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-012-0567-0
Publisher site
See Article on Publisher Site

Abstract

Excellent activity and stability have been observed for a lactic acid-modified Hβ (LA-Hβ) zeolite in the synthesis of bis(indolyl)methanes by Friedel–Crafts alkylation of indole with aldehydes. It is proposed that lactic acid treatment is appropriate for dealumination of Hβ zeolite, and results in a LA-Hβ zeolite with greater surface area, fewer weak acid sites, and more moderately-strong acid sites, as confirmed by the Brunauer–Emmett–Teller method, inductively coupled plasma emission spectrometry, and temperature-programmed desorption of NH3. Moreover, both electronic and steric effects of substituents on the aromatic ring of the aldehydes were found to be important in this reaction.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: May 11, 2012

References

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