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Comparative hydroamination of aniline and substituted anilines with styrene on different zeolites, triflate based catalysts and their physical mixtures

Paper ID Volume ID Publish Year Pages File Format Full-Text
39944 45840 2014 6 PDF Available
Title
Comparative hydroamination of aniline and substituted anilines with styrene on different zeolites, triflate based catalysts and their physical mixtures
Abstract

•Hydroamination of aniline and substituted anilines with styrene.•An enhanced activity and selectivity provided by physical mixtures.•Reports on effect of ultrasounds irradiation on the preparation of physical mixtures.•A control of the selectivity by the type of catalyst's acidity and the substrate.

Catalytic performances of different zeolites (Beta and mordenites), scandium triflate based catalysts, mesoporous UVM-7 encapsulated scandium triflate and physical mixtures prepared under ultrasound irradiation were evaluated in the hydroamination of aniline and substituted anilines with styrene. The performances of these catalysts were controlled by the type of acidity and strength. Thus, the conversion was mainly controlled by the strength of the acid sites and their accessibility, while the selectivity appeared to be controlled by the Lewis/Brønsted type of acidity. Lewis acid catalysts directed the reactions mainly to the formation of the Markovnikov adducts while Brønsted acid catalysts to anti-Markovnikov. Zeolites and scandium triflate led to results very close to those reported in the literature. Among different physical mixtures those of scandium triflate with the mesoporous scandium triflate embedded in a UVM-7 structure provided better conversions with a good selectivity in the Markovnikov adduct. These results were attributed to a better dispersion of scandium triflate during the preparation of physical mixtures.

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Keywords
Hydroamination; Aniline; Substituted anilines; Styrene; Lewis/Brønsted catalysts; Physical mixtures
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Comparative hydroamination of aniline and substituted anilines with styrene on different zeolites, triflate based catalysts and their physical mixtures
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 474, 22 March 2014, Pages 230–235
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
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