Enantiodifferentiation in asymmetric sonochemical hydrogenations

Béla Török; Károly Felföldi; Gerda Szakonyi; Katalin Balázsik; Mihály Bartók

doi:10.1023/a:1019098731600

Enantiodifferentiation in asymmetric sonochemical hydrogenations

Béla Török
, Károly Felföldi
, Gerda Szakonyi
, Katalin Balázsik
, Mihály Bartók

Chemistry

Hungarian Academy of Sciences
University of Szeged

Research output: Contribution to journal › Article › peer-review

Abstract

The effect of sonochemical pretreatment on the enantioselectivity of Pt/Al₂O₃-cinchonidine-catalyzed ethyl pyruvate hydrogenation was studied at different hydrogen pressures in various solvents, mainly in acetic acid. The sonochemical pretreatment of a commercial Pt/Al₂O₃-cinchonidine catalytic system in acetic acid resulted in enhanced enantioselectivity providing excellent ee values (97 % ee ) under mild and widely varied experimental conditions. Moreover, the application of ultrasonics provides a possibility of the catalyst recycling without regeneration. The catalyst was tested by transmission electron microscopy to determine the effect of the sonication on the metal particle size morphology.

Original language	English
Pages (from-to)	81-84
Number of pages	4
Journal	Catalysis Letters
Volume	52
Issue number	1
DOIs	https://doi.org/10.1023/a:1019098731600
State	Published - 1998

ASJC Scopus Subject Areas

Catalysis
General Chemistry

Keywords

Cinchonidine
Enantioselective
Ethyl pyruvate
Hydrogenation
Particle size distribution
Pt/AlO
Ultrasounds

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10.1023/a:1019098731600

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abstract = "The effect of sonochemical pretreatment on the enantioselectivity of Pt/Al2O3-cinchonidine-catalyzed ethyl pyruvate hydrogenation was studied at different hydrogen pressures in various solvents, mainly in acetic acid. The sonochemical pretreatment of a commercial Pt/Al2O3-cinchonidine catalytic system in acetic acid resulted in enhanced enantioselectivity providing excellent ee values (97 \% ee ) under mild and widely varied experimental conditions. Moreover, the application of ultrasonics provides a possibility of the catalyst recycling without regeneration. The catalyst was tested by transmission electron microscopy to determine the effect of the sonication on the metal particle size morphology.",

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AU - Török, Béla

AU - Felföldi, Károly

AU - Szakonyi, Gerda

AU - Balázsik, Katalin

AU - Bartók, Mihály

PY - 1998

Y1 - 1998

N2 - The effect of sonochemical pretreatment on the enantioselectivity of Pt/Al2O3-cinchonidine-catalyzed ethyl pyruvate hydrogenation was studied at different hydrogen pressures in various solvents, mainly in acetic acid. The sonochemical pretreatment of a commercial Pt/Al2O3-cinchonidine catalytic system in acetic acid resulted in enhanced enantioselectivity providing excellent ee values (97 % ee ) under mild and widely varied experimental conditions. Moreover, the application of ultrasonics provides a possibility of the catalyst recycling without regeneration. The catalyst was tested by transmission electron microscopy to determine the effect of the sonication on the metal particle size morphology.

AB - The effect of sonochemical pretreatment on the enantioselectivity of Pt/Al2O3-cinchonidine-catalyzed ethyl pyruvate hydrogenation was studied at different hydrogen pressures in various solvents, mainly in acetic acid. The sonochemical pretreatment of a commercial Pt/Al2O3-cinchonidine catalytic system in acetic acid resulted in enhanced enantioselectivity providing excellent ee values (97 % ee ) under mild and widely varied experimental conditions. Moreover, the application of ultrasonics provides a possibility of the catalyst recycling without regeneration. The catalyst was tested by transmission electron microscopy to determine the effect of the sonication on the metal particle size morphology.

KW - Cinchonidine

KW - Enantioselective

KW - Ethyl pyruvate

KW - Hydrogenation

KW - Particle size distribution

KW - Pt/AlO

KW - Ultrasounds

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Enantiodifferentiation in asymmetric sonochemical hydrogenations

Abstract

ASJC Scopus Subject Areas

Keywords

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