Homogeneous and heterogeneous asymmetric reactions. Part 13*. Clay-supported noble metal catalysts in enantioselective hydrogenations

Béla Török, K. Balázsik, István Kun, G. Szöllősi, G. Szakonyi, M. Bartók

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17 Citations (Scopus)

Abstract

The preparation, characterization and application of new clay-supported Pt and Pd catalysts containing cinchonidine as chiral modifier are described. The preparation was carried out by deposition of the metal by impregnation followed by the immobilization of the modifier. The catalysts were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The samples were tested in enantioselective hydrogenation of ethyl pyruvate and 2-methyl-2-pentenoic acid. The catalysts were found to be active in the hydrogenations producing moderate to good enantioselectivities (up to 56% ee for the (R)-ethyl lactate). Moreover, the Pt catalysts were found to be recyclable. The immobilization of modifier on clay-supported catalysts led us to draw important conclusions concerning the existing mechanistic explanations.

Original languageEnglish
Pages (from-to)515-522
Number of pages8
JournalStudies in Surface Science and Catalysis
Volume125
Publication statusPublished - 1999

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Precious metals
noble metals
clays
Hydrogenation
hydrogenation
Clay
catalysts
Catalysts
immobilization
Enantioselectivity
pyruvates
preparation
lactates
Catalyst supports
Impregnation
Metals
Transmission electron microscopy
X ray diffraction
Acids
clay

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Catalysis

Cite this

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abstract = "The preparation, characterization and application of new clay-supported Pt and Pd catalysts containing cinchonidine as chiral modifier are described. The preparation was carried out by deposition of the metal by impregnation followed by the immobilization of the modifier. The catalysts were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The samples were tested in enantioselective hydrogenation of ethyl pyruvate and 2-methyl-2-pentenoic acid. The catalysts were found to be active in the hydrogenations producing moderate to good enantioselectivities (up to 56{\%} ee for the (R)-ethyl lactate). Moreover, the Pt catalysts were found to be recyclable. The immobilization of modifier on clay-supported catalysts led us to draw important conclusions concerning the existing mechanistic explanations.",
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T1 - Homogeneous and heterogeneous asymmetric reactions. Part 13*. Clay-supported noble metal catalysts in enantioselective hydrogenations

AU - Török, Béla

AU - Balázsik, K.

AU - Kun, István

AU - Szöllősi, G.

AU - Szakonyi, G.

AU - Bartók, M.

PY - 1999

Y1 - 1999

N2 - The preparation, characterization and application of new clay-supported Pt and Pd catalysts containing cinchonidine as chiral modifier are described. The preparation was carried out by deposition of the metal by impregnation followed by the immobilization of the modifier. The catalysts were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The samples were tested in enantioselective hydrogenation of ethyl pyruvate and 2-methyl-2-pentenoic acid. The catalysts were found to be active in the hydrogenations producing moderate to good enantioselectivities (up to 56% ee for the (R)-ethyl lactate). Moreover, the Pt catalysts were found to be recyclable. The immobilization of modifier on clay-supported catalysts led us to draw important conclusions concerning the existing mechanistic explanations.

AB - The preparation, characterization and application of new clay-supported Pt and Pd catalysts containing cinchonidine as chiral modifier are described. The preparation was carried out by deposition of the metal by impregnation followed by the immobilization of the modifier. The catalysts were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The samples were tested in enantioselective hydrogenation of ethyl pyruvate and 2-methyl-2-pentenoic acid. The catalysts were found to be active in the hydrogenations producing moderate to good enantioselectivities (up to 56% ee for the (R)-ethyl lactate). Moreover, the Pt catalysts were found to be recyclable. The immobilization of modifier on clay-supported catalysts led us to draw important conclusions concerning the existing mechanistic explanations.

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