Sonochemical enantioselective hydrogenation of ethyl pyruvate over platinum catalysts

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Chiral sonochemical hydrogenation of an aliphatic α-ketoester, ethyl pyruvate to ethyl lactate was carried out over various platinum catalysts in different solvents under atmospheric hydrogen pressure. The reaction rates and the enantiomeric excesses were determined over Pt/C, Pt/SiO2 and Pt/K-10 catalysts both under conventional and sonochemical conditions. The effect of ultrasounds on the catalytic activity and enantioselectivity was tested applying sonochemical pretreatment before the reaction The ultrasonic irradiation was found to be highly advantageous in these hydrogenations. After insonation of the catalysts the enantioselectivity was highly improved over Pt/SiO2 and Pt/K-10 catalysts. In addition, the reactions took place in quantitative yield and with complete chemoselectivity and the hydrogenation rates increased with one order of magnitude despite the very mild (atmospheric hydrogen pressure, room temperature) experimental conditions.

Original languageEnglish
Pages (from-to)301-304
Number of pages4
JournalUltrasonics Sonochemistry
Volume4
Issue number4
Publication statusPublished - 1997

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pyruvates
Hydrogenation
Platinum
hydrogenation
platinum
Atmospheric Pressure
catalysts
Catalysts
Enantioselectivity
Hydrogen
Ultrasonics
lactates
hydrogen
pretreatment
Reaction rates
catalytic activity
Catalyst activity
reaction kinetics
Temperature
ultrasonics

Keywords

  • Enantioselectivity
  • Hydrogenation
  • Ketoester
  • Platinum catalysts
  • Ultrasound

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Acoustics and Ultrasonics

Cite this

Sonochemical enantioselective hydrogenation of ethyl pyruvate over platinum catalysts. / Török, Béla; Felföldi, K.; Szakonyi, G.; Bartók, M.

In: Ultrasonics Sonochemistry, Vol. 4, No. 4, 1997, p. 301-304.

Research output: Contribution to journalArticle

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AU - Szakonyi, G.

AU - Bartók, M.

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