Direct STM evidence of a surface interaction between chiral modifier and pro-chiral reagent: methylacetoacetate on R,R-tartaric acid modified Ni{111}

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Abstract

The asymmetric hydrogenation of methylacetoacetate to R-methyl-3-hydroxybutyrate over R,R-tartaric acid modified Ni catalysts is a well known example of heterogeneous enantioselective catalysis. Using STM, RAIRS and TPD, we investigate the adsorption of methylacetoacetate on Ni{1 1 1} and R,R-TA modified Ni{1 1 1} in order to shed light on the molecular mechanisms underlying the enantioselective catalysis. We show that methylacetoacetate adsorption can only occur in regions of low R,R-tartaric acid coverage. Once adsorption occurs, methylacetoacetate is able to locally rearrange the tartrate modifiers to produce a two-dimensional co-crystal. We consider the implications of our work in explaining the mechanism of enantioselective hydrogenation in this type of system. (C) 2002 Elsevier Science B.V. All rights reserved.

Original languageEnglish
Pages (from-to)237-249
Number of pages13
JournalSurface Science
Volume519
Issue number3
DOIs
Publication statusPublished - 10 Nov 2002

Keywords

  • scanning tunneling microscopy
  • infrared absorption spectroscopy
  • catalysis
  • nickel
  • carboxylic acid
  • ENANTIOSELECTIVE HYDROGENATION
  • NICKEL-CATALYSTS
  • ADSORPTION

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