Coadsorption of methyl pyruvate and (±)-1-(1-naphthyl)ethylamine on Pt(111): insights on the mechanism for asymmetric hydrogenation
The results of a series of adsorption and coadsorption measurements using (±)-1-(1-naphthyl)ethylamine (NEA), methyl pyruvate, ester-deuterated methyl pyruvate, methyl naphthalene and 2,3-butanedione on Pt(111) are presented. Coadsorption of NEA stabilizes a molecularly adsorbed state of methyl pyru...
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Veröffentlicht in: | Catalysis letters 2004-09, Vol.97 (3-4), p.111-114 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The results of a series of adsorption and coadsorption measurements using (±)-1-(1-naphthyl)ethylamine (NEA), methyl pyruvate, ester-deuterated methyl pyruvate, methyl naphthalene and 2,3-butanedione on Pt(111) are presented. Coadsorption of NEA stabilizes a molecularly adsorbed state of methyl pyruvate. The latter state undergoes thermal decomposition to yield a methane desorption peak centred at 320 K. Experiments performed using ester-deuterated methyl pyruvate show that the methane desorption results from the decomposition of the acetyl moiety of the α-ketoester. A stabilizing interaction is not observed for coadsorbed methyl naphthalene and methyl pyruvate, presumably due to the absence of an amine group. The study provides further evidence for the existence of a 1:1 methyl pyruvate-1-(1-naphthyl)ethylamine docking complex on Pt(111) under ultrahigh vacuum conditions. |
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ISSN: | 1011-372X 1572-879X |
DOI: | 10.1023/B:CATL.0000038570.82354.f6 |