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Title: Enhanced hydrogenation activity and diastereomeric interactions of methyl pyruvate co-adsorbed with R-1-(1-naphthyl)ethylamine on Pd(111)

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms12380· OSTI ID:1326641
 [1];  [1]; ORCiD logo [2];  [1];  [1];  [1]
  1. Univ. of Wisconsin-Milwaukee, Milwaukee, WI (United States)
  2. Univ. of Wisconsin-Milwaukee, Milwaukee, WI (United States); Univ. of Illinois at Urbana-Champaign, Champaign, IL (United States)

Unmodified racemic sites on heterogeneous chiral catalysts reduce their overall enantioselectivity, but this effect is mitigated in the Orito reaction (methyl pyruvate (MP) hydrogenation to methyl lactate) by an increased hydrogenation reactivity. Here, this effect is explored on a R-1-(1-naphthyl)ethylamine (NEA)-modified Pd(111) model catalyst where temperature-programmed desorption experiments reveal that NEA accelerates the rates of both MP hydrogenation and H/D exchange. NEAþMP docking complexes are imaged using scanning tunneling microscopy supplemented by density functional theory calculations to allow the most stable docking complexes to be identified. The results show that diastereomeric interactions between NEA and MP occur predominantly by binding of the C=C of the enol tautomer of MP to the surface, while simultaneously optimizing C=O...H2N hydrogen-bonding interactions. In conclusion, the combination of chiral-NEA driven diastereomeric docking with a tautomeric preference enhances the hydrogenation activity since C=C bonds hydrogenate more easily than C=O bonds thus providing a rationale for the catalytic observations.

Research Organization:
Univ. of Wisconsin, Milwaukee, WI (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
FG02-03ER15474; SC0008703
OSTI ID:
1326641
Journal Information:
Nature Communications, Vol. 7; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 30 works
Citation information provided by
Web of Science

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Cited By (4)

Surface‐Driven Keto–Enol Tautomerization: Atomistic Insights into Enol Formation and Stabilization Mechanisms journal December 2018
Surface‐Driven Keto–Enol Tautomerization: Atomistic Insights into Enol Formation and Stabilization Mechanisms journal December 2018
Local generation of hydrogen for enhanced photothermal therapy journal October 2018
Chirality in adsorption on solid surfaces journal January 2017

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