Deuterium tracer studies of the mechanism of homogeneous catalytic hydrogenation of sorbic acid with pentacyanocobaltate II

1965 ◽  
Vol 42 (5) ◽  
pp. 432-434 ◽  
Author(s):  
A. F. Mabrouk ◽  
E. Selke ◽  
W. K. Rohwedder ◽  
H. J. Dutton
Keyword(s):  
Catalytic Hydrogenation ◽  
Sorbic Acid ◽  
Tracer Studies

Stereoselective catalytic hydrogenation of sorbic acid and sorbic alcohol with new Cp*Ru complexes

2000 ◽  
pp. 217-218 ◽  
Author(s):  
Stephan Steines ◽  
Birgit Drießen-Hölscher ◽  
Ulli Englert
Keyword(s):  
Catalytic Hydrogenation ◽  
Sorbic Acid ◽  
Ru Complexes

scholarly journals Catalytic Hydrogenation of Sorbic Acid using Pyrazolyl Palladium(II) and Nickel(II) Complexes as Precatalysts

2021 ◽  
Vol 74 ◽  
Author(s):  
Oluwasegun E. Olaoye ◽  
Olayinka Oyetunji ◽  
Banothile C.E. Makhubela ◽  
Apollinaire Muyaneza ◽  
Gopendra Kumar ◽  
...  
Keyword(s):  
Catalytic Hydrogenation ◽  
Sorbic Acid ◽  
Nickel Complexes ◽  
Experimental Conditions ◽  
Acid Proceeds ◽  
Hydrogenation Selectivity

ABSTRACT We have prepared several pyrazolyl palladium and nickel complexes ([(L1)PdCl2](1), [(L2) PdCl2](2), [(L3) PdCl2](3), [(L1) NiBr2](4), [(L2) NiBr2](5) and [(L3) NiBr2](6)) by reacting 3,5-dimethyMH-pyrazole (L1), 3,5-di-ferf-butyl-1ZÏ-pyrazole (L2) and 5-ferrocenyl-1Zf-pyrazole(L3) with [PdCl2(NCMe)2] or [NiBr2(DME)] to afford mononuclear palladium and nickel complexes, respectively. These complexes were then investigated as pre-catalysts in the hydrogenation of 2,4-hexadienoic acid (sorbic acid). The active catalysts from these complexes demonstrate significant activities under mild experimental conditions. Additionally, the active catalysts show that the hydrogenation of sorbic acid proceeds in a sequential manner, where the less hindered C=C bond (4-hexenoic acid) is preferentially reduced over the more hindered C=C bond (2-hexenoic acid). Keywords: Pyrazolyl catalysts, sorbic acid, hydrogenation, selectivity.

ChemInform Abstract: Stereoselective Catalytic Hydrogenation of Sorbic Acid and Sorbic Alcohol with New Cp*Ru Complexes.

ChemInform ◽  
2010 ◽  
Vol 31 (19) ◽  
pp. no-no
Author(s):  
Stephan Steines ◽  
Ulli Englert ◽  
Birgit Driessen-Hoelscher
Keyword(s):  
Catalytic Hydrogenation ◽  
Sorbic Acid ◽  
Ru Complexes

Homogeneous catalytic hydrogenation of sorbic acid with pentacyanocobaltate II

1964 ◽  
Vol 41 (2) ◽  
pp. 153-158 ◽  
Author(s):  
A. F. Mabrouk ◽  
H. J. Dutton ◽  
J. C. Cowan
Keyword(s):  
Catalytic Hydrogenation ◽  
Sorbic Acid

Nanometer Scale Spectroscopic Visualization of Catalytic Sites During a Hydrogenation Reaction on a Pd/Au Bimetallic Catalyst

2020 ◽  
Author(s):  
hao yin ◽  
Liqing Zheng ◽  
Wei Fang ◽  
Yin-Hung Lai ◽  
Nikolaus Porenta ◽  
...  
Keyword(s):  
Catalytic Hydrogenation ◽  
Density Functional ◽  
Hydrogen Transfer ◽  
Bimetallic Catalyst ◽  
Local Environment ◽  
Hydrogenation Reaction ◽  
Boundary Density ◽  
Catalytic Sites ◽  
Powerful Analytical Tool ◽  
Tip Enhanced Raman Spectroscopy

<p>Understanding the mechanism of catalytic hydrogenation at the local environment requires chemical and topographic information involving catalytic sites, active hydrogen species and their spatial distribution. Here, tip-enhanced Raman spectroscopy (TERS) was employed to study the catalytic hydrogenation of chloro-nitrobenzenethiol on a well-defined Pd(sub-monolayer)/Au(111) bimetallic catalyst (<i>p</i><sub>H2</sub>=1.5 bar, 298 K), where the surface topography and chemical fingerprint information were simultaneously mapped with nanoscale resolution (≈10 nm). TERS imaging of the surface after catalytic hydrogenation confirms that the reaction occurs beyond the location of Pd sites. The results demonstrate that hydrogen spillover accelerates hydrogenation at the Au sites within 20 nm from the bimetallic Pd/Au boundary. Density functional theory was used to elucidate the thermodynamics of interfacial hydrogen transfer. We demonstrate that TERS as a powerful analytical tool provides a unique approach to spatially investigate the local structure-reactivity relationship in catalysis.</p>

Nanometer Scale Spectroscopic Visualization of Catalytic Sites During a Hydrogenation Reaction on a Pd/Au Bimetallic Catalyst

2020 ◽  
Author(s):  
Hao Yin ◽  
Liqing Zheng ◽  
Wei Fang ◽  
Yin-Hung Lai ◽  
Nikolaus Porenta ◽  
...  
Keyword(s):  
Catalytic Hydrogenation ◽  
Density Functional ◽  
Hydrogen Transfer ◽  
Bimetallic Catalyst ◽  
Local Environment ◽  
Hydrogenation Reaction ◽  
Boundary Density ◽  
Catalytic Sites ◽  
Powerful Analytical Tool ◽  
Tip Enhanced Raman Spectroscopy

<p>Understanding the mechanism of catalytic hydrogenation at the local environment requires chemical and topographic information involving catalytic sites, active hydrogen species and their spatial distribution. Here, tip-enhanced Raman spectroscopy (TERS) was employed to study the catalytic hydrogenation of chloro-nitrobenzenethiol on a well-defined Pd(sub-monolayer)/Au(111) bimetallic catalyst (<i>p</i><sub>H2</sub>=1.5 bar, 298 K), where the surface topography and chemical fingerprint information were simultaneously mapped with nanoscale resolution (≈10 nm). TERS imaging of the surface after catalytic hydrogenation confirms that the reaction occurs beyond the location of Pd sites. The results demonstrate that hydrogen spillover accelerates hydrogenation at the Au sites within 20 nm from the bimetallic Pd/Au boundary. Density functional theory was used to elucidate the thermodynamics of interfacial hydrogen transfer. We demonstrate that TERS as a powerful analytical tool provides a unique approach to spatially investigate the local structure-reactivity relationship in catalysis.</p>

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