An infrared study of selective hydrogenation of carboxylic acids to corresponding aldehydes over a ZrO2 catalyst: pivalic acid to 2,2-dimethylpropanal

1993 ◽  
Vol 17 (3-4) ◽  
pp. 309-317 ◽  
Author(s):  
Nan Ding ◽  
Junko Kondo ◽  
Ken ichi Maruya ◽  
Kazunari Domen ◽  
Toshiharu Yokoyama ◽  
...  
Keyword(s):  
Carboxylic Acids ◽  
Selective Hydrogenation ◽  
Pivalic Acid ◽  
Infrared Study ◽  
Zro2 Catalyst

Chemoselective Hydrogenation of Cinnamaldehyde over Tailored Oxygen Vacancy Rich Pd@ZrO2 Catalyst

2021 ◽  
Author(s):  
Komal N. Patil ◽  
Divya Prasad ◽  
Jayesh T. Bhanushali ◽  
Bhalchandra Kakade ◽  
Arvind H. Jadhav ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Selective Hydrogenation ◽  
Oxygen Vacancies ◽  
Synthesis Method ◽  
Chemoselective Hydrogenation ◽  
Zro2 Catalyst ◽  
Industrial Relevance

Selective hydrogenation of cinnamaldehyde to hydrocinnamaldehyde is captivating due to its industrial relevance. Herein, two-step synthesis method was adopted to develop oxygen vacancies in Pd@ZrO2 catalysts. The oxygen vacancies were...

Pd(ii)/Zn co-catalyzed chemo-selective hydrogenation of α-methylene-γ-keto carboxylic acids

2019 ◽  
Vol 17 (8) ◽  
pp. 2174-2181 ◽  
Author(s):  
Xuexin Zhang ◽  
Yang Gao ◽  
Ronibala Devi Laishram ◽  
Kangkui Li ◽  
Yong Yang ◽  
...  
Keyword(s):  
Carboxylic Acids ◽  
Selective Hydrogenation

Divergent synthesis of α-methyl-γ-keto carboxylic acids, α-methylcarboxylic acids, and lactones from α-methylene-γ-keto carboxylic acids.

The reactivity of platinum hydrides in the selective hydrogenation of acetic acid over Pt-ReOx/TiO2 catalysts

2020 ◽  
Vol 20 (6) ◽  
pp. 426-432
Author(s):  
N. V. Makolkin ◽  
H. U. Kim ◽  
E. A. Paukshtis ◽  
J. Jae ◽  
B. S. Bal’zhinimaev
Keyword(s):  
Acetic Acid ◽  
Absorption Band ◽  
Electronic State ◽  
Carboxylic Acids ◽  
Selective Hydrogenation ◽  
High Reactivity ◽  
Absorption Bands ◽  
In Situ Drifts ◽  
High Frequencies

In situ DRIFTS was employed to investigate the reaction of hydrogen with supported subnanometer Pt-ReOx species that are active in the hydrogenation of carboxylic acids. Absorption bands of platinum hydrides in the region of 2025–2043 cm–1 were detected; high reactivity of the hydrides toward the adsorbed acetic acid was revealed. In the process, the absorption band of platinum hydride shifted to high frequencies and increased in intensity due to the influence of adjacent acetates on the electronic state of platinum. It was found that in a hydrogen medium the intensity of platinum hydride bands sharply increases after the adsorption of acetic acid and then gradually decreases owing to the reaction of the hydrides with surface acetates.

Infrared study of alkyl carboxylic acids in CCl4 and/or CHCl3 solutions

1994 ◽  
Vol 7 (3) ◽  
pp. 275-286 ◽  
Author(s):  
R.A. Nyquist ◽  
T.D. Clark ◽  
R. Streck
Keyword(s):  
Carboxylic Acids ◽  
Infrared Study

Lewis Acid Promoted Ruthenium(II)-Catalyzed Etherifications by Selective Hydrogenation of Carboxylic Acids/Esters

2015 ◽  
Vol 127 (17) ◽  
pp. 5285-5289 ◽  
Author(s):  
Yuehui Li ◽  
Christoph Topf ◽  
Xinjiang Cui ◽  
Kathrin Junge ◽  
Matthias Beller
Keyword(s):  
Carboxylic Acids ◽  
Lewis Acid ◽  
Selective Hydrogenation

The nature of active sites in Pt–ReO X /TiO 2 catalysts for selective hydrogenation of carboxylic acids to alcohols

2015 ◽  
Vol 24 (5) ◽  
pp. 646-654 ◽  
Author(s):  
Alexey Suknev ◽  
Vladimir Zaikovskii ◽  
Vasily Kaichev ◽  
Eugenii Paukshtis ◽  
Ekaterina Sadovskaya ◽  
...  
Keyword(s):  
Carboxylic Acids ◽  
Selective Hydrogenation ◽  
Active Sites

ChemInform Abstract: Lewis Acid Promoted Ruthenium(II)-Catalyzed Etherifications by Selective Hydrogenation of Carboxylic Acids/Esters.

ChemInform ◽  
2015 ◽  
Vol 46 (34) ◽  
pp. no-no
Author(s):  
Yuehui Li ◽  
Christoph Topf ◽  
Xinjiang Cui ◽  
Kathrin Junge ◽  
Matthias Beller
Keyword(s):  
Carboxylic Acids ◽  
Lewis Acid ◽  
Selective Hydrogenation

scholarly journals Infrared study of some 2-substituted-6-hydroxy-4-pyrimidine carboxylic acids: Correlation with MO-calculations

2000 ◽  
Vol 65 (5-6) ◽  
pp. 371-379 ◽  
Author(s):  
Ljubinka Bogunovic ◽  
Ubavka Mioc ◽  
Bratislav Jovanovic ◽  
Ivan Juranic
Keyword(s):  
Carboxylic Acids ◽  
Theoretical Calculations ◽  
Orbital Method ◽  
Mo Calculations ◽  
Hydroxy Compound ◽  
Infrared Study ◽  
Hydrogen Bond Formation ◽  
Methyl Derivatives ◽  
Dielectric Continuum ◽  
Low Solubility

The IR spectra of a series of 2-substituted-6-hydroxy-4-pyrimidine carboxylic acids (substituent = OH, SH, CH3, CH3S and NH2) were studied from the aspect of the influence of the subsitutent on the polarizability of some bonds, keto-enol tautomerism and hydrogen bond formation. The spectra were taken using solids due to the low solubility of the acids. Theoretical calculations were done using the MNDO-AM1 semiempirical molecular-orbital method. The stabilities of various tautomers were calculated simulating the dielectric continuum using the COSMO facility of the MOPAC program package. Theoretical calculations were made for all the possible tautomers of the 2-substituted-6-hydroxy-4-pyrimidine carboxylic acids. For the most stable isomers, the vibrational spectra were calculated. For the majority of the compounds the most stable isomer was identified having the structure 2-Y-6-oxo-4-carboxy-3H-pyrimidine. Besides this structure, for the 2-amino-, and 2-methyl- derivatives the zwitterionic forms have very similar stability. The 2-hydroxy compound is most stable as the 2,6-dioxo-1H, 3H isomer. The calculated vibrations for the compounds with a single stable structure correlate very well with the experimental frequencies. For the 2-methyl- and 2-amino- compounds the correlation is considerably less satisfactory. The most probable reason for this deviation is the existence of two or more tautomets in equilibrium. The correlation of the measured frequencies and the pKa values of the acids, indicate that the same tautomers exist in the solid state and in the solution.

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