Reduction of acetophenones over Pd/AlPO[sub 4] catalysts. Linear free energy relationship (LFER)
- Universidad de Cordoba (Spain)
- Universidad Complutense, Madrid (Spain)
The authors studied the reduction of variously substituted acetophenones over Pd/AlPO[sub 4], Pd/AlPO[sub 4]-SiO[sub 2], and Pd/SiO[sub 2] catalysts containing 3% Pd by weight. After the catalysts were characterized texturally and kinetically, they were used to reduce the different acetophenones at various temperatures under the same reaction conditions. The results correlate with the Hammett equation quite well, and the reaction was found to feature different sensitivity to electron-withdrawing (0.05 < [rho] < 0.20) and electron-releasing substituents (0.76 < [rho] < 1.37). On the other hand, a compensating effect was also found to occur, so the reaction mechanism can be assumed to be the same for every substrate. The reductions probably do not take place via enol forms of the acetophenone. The reaction rate decreases with increasing solvent polarity. 44 refs., 5 figs., 4 tabs.
- OSTI ID:
- 6348179
- Journal Information:
- Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 140:2; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
ACETOPHENONE
ALUMINIUM COMPOUNDS
ALUMINIUM PHOSPHATES
CATALYSIS
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
ENERGY
FREE ENERGY
HETEROGENEOUS CATALYSIS
KETONES
KINETICS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PALLADIUM COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
PHYSICAL PROPERTIES
REACTION KINETICS
REDUCTION
SILICON COMPOUNDS
SILICON OXIDES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS