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Lee, Jae Sung
Eco-friendly Catalysis and Energy Lab
Research Interests
  • Photocatalytic water splitting, artificial photosynthesis, fuel cells, heterogeneous catalysis

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A palladium complex catalyst for the regioselective hydrocarboxylation of 4-methylstyrene

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Title
A palladium complex catalyst for the regioselective hydrocarboxylation of 4-methylstyrene
Other Titles
A palladium complex catalyst for the regioselective hydrocarboxylation of 4-methylstyrene
Author
Yoon, Je-YongJang, Eun JooLee, Kyung HeeLee, Jae Sung
Keywords
CARBON-MONOXIDE; ORGANIC SYNTHESES; MILD CONDITIONS; OLEFINS; HYDROCARBOALKOXYLATION; ESTERS; ALKOXYCARBONYLATION; CONVERSION; MECHANISM; OXIDATION
Issue Date
1997-04
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL, v.118, no.2, pp.181 - 187
Abstract
With a homogeneous catalyst system of PdCl2-CuCl2-PPh3 dissolved in a polar solvent, highly regioselective hydrocarboxylation of 4-methylstyrene to the branched alpha-(4-methylphenyl) propionic acid has been achieved. Effects of additives (mineral acids and O-2) and reaction conditions (amounts of catalyst components, reaction temperature, pressure and solvents) have been studied. Compared with the previous results of hydrocarboalkoxylation of 4-methyl-styrene to the ester by the same catalyst, the hydrocarboxylation required severer reaction conditions and the presence of a polar solvent that could solubilize water. Efficient hydrocarboxylation was achieved only after fine adjustments of the reaction conditions and addition of a halogen compound. And the addition of HCl improved the reaction rate significantly. This improvement was due to the effect of chlorine, not the effect of the proton. The addition of oxygen reduced reaction rates by oxidizing carbon monoxide and PPh3
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DOI
10.1016/S1381-1169(96)00396-2
ISSN
1381-1169
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ECHE_Journal Papers
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