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Electrocatalytic reduction of arylethyl chlorides at silver cathodes in the presence of carbon dioxide: Synthesis of 2-arylpropanoic acids by Abdirisak Ahmed Isse; Maria Grazia Ferlin; Armando Gennaro is a Engineering article available to read on EtoBox.

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The electrochemical reduction of some arylethyl chlorides ArCH(CH 3 )Cl , which are used as precursors in the electrosynthesis of important anti-inflammatory drugs, has been investigated at Ag and glassy carbon (GC) electrodes in CH 3 CN and DMF. In both solvents Ag shows a remarkable catalytic effect for the electroreduction of the halides. The E p values obtained at this electrode are 0.34-0.55 V more positive than those obtained at GC. The electrocatalytic effect of Ag is further enhanced by the presence of CO 2 , the observed positive E p shift increasing up to 0.55-0.76 V in CO 2 -saturated solvents. The mechanism of the electrochemical reduction of the halides at both electrodes is discussed. Large scale reduction of ArCH(CH 3 )Cl at Ag carried out in CO 2 -saturated solvents at 298.15 and 273.15 K led to the formation of ArCH(CH 3 )CO 2 H as the principal product. Although satisfactory acid yields were obtained in both cases, better results were obtained at the lower temperature; the acid yields were 61-73% and 70-81% at 298.15 and 273.15 K, respectively.

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Author

Abdirisak Ahmed Isse; Maria Grazia Ferlin; Armando Gennaro

Publisher

Elsevier ; Elsevier BV (ISSN 1572-6657)

Published

2005

Language

EN

Field

Engineering (Physical Sciences)