Centre National De La Recherche Scientifique

Societe Nationale Des Poudres Et Explosifs

Compagnie Generale D'electricite

Societe Nationale Industrielle Et Aerospatiale Des Poudres Et

Michel Troupel

Jacques Perichon

Jean-Francois Fauvarque

Anny Jutand

Esther D'Incan

Jacques Chaussard

Soline Sibille

Marie-Odile Moingeon

Christhophe Saboureau

Fernando Pfluger

Christophe Saboureau

Claude Chevrot

The process for the electrosynthesis of an aldehyde, according to the invention, is carried out by electrolysis, in a cell comprising only a single compartment, of an organic halide and of an N,N-disubstituted formamide such as dimethylformamide, followed by hydrolysis of the reaction mixture. The anode is made of a metal chosen from the group consisting of the reducing metals and their alloys, preferably zinc, aluminum or magnesium. The cathode, which is inert, is preferably covered with an electrolytic deposit of zinc, cadmium, lead or tin. Aldehydes are compounds which are commonly employed in many fields of the chemical industry, especially in perfumery, agricultural chemistry and pharmacy.

Process for the electrosynthesis of aldehydes

The invention relates to a process for the electrosynthesis of carboxylic acids of general formula R-COOH in which R is an organic radical by the electrochemical reduction, in the presence of carbon dioxide, of organic compounds corresponding to the general formula R--Y in which R is the above-mentioned organic radical and Y is a hetero atom-containing radical, the hetero atom of the radical Y, chosen from the group consisting of oxygen, nitrogen, sulphur andphosphorus, being directly linked to a carbon atom of the radical R by a single covalent linkage. When the hetero atom is nitrogen or phosphorus, the radical Y is an ammonium or phosphonium radical respectively. The anode, which is consumed during the electrosynthesis, is made of a metal chosen from the group consisting of reducing metals and their alloys, preferably made of magnesium, aluminium or zinc. This process without catalyst is very simple to perform and enables a cell with a single compartment to be employed. The carboxylic acids are commonly employed in the chemical industry, especially as intermediates for the synthesis of pharmaceutical products or of products used in plant protection.

Process for the electrochemical synthesis of carboxylic acids

The process includes an electrochemical reduction, under carbon dioxide atmosphere, of benzyl type ArCH.sub.2 X or ArCH(CH.sub.3)X halogenides. According to the invention, the process consists of operating in the presence of a catalyst containing at least one organometallic complex derived from a transition metal combined with a bidentate or tetradentate coordinate.

Process for preparing arylacetic and arylpropionic acids

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Maincy, France

Michel Troupel