Rhone-poulenc Chimie

Rhone-poulenc Agrochimie

Rhone-poulenc Specialites Chimiques

Rhone-poulenc Industries

Rhone-poulenc Sante

Rhodia Chimie

Rhone-poulenc Fiber & Resin Intermediates

Georges Cordier

Pierre Fouilloux

Jean-Michel Grosselin

Philippe Marion

Nathalie Laurain

Jean-Pierre Damon

Roland Jacquot

Laurent Gilbert

Bernard Langlois

Claude Mercier

Gerard Forat

Jean-Francis Spindler

Michele Besson

Jean-Serge Ferlut

Jacqueline Masson

Jean-Michel Popa

Gilbert Guidot

Patrick Leroux

Rosemarie Bailliard

The invention concerns a selective hydrodehalogenation method characterised in that it comprises a step which consists in contacting a substrate including a sp 3 hybridisation carbon atom bearing an electro-attracting group and at least a fluorine atom, and a halogen atom heavier than fluorine, with a reagent comprising: an aqueous phase, a base, a group VIII metal as hydrogenation catalyst, and hydrogen dissolved in the aqueous phase, at a concentration in equilibrium with a gas phase whereof the partial pressure in hydrogen is not less than 50 kPa, advantageously ranging between 50 kPa and 2.10 7 Pa. The invention is applicable to organic synthesis.

Selective hydrodehalogenation method

Metallic compounds useful as catalysts

Process for the preparation of fluoroanilines from fluorinated nitrated

Catalyst for the hydrogenation of nitriles to amines, preparation

Process for the preparation of a catalyst for the hydrogenation of

Process for the catalytic hydrogenation of nitriles to amines in the

Halonitroaromatic compounds, e.g., 3-chloro-4-fluoronitrobenzene, are selectively hydrogenated into the corresponding haloaromatic amines, in the essential absence of hydrodehalogenation, by reacting same with hydrogen in the presence of a catalytically effective amount of a novel Raney-type catalyst composition consisting essentially of an alloy of nickel, aluminum and molybdenum, Ni/Al/Mo, the Al/Mo ratio by weight thereof being equal to or greater than 1.

Raney-type catalysts for the hydrogenation of halonitroaromatic compounds

A process for the hydrogenation of halogenonitro-aromatic compounds wherein said compounds are contacted with a nickel-, cobalt- or iron-based catalyst, preferably Raney nickel, and hydrogen in the presence of a sulfur-containing compound. Preferably, the sulfur-containing compound is a sulfoxide or sulfone, and the molar ratio of the sulfur-containing compound to the catalyst ranges from about 1:1 to 10:1.

Process for the hydrogenation of halogenonitro-aromatic compounds in the

A process for the preparation of amino halogeno aromatic compounds, according to which a halogenonitro-aromatic compound is brought into the presence of a nickel-, cobalt- or iron-based catalyst, preferably nickel-based, and, more preferably, Raney nickel, in the presence of an effective amount of iodide, at a temperature and hydrogen pressure sufficient to form said halogenoamino-aromatic compound.

This invention relates to a process for preparation of a platinum-cobalt bi-metallic catalyst having an alloy structure.

Process for the preparation of a catalyst

The present invention relates to a process for the industrial preparation of trifluoroethanol by passage of a reaction mixture containing trifluoroacetic acid, water and trifluoroethanol over a percolating fixed bed consisting of a rhodium- or ruthenium-based catalyst.

Process for the preparation of trifluoroethanol

2-Methylpentanediamine is prepared by selectively liquid-phase hydrogenating a minimum concentration 2-methylglutaronitrile, initially nonammoniacal basic reaction medium in the presence of a catalytically effective amount of a Raney nickel-based catalyst, at a temperature of from 40.degree. to 150.degree. C., at a total pressure of less than 40 bars, and said reaction medium containing not more than 10% by weight of water.

Preparation of 2-methylpentadiamine

Unsaturated alcohols are prepared by hydrogenation of the corresponding carbonyl compounds in the presence of a platinum-cobalt bi-metallic catalyst having an alloy structure.

Process for the preparation of unsaturated alcohols

A process is disclosed for the preparation of perfluoroalkanols by reacting an ester of a perfluorinated acid in the liquid phase with hydrogen under a pressure of between about 1 and 300 bars in the presence of a catalyst based on at least one metal selected from nickel, cobalt, copper and the metals of the platinum group. The perfluoroalkanols are employed as synthesis intermediates in the pharmaceutical and plant-protection industries.

Process for the preparation of perfluoroalkanols

Growing community of inventors

Francheville, France

Georges Cordier