Rhone-poulenc Chimie

Rhodia Chimie

R. P. Fiber & Resin Intermediates

Rhone-poulenc Fiber & Resin Intermediates

Rhoneapoulenc Fiber & Resin Intermediates

Rhodia Chemie

Laurent Gilbert

Michel Spagnol

Philippe-Jean Tirel

Gerard Forat

Eric Benazzi

Christian Marcilly

Philippe Leconte

Christophe Nedez

Virginie Pevere

Bernard Langlois

Nathalie Laurain

Marie-Christine Cotting

Emmanuel Marx

Michel Costantini

Georges Cordier

Serge Ratton

Michel Gubelmann

Francois Fajula

Jean-Michel Grosselin

Jean-Michel Popa

Anne-Marie Le Govic

Claude Doussain

Christophe Rochin

Helene Pernot

Claude Moreau

Annie Finiels

Marcelle Janin

James Russell

Jean Pierre Maestro

Rosemarie Bailliard

Henri Guillot

David Barratt

Gilles Laroze

Herve Garcia

Sylvie Razigade-Trousselier

The invention concerns a method of sulphonation characterised in that it consists in contacting a nucleophile whose nucleophilic atom is a nitrogen atom with a reagent comprising by successive or simultaneous addition: a heavy sulphonyl halide (i.e. whose atomic number is not less than that of chlorine), advantageously suphonyl chloride; and an organic base both not capable of alkylation and lipid soluble; and the organic part of said sulphonyl is perfluorinated on the carbon carried by the sulphur. The invention is applicable to organic synthesis.

Process for the synthesis of perfluorosulphonamides, of perfluorosulphonimides and of their salts, and a sulphonylation reagent

Method for the synthesis of perfluorosulphonamides, perfluorosulphonamides and their salts, and a sulphonation reagent

The present invention includes a process for the preparation of a lactam by vapor phase reaction of an aliphatic aminonitrile with water in the presence of a solid catalyst, wherein the catalyst is an alumina having a specific surface, measured by the BET method, greater than or equal to 10 m,/g. The alumina catalyst is further characterized by either: (a) a specific surface less than or equal to 280 m,/g, and a volume of pores with a diameter greater than 500 &angst; which is greater than or equal to 10 ml/100 g; or (b) a specific surface greater than or equal to 50 m,/g and less than or equal to 280 m,/g, and a volume of pores with a diameter greater than 70 &angst; which is greater than or equal to 30 m,/g.

Method for preparing lactam

A process for the preparation of halide compounds, preferably aryl halides, by contacting a gaseous mixture of hydrohalic acid and a compound selected from an aryl halogen formate, an aryl carbonate and equivalents thereof with a Lewis acid catalyst.

Process for the preparation of halogenated derivatives and Lewis acid base catalysts thereof

Acylation method for an aromatic compound

Method for the synthesis of an aromatic derivative ortho-disubstituted

Aromatic thioether acylation method

Phenol compound hydroxylation method

Process for the acylation of aromatic ethers

Method for partially hydrogenating dinitriles to aminonitriles

Process for the hydroxyalkylation of a carbocyclic aromatic ether

Carbocyclic/aliphatic ethers, for example anisole, quaicol, guaethol, p-methoxyphenol and ethylene dioxybenzene, are selectively prepared, in good yield, by reacting a phenolic compound, for example a phenol, hydroquinone, pyrocatechin, naphthol, or the like, with an alcohol, for example methanol, ethanol, isopropanol, ethylene glycol, etc., in gaseous phase, in the presence of a catalytically effective amount of a trivalent rare earth metal orthophosphate, for example a lanthanum, cerium or samarium orthophosphate, optionally doped with an alkali or alkaline earth metal, preferably cesium.

O-alkylation of phenolic compounds via rare earth orthophosphate

The present invention relates to a process for the preparation of lactams from dinitriles. It consists more precisely of a process for the preparation of lactam, linking two stages in series, one of hemihydrogenation of dinitrile to aminonitrile, the other of cyclizing hydrolysis of the aminonitrile after only one simple purification operation. Aliphatic lactams, such as especially epsilon-caprolactam, are base compounds for the preparation of polyamides (polyamide 6 from caprolactam).

Process for the preparation of lactams

The process for cleaving the heavy by-products derived from the synthesis of alkylchlorosilanes, in particular C.sub.1 to C.sub.6 alkylchlorosilanes, more particularly methylchlorosilanes, in particular for the cleavage of alkylchlorodisilanes, in particular methylchlorodisilanes having from one to five chlorine atoms, is carried out by treatment with hydrochloric acid in the presence of a catalytic system which comprises at least one metal phosphate, preferably associated with a basic impregnation compound. The metal phosphate may in particular correspond to the formula:

Process for cleaving the by-products of the direct synthesis of

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Lyons, France

Laurent Gilbert