Rhodia Chimie

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Rhodia Fiber & Resin Intermediates

Rhodia Chemie

Michel Spagnol

Francois Mathey

Francois Mercier

Laurent Gilbert

Frederic Robin

Roland Jacquot

Eric Benazzi

Christian Marcilly

Marc Lemaire

Fr&eacute;d&eacute;ric Robin

Virginie Mouries

Emmanuelle Schulz

Michel Costantini

Carl Patois

Philippe-Jean Tirel

St&eacute;phane Lelievre

Fran&ccedil;ois Mercier

Fran&ccedil;ois Mathey

Rob Tel Halle

Thierry Lamouille

Christine Saluzzo

Henri Guillot

Beno&icirc;t Colasson

Rob Ter Halle

New optically active bis&lsqb;1-phospha-2,3-diphenyl-4,5-dimethylnorbornadiene&rsqb; diphosphines and new optically active transition metal complexes with said phosphines are described. The complexes are useful as catalysts to promote hydrogenation of substrates.

Optically active diphosphines, preparation thereof according to a process for the resolution of the racemic mixture and use thereof

The invention concerns optically active polymers, obtainable by polymerizing chiral diphosphine having a C2 axis of symmetry, excluding all other symmetry element, with one or several polymerizable monomers, said chiral diphosphine consisting of a chiral body bearing two identical functional groups capable of reacting with said polymerizable monomers.

Optically active linear polymer used as ligand in the preparation of metallic complexes designed for asymmetric catalysis

A process for separating the (d/l) and (meso) diastereoisomers of bis-&lsqb;1-phospha-2,3-diphenyl-4,5-dimethylnorbornadiene&rsqb; comprising converting the mixture of diastereoisomers of bis-&lsqb;1-phospha-2,3-diphenyl-4,5-dimethylnorbornadiene&rsqb; to a mixture of the corresponding diastereoisomers of diphosphine disulphide or dioxide, then in separating the two diastereoisomers in dioxide or disulphide form.

Method for separating a diphosphine diastereoisomers

Resolution method for a racemic mixture of aldehydes

The invention concerns a method for preparing a compound of formula (1) wherein: A represents naphthyl or phenyl optionally substituted; and Ar , Ar independently represent a saturated or aromatic carbocyclic group, optionally substituted.

Method for preparing chiral diphosphines

The invention concerns a method for preparing a benzylic-type ether from an aromatic compound. The inventive method for preparing a benzylic-type ether from an aromatic compound is characterised in that it consists in: in a first step, acylating an aromatic compound by reacting said aromatic compound with an acylating agent, in the presence of an efficient amount of zeolite or a Friedel-Crafts catalyst leading to a ketonic compound; in a second step, reducing the carbonyl group into carbinol leading to a benzylic alcohol; in a third step, etherifying the hydroxyl group, by reacting the benzylic alcohol with another alcohol, in the presence of an efficient amount of zeolite.

Method for preparing a benzylic-type ether

A process for condensing at least one carbonyl compound carrying at least one electron-withdrawing group with an aromatic derivative carrying at least one hydroxyl functional group, wherein the electron-withdrawing group present on the carbonyl compound is selected from fluoroalkyl derivatives, esters, including orthoesters, and nitriles and said condensation is carried out in a basic medium.

Process for the condensation of a carbonyl compound with an aromatic derivative in a basic medium

6,6&prime;-bis-(1-phosphanorbornadiene) diphosphines, their preparation and their uses

The present invention relates to optically active diphosphines. It is also targeted at their preparation according to a process for the resolution of the racemic mixture of the said phosphines to optically active isomers. The subject of the invention is new optically active bis&lsqb;1-phospha-2,3-diphenyl-4,5-dimethylnorbornadiene&rsqb; diphosphines and a process for resolving the racemic bis&lsqb;1-phospha-2,3-diphenyl-4,5-dimethylnorbornadiene&rsqb; mixture which comprises reacting it with a palladium or platinum complex as chiral auxiliary in an organic solvent, thus forming diastereoisomer complexes, and then resolving the said optically pure complexes. The invention also relates to new optically active metal complexes comprising the said phosphines and to their use in a process for the preparation of optically active carboxylic acids and/or derivatives according to a process for the hydrogenation of &agr;,&bgr;-unsaturated carboxylic acids and/or derivatives.

The present invention relates to a process for etherification of a benzyl type alcohol, to the products obtained and to their applications, in particular in the perfumery field. The etherification process of the invention consists of reacting a benzyl type alcohol with another alcohol in the presence of a catalyst, characterized in that the etherification reaction is carried out in the presence of an effective quantity of a zeolite.

Method for etherifying a benzyl alcohol, resulting products and applications

A subject of the present invention is a process for the reduction of a carbonyl compound. More precisely, the invention relates to a process for reduction of an aldehyde and/or of a ketone. The reduction process of the invention, which consists of reacting a carbonyl compound with an alcohol in the presence of a zeolite catalyst, is characterized by the fact that it comprises: mixing, in any manner whatever, the carbonyl compound and the alcohol, passing said mixture over a catalyst bed containing at least one zeolite, subjecting the reaction mixture leaving the catalyst bed to recirculation over the catalyst bed, for a number of times that is sufficient to obtain the desired degree of conversion of the substrate.

Method for reducing a carbonyl-containing compound

6&prime;,6-bis-(1-phosphanorbornadiene) diphosphines

The present invention concerns the aminomethylation of pentenoic acid derivatives, by reaction with carbon monoxide, hydrogen and ammonia, for preparing caprolactam. More precisely, it is directed to a method for preparing caprolactam wherein the aminomethylation of pentenoic acid derivatives is carried out by reaction with carbon monoxide, hydrogen, and ammonia, at a temperature higher than 30&deg; C. and in the presence of a catalyst with a base of at least one metal of Group VIII of the Periodic Table.

Preparation of caprolactam

Acylation method for an aromatic compound

Asymmetric hydrogenation method of a ketonic compound and derivative

Growing community of inventors

Meyzieu, France

Michel Spagnol