Societe Nationale Elf Aquitaine

Rhone-Poulenc Chimie

Rhodia Chimie

Firmenich Sa

Elf Aquitaine

Synkem

Jean-Pierre Genet

Sylvain Juge

Monique Savignac

Jean-Marie Bernard

Sandrine Lemaire-Audoire

Errol Blart

Jean-Alex Laffitte

Sergio Mallart

Catherine Pinel

Jean-Christophe Galland

Dominique Pons

Valentin Rautenstrauch

Philippe Dellis

Massoud Stephan

Jean A Laffitte

Nicolas Champion

Serge Mallart

Virginie Vidal

Jean-Yves Lenoir

Koenraad P Vanhessche

Sébastien Duprat De Paule

The invention relates to novel diphosphines, in optically pure or racemic form, of formula (I):in which: The invention further relates to the use of a compound of formula (I) as a ligand for the preparation of a metal complex useful as a chiral catalyst in asymmetric catalysis, and to the chiral metal catalysts comprising at least one ligand of formula (I).

Diphosphines, their complexes with transisition metals and their use in asymmetric synthesis

Process for preparing a polyaromatic compound

The subject matter of the present invention relates to a reagent and a process useful for cleaving a functional group protected by an alkoxycarbonyl group during an organic synthesis. This reagent comprises: a) an aqueous phase; b) a catalyst comprising at least one group VIII element in the periodic table of elements and at least one water-soluble ligand, wherein the group VIII element in the periodic table is maintained in the aqueous phase by the formation of a complex with at least one water-soluble ligand; and c) a nucleophilic compound soluble in the aqueous phase; and optionally d) an organic phase.

Reagent useful for cleaving a protected functional group

Ruthenium catalysts and their use in the asymmetric hydrogenation of

Reagent and catalytic process useful for cleaving a protected functional

Deallylation reagent and deallylation method using said reagent

Process for enantioselective hydrogenation of the oxo C.dbd.O double bond

Process for the hydrogenation of ethylenically unsaturated organic

Preparation of chiral catalysts based on ruthenium and phosphorus

This invention is concerned with new chiral diphosphinite-borane compound of the formula ##STR1## wherein R.sup.1 and R.sup.2, identical or different, represent each a C.sub.1 -C.sub.18 alkyl, C.sub.5 -C.sub.18 cycloalkyl, C.sub.7 -C.sub.18 aralkyl or C.sub.6 -C.sub.14 aryl group which can bear functional groups,

Chiral phosphinite-boranes, their preparation and uses

New chemical product, constituted by an organic phosphorus compound of the structure ##STR1## where Q is an N or O atom, T is an alkylene or arylene, possibly carrying substituents, or not existing, while R.sup.1 to R.sup.7, the same or different, are H or aliphatic, cycloaliphatic and/or arylic hydrocarbon radicals, possibly substituted, R.sup.3 not existing when Q is oxygen. This product is used as an intermediate in the preparation of different derivatives of phosphinous acid.

Process for preparation of derivatives of phosphinous acid

Oxidation of epoxy alcohols into carboxilic epoxy acids

New organic phosphorus compounds, comprised of hetero-phosphacycloalkanes whose phosphorus atom forms a complex with a borane. They can be prepared by the action of a borane on a hetero-phosphacycloalkane, within a solvent, at temperatures ranging from -20.degree. to +60.degree. C. Their transformation into other derivatives, phosphinites or phosphines in particular, can be carried out without any modification in the chirality of the initial complex. An especially useful application is their conversion into highly optically active phosphines, used in particular as catalysts in various reactions.

Organic phosphorus compounds complexed to boron, their preparation and

Process for preparation of derivatives of phosphinous acid and

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Fontenay-Aux-Roses, France

Jean-Pierre Genet