Rhodia Chimie

Bluestar Silicones France Sas

Rhone-Poulenc Chimie

Centre National De La Recherche Scientifique

Rhodia Operations

Chanel Parfums Beaute

Cnrs

Elkem Silicones France Sas

Bluestar Silicones France

Laurent Saint-Jalmes

Christian Maliverney

Gilbert Guidot

Jean-Roger Desmurs

Etienne Fleury

Jean-Manuel Mas

Antoine Baceiredo

Tsuyoshi Kato

Sébastien Marrot

Gerard Forat

Nicolas Roques

Hubert Kempf

G&eacute;rard Forat

Christophe Rochin

Robert Janin

Ricardo Rodriguez

Marcel Morel

Christian Prud'Homme

Sébastien Sterin

Bernard Langlois

Claude Wakselman

Francois Metz

Marc Tordeux

Thierry Vidal

François Metz

Vincent Schanen

Catherine George

Sabine Delaire

Johann Vastra

Sylvie Large

Adrien Adao

James Russell

Amparo Prades

Mirjana Gelo-Pujic

Tarek Kassem

Norio Nakata

Sophie Gojon

Antoine J Baceiredo

Christian PRUD'HOMME

A metal complex including at least one metal atom chosen from the metals of Groups 8, 9 and 10 of the Periodic Table of the Elements and one or more ligands, wherein at least one ligand includes a cyclic silylene structure and a Lewis base which donates an electron pair to the silicon atom of the cyclic silylene structure.

Catalysts with a silylene ligand

A subject matter of the present invention is the use as catalyst, in particular in hydrosilylation, of a metal complex including at least one metal atom chosen from the metals of Groups 8, 9 and 10 of the Periodic Table of the Elements and one or more ligands, characterized in that at least one ligand includes a silene structure.

Catalysts having a silene ligand

The invention relates to a method for preparing carbene by means of deprotonation of a precursor salt using a strong base. A purpose of the invention is to enhance the synthesis of carbenes, i.e. to simplify same, to make said synthesis more economical and to obtain a liquid or solid, stable and pure form constituting a catalytic system that is easy to store and use and that has a higher efficiency, higher yield and higher selectivity than carbene catalysts of the prior art. In order to do so, the method comprises deprotonation in a solvent including an alcohol. The invention also relates to an alcohol-containing solution and carbene, and to a solid that can be obtained from the solution, e.g. by means of sublimation.

Method for preparing carbene in solution, novel stable form of carbene obtained in particular by means of said method, and uses thereof in catalysis

The invention relates to the use of novel stable carbenes in solution as organopolysiloxane polycondensation catalysts.

Uses of carbenes in solution as organopolysiloxane polycondensation catalysts

The invention relates to a silicone composition comprising components bearing &#x2261;SiH/&#x2261;SiOH groups, which can be polymerized/cross-linked by means of a dehydrogenative condensation reaction in the presence of a carbene-type catalyst in solution.

Silicone composition that can be cross-linked by means of dehydrogenative condensation in the presence of a carbene-type catalyst

Processes are described for preparing polyurethane polymers by reacting an isocyanate with an alcohol using a non-tin based catalyst having the formula 

Catalysts for reaction between an isocyanate and an alcohol

Cosmetic and therapeutic, in particular dermatological bioprecursors have the formula [A]-PP-[B]wherein PP is a polyphenol radical in which each hydroxyl function is protected by a group A or a group B, A is a saturated or unsaturated, substituted or unsubstituted alkyl radical having 1 to 20 carbon atoms which is bonded to the polyphenol,is an integer not less than 1, and B is a precursor of a biologically active molecule, which is also bonded to the polyphenol, andis an integer also not less than 1.

Polyphenolic bioprecursors

The present invention relates to an organopolysiloxane composition that can be vulcanized at room temperature into an elastomer that is crosslinked by polycondensation and that does not contain alkyltin-based catalysts and also to novel organopolysiloxane polycondensation catalysts.

Room temperature vulcanizable organopolysiloxane compound to give an elastomer and novel organopolysiloxane polycondensation catalysts

The present invention relates to a method for preparing a halogenoacetyl fluoride and the derivatives thereof. The inventive method for preparing a halogenoacetyl fluoride acid is characterized in that said method includes: a step of preparing a halogenoacetyl halide by photo-oxidation of a halogenoethylene compound in conditions such that the transformation rate of the halogenoethylene compound into halogenoacetyl halide is no higher than 80%, producing a reaction mixture essentially including halogenoacetyl halide and the excess halogenoethylene compound; a step of partial fluorination of the mixture obtained by reacting the latter with hydrofluoric acid suitable for obtaining a mixture of halogenoacetyl fluoride and the excess halogenoethylene compound; a step of separating the halogenoacetyl fluoride and the excess halogenoethylene compound. The invention can be used, specifically, for preparing the trichloroacetyl fluoride used as an intermediate species in the production of trifluoroacetic acid.

Process for the preparation of a halogenoacetyl fluoride and its derivatives

Catalysts, which are free of tin, are described which are useful in the reaction between an isocyanate and an alcohol, which is a key step for preparing polyurethane polymers. The catalyst is a metal complex or salt of formula (1):[Zn(L)(L)(Y)]&#x2003;&#x2003;(1)

Thermally-stable silicone elastomers are prepared from organopolysiloxane compositions by polyaddition, polycondensation or vulcanization reactions in the presence of peroxide; the thermal stability of the silicone elastomers is achieved by the inclusion of an additive derived from an iron (III) complex.

Thermally-stable crosslinked silicone elastomers

Room-temperature vulcanizable organopolysiloxane compound to give an elastomer and novel organopolysiloxane polycondensation catalysts

The invention relates to novel compounds with a guanidine structure, and more particularly nontoxic compounds with a silylated guanidine structure.

Compounds with a guanidine structure and use thereof for as organopolysiloxane polycondensation catalysts

The invention relates to a method for preparing difluoroacetic acid and the salts thereof. The invention also relates to the preparation of difluoroacetyl fluoride used as an intermediate product in the preparation of difluoroacetic acid. The method for preparing difluoroacetic acid according to the invention is characterized in that the same comprises the step of preparing difluoroacetyl fluoride by reacting dichloroacetyl chloride with hydrofluoric acid in a gaseous phase and in the presence of a chromium-based catalyst, followed by the step of hydrolysing the difluoroacetyl fluoride thus obtained.

Method for preparing difluoroacetic acid and salts thereof

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Vourles, France

Laurent Saint-Jalmes