Rhone-poulenc Chimie

Rhodia Chimie

Rhone-poulenc Nutrition Animale

Centre National De La Recherche Scientifique

Societe Nationale Elf Aquitaine

Cis Bio International

Michel Pereyre

Bernard Jousseaume

Jean-Marc Frances

Veronique Gouron

Jean-Marie Bernard

Pierre F Chabardes

Claude Filliatre

Nicholas Noiret

Bernard Delmond

Dominique Serramedan

Jean-Claude Pommier

Laurent Mauclaire

Jean-Paul Quintard

Bernard Elissando

Jean-Marie Frances

Catherine Bedel

Jean-Claude Saccavini

Tin derivatives for use as oxygen-activated latent polycondensation catalysts. According to the invention, said tin derivatives have at least one tin-tin bond of the formula (I): R &mdash;Y &mdash;R wherein R and R which can be the same or different, are selected from hydrogen, and advantageously from the hydrocarbon radicals or together form a divalent radical or a single ring forming-bond; wherein n is at least equal to 2; wherein the Y, which are the same or different, stand for a stannic grouping having the structure (s): R&prime; and R&Prime;, which can be the same or different, are selected from hydrogen and advantageously from the hydrocarbon radicals. Application to paints.

Use of tin derivatives as latent polycondensation catalysts, and premix containing them

Tin derivatives for use as oxygen-activated latent polycondensation catalysts. Said tin derivatives having a formula R,-Y,-R,, wherein R,and R,together form a divalent group or a single bond which insures the formation of a ring with n being 5, 6 or 7, the radicals Y, which may be similar or different, represent a tin-membered chain unit of a structure R&prime;-Sn-R&Prime;, wherein R&prime; and R&Prime;, which may be similar or different are a hydrogen or a hydrocarbon radical.

The present invention relates to metallized porphyrin derivatives having the formula: ##STR1## wherein the R and M variables are as defined in the specification. Said porphyrin derivatives having uses as antitumor agents, diagnostics agents, or in therapy.

Derivatives of porphyrin and metalloporphyrins optionally coupled to a

A process for preparing cyclocitral by expoxidizing a pyronene.

Process for preparing cyclocitral

Epoxides represented by the formula: ##STR1## in which A represents a methylene or oxirane group and a process for their preparation.

Epoxides and a process for their preparation

Novel tetracoordinated tin (IV) compounds, well suited as latent catalysts for the preparation of polyurethanes or for the crosslinking of curable diorganopolysiloxanes (upon thermal decomposition thereof into diorganotin dicarboxylates or dialcoholates), have the general formula (1): ##STR1## in which the radicals R, which may be the same or different, are each a linear or branched chain C.sub.1 -C.sub.20 alkyl radical, a mononuclear aryl radical, or an aralkyl or alkaryl radical, the alkyl moieties of which having from 1 to 6 carbon atoms; the radicals R.sub.1 and R.sub.2, which may be the same or different, are each a hydrogen atom, a cyano radical, a C.sub.1 -C.sub.6 alkyl radical, or an alkoxycarbonyl radical, the alkyl moiety of which having from 1 to 6 carbon atoms, with the proviso that R.sub.1 and R.sub.2 may together form a saturated hydrocarbon ring member having from 5 to 8 carbon atoms; the radical R.sub.3 is a hydrogen atom, a linear or branched chain C.sub.1 -C.sub.20 alkyl radical, a linear or branched chain C.sub.1 -C.sub.20 alkoxy radical, a mononuclear aryl radical or a mononuclear aryloxy radical; and a is 0 or 1.

Tin (IV) compounds

Optionally chelated tetracoordinated or pentacoordinated tin(IV) compounds having the general formula: ##STR1## are useful latent catalysts in compositions for the preparation of polyurethanes, or for the crosslinking of organopolysiloxanes, by increasing the temperature of appropriate reaction mixtures to a level above the decomposition temperature of such tin(IV) compound.

Optionally chelated tin(IV) compounds useful as latent catalysts

Novel tin (IV) compounds

Storage-stable, curable polyorganosiloxane compositions, whether solvent-free, in solution in an organic solvent or in aqueous emulsion, contain (A) a polydiorganosiloxane having silanol endgroups, (B) a polydiorganohydrosilane, and (C) a catalytically effective amount of a latent tin catalyst of the formula (1): ##STR1## and are cured into elastomeric state by heating to a temperature at least equal to the decomposition temperature of the latent catalyst (C); such polyorganosioxane compositions are well adopted for the thin-layer coating of a wide variety of useful substrates, e.g., paper.

Curable polyorganosiloxane compositions comprising latent tin catalysts

The invention concerns a method of preparation of aminomethyltriorganotin compounds, preferably .alpha.-mono or disubstituted, the new tin compounds obtained thereby and an application of said tin compounds to the synthesis of aminomethylorganometallic compounds and to the regiospecific preparation of .beta.-aminoalcohols. The intermediate tin and metallic compounds are new. The method for preparing the tin compounds comprises reacting an iminium salt with a corresponding stannylanion, preferably a triorganostannylanion. This method provides best yields and provides regiospecific .beta.-aminoalcohols useful by having in most cases a large spectrum of pharmacological activities.

Aminomethyltriorganotin compounds, preferably .alpha.-mono or

Process for the preparation of stannic tetra mercaptides in an economic manner through the action of corresponding mercaptans and metallic tin, at a temperature maintained between 15.degree. C. and 200.degree. C.

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Talence, France

Michel Pereyre