Rhodia Chimie

Rhodia Operations

Michel Dury

Christian Priou

Jacques Richard

Jean-Roger Desmurs

Christian Prud'Homme

Hervé Bres

Paul Cruciani

Cecile Serrano

Metallic dihydroxybenzenedisulfonates are prepared, preferably from alkaline metals, from corresponding dihydroxybenzenedisulfonic acids, by reacting the dihydroxybenzenedisulfonic acid present in a sulfuric medium with an adequate amount of a salt including a sulfate or hydrogenosulfate anion.

Preparation of metallic dihydroxybenzene-disulfonates

The present invention relates to the use of a stabilising composition free of derivatives of 6-aminouracyl or 6-aminothiouracyl type, and comprising at least one &#x3b2;-diketone bearing two aromatic nuclei, at least one of which bears at least one substituent on one of the two orthopositions or on the paraposition; the said substituent being chosen from &#x2014;R, &#x2014;OR, &#x2014;SR, &#x2014;COOH, &#x2014;O&#x2014;CFand &#x2014;S&#x2014;CFradicals, in which formulae R is an alkyl radical. The invention also relates to halogenated polymers comprising such a stabilising composition.

Use of substituted biaromatic &#x3b2;-diketone as stabilizing agent of halogenated polymers and resulting polymer

The invention concerns a novel method for preparing tetrakis(pentafluorophenyl)borate derivatives of general formula MB(C F ) , M being selected among Na , Li , or K , wherein: (a) a C F X solution, X being selected among H, Cl, Br or I, in anhydrous butylic ether is contacted with an alkyllithium, the mol ratio of C F X/alkyllithium being 1 to 1.1, and the alkyl radical, linear or branched comprising 1 to 10 carbon atoms; (b) the resulting product is contacted with previously non-dissolved BR , R, identical or different being selected among a chlorine atom, a fluorine atom, a bromine atom, an alkoxy radical comprising between 1 and 4 carbon atoms.

Process for the preparation of tetrakis (pentafluorophenyl) borate derivatives

Method for preparing tetrakis (pentafluorophenyl) borate derivatives

The halogenation of a compound of formula (1) or formula (2&prime;), wherein Q is an NH,group optionally in the form of an addition salt, or an NHCOCH,group, and X is a halogen atom, using a compound of formula X,, in a solvent selected from an anhydrous halogenated hydrocarbon, a mixture of water and a halogenated hydrocarbon and optionally the compound of formula (1) itself, gives a 2-amino or 2-acetamido trifluoromethylbenzene halogenated in the 5 position of the benzene ring.

Method for preparing halogenated 2-amino or 2-acetamido trifluoromethylbenzene derivatives

Method for preparing 2-trifluoro-methoxy-aniline

Method for C-alkylating hydroxylated aromatic compounds

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Lyons, France

Michel Dury