Patents by Inventor Claude Wakselman
Claude Wakselman has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 6506286Abstract: A reagent comprising a compound of formula (I): Rf—M(X)(Z)n—Y—R, wherein R is a hydrocarbon radical advantageously having at most 10 carbon atoms and being selected from alkyls and aryls; Rf is a radical of formula II: R1—(C&Xgr;2)m—CF2—, where R1 is a fluorine or chlorine atom or a carbon radical, m is 0 or a integer from 0-12, and each &Xgr;, which may be the same or different, is a chlorine or preferably fluorine atom, with the proviso that when m is 0, R1 is electroattractive, preferably a fluorine atom; n is 0 or 1; M is a non-metal selected from carbon and chalcogens with an atomic number than oxygen; and each of X, Y and Z, which are the same or different, is a chalcogen; as well as a generator, for consecutive or simultaneous addition. The reagent is useful for organic synthesis.Type: GrantFiled: August 24, 2000Date of Patent: January 14, 2003Assignee: Rhodia ChimieInventors: Bernard Langlois, Nicolas Roques, Claude Wakselman, Marc Tordeux, GĂ©rard Forat
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Patent number: 6486351Abstract: The invention concerns a method for the condensation of aromatic derivative(s) or a sulphinic derivative by a perhalogenated, advantageously perfluorinated, carbon atom. Said method is characterized in that it consists in subjecting said sulphinic derivative and said aromatic derivative to the action of a strong acid whereof the pKa is not more that 0. The invention is applicable to organic synthesis.Type: GrantFiled: March 7, 2001Date of Patent: November 26, 2002Assignee: Rhodia ChimieInventors: Laurent Saint-Jalmes, Marc Tordeux, Claude Wakselman
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Patent number: 6156163Abstract: A reagent comprising a compound of formula (I): R.sub.f --M(X) (Z).sub.n --Y--R, wherein R is a hydrocarbon radical advantageously having at most 10 carbon atoms and being selected from alkyls and aryls; R.sub.f is a radical of formula II: R.sub.1 --(C.XI..sub.2).sub.m --CF.sub.2 --, where R.sub.1 is a fluorine or chlorine atom or a carbon radical, m is 0 or a integer from 0-12, and each .XI., which may be the same or different, is a chlorine or preferably fluorine atom, with the proviso that when m is 0, R.sub.1 is electroattractive, preferably a fluorine atom;n is 0 or 1; M is a non-metal selected from carbon and chalcogens with an atomic number higher than oxygen; and each of X, Y and Z, which are the same or different, is a chalcogen; as well as a generator, for consecutive or simultaneous addition. The reagent is useful for organic synthesis.Type: GrantFiled: November 6, 1997Date of Patent: December 5, 2000Assignee: Rhodia ChimieInventors: Bernard Langlois, Nicolas Roques, Claude Wakselman, Marc Tordeux, Gerard Forat
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Patent number: 6111136Abstract: The invention consists of a new method for preparing perfluoroalcanecarboxylic and perfluoroalcanesulfonic acids in which ozone is made to react, in a protic environment, upon a perfluoroalkyl chain comprising at least one oxydizable chemical group.Type: GrantFiled: September 4, 1998Date of Patent: August 29, 2000Assignees: Electricite de France Service National, Centre National de la Recherche ScientifiqueInventors: Hatem Marzouk, Laurent Petit, Marc Tordeux, Amaya Berecibar, Claude Wakselman
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Patent number: 5283337Abstract: The present invention relates to a process for the preparation of perhaloalkylthioethers by bringing a perhaloalkyl halide, preferably a bromide or an iodide, into contact with a disulphide in the presence of zinc and of sulphur dioxide or of a dithionite or of a hydroxymethanesulphinate or of a formate anion and sulphur dioxide.Type: GrantFiled: November 8, 1991Date of Patent: February 1, 1994Assignee: Rhone-Poulenc AgrochimieInventors: Claude Wakselman, Marc Tordeux, Bernard Langlois, Jean-Louis Clavel, Roland Nantermet
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Patent number: 5082945Abstract: The present invention relates to a process for the preparation of perhaloalkylthioethers by bringing a perhaloalkyl halide, preferably a bromide or an iodide, into contact with a disulphide in the presence of zinc and of sulphur dioxide or of a dithionite or of a hydroxymethanesulphinate or of a formate anion and sulphur dioxide.Type: GrantFiled: December 12, 1989Date of Patent: January 21, 1992Assignee: Rhone-Poulenc AgrochimieInventors: Claude Wakselman, Marc Tordeux, Bernard Langlois, Jean-Louis Clavel, Roland Nantermet
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Patent number: 4992592Abstract: A class of compounds, namely 1-fluoro-1-halo-3,6-dioxabicyclo[4.1.0]heptanes and a process using these compounds in the preparation of fluoromalonaldehyde acetals. The 1-fluoro-1-halo-3,6-dioxabicyclo[4.1.0]heptane is brought into contact with an alcohol in an acid medium. The fluoromalonaldehyde acetals obtained are also new products, which are useful for the synthesis of alkyl fluoromalonates or of fluorinated nitrogen-containing heterocycles.Type: GrantFiled: May 11, 1989Date of Patent: February 12, 1991Assignee: Rhone-Poulenc ChimieInventors: Huguette Molines, Claude Wakselman
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Patent number: 4866190Abstract: A process for the preparation of perhaloalkanesulfinic and -sulfonic acids and derivatives of these acids. A perhaloalkanesulfinic acid salt is prepared by contacting a metal hydroxymethanesulfinate (preferably, a sodium, zinc or copper hydroxymethanesulfinate) with a perhaloalkyl halide group, in a polar solvent. Optionally, the perhaloalkanesulfinic acid salt is then converted to a perhaloalkanesulfinic or -sulfonic acid or a derivative of either of these acids.Type: GrantFiled: February 3, 1988Date of Patent: September 12, 1989Assignee: Rhone-Poulenc ChimieInventors: Marc Tordeux, Bernard Langlois, Claude Wakselman
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Patent number: 4855460Abstract: A process for the preparation of perfluoroalkylated ketones and/or perfluoroalkylated alcohols, comprising the step of contacting a perfluoroalkyl iodide or perfluoroalkyl bromide with an acid anhydride, in the presence of a metal chosen from zinc and cadmium.Type: GrantFiled: July 11, 1988Date of Patent: August 8, 1989Assignee: Rhone-Poulenc ChimieInventors: Marc Tordeux, Claude Wakselman, Catherine Francese
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Patent number: 4803298Abstract: A process for the preparation of a perfluoroalkyl ketone. A perfluoroalkyl halide, zinc and an ester are brought into contact with one another. Preferably a polar aprotic solvent and/or a pyridine is also present.Type: GrantFiled: July 15, 1987Date of Patent: February 7, 1989Assignee: Rhone-Poulenc ChimieInventors: Catherine Francese, Marc Tordeux, Claude Wakselman
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Patent number: 4794200Abstract: A process for the preparation of trifluoromethyl iodide by bringing into contact with one another to form a reaction product either:zinc, sulfur dioxide, and trifluoromethyl bromide, or(b) sodium dithionite and trifluoromethyl bromide;in a polar aprotic solvent, such as dimethylformamide, preferably followed by a filtration stage to remove the solid products. Thereafter, iodine dissolved in carboxylic or sulfuric acid is added to the reaction product, and trifluoromethyl iodide is evolved.Type: GrantFiled: October 9, 1987Date of Patent: December 27, 1988Assignee: Rhone-Poulenc ChimieInventors: Marc Tordeux, Claude Wakselman
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Patent number: 4788012Abstract: A process for the preparation of a benzyl trifluoromethyl sulfide by bringing a benzyl thiocyanate and trifluoromethyl bromide into contact with zinc in a polar aprotic solvent or a pyridine. The invention also relates to a process for the preparation of trifluoromethane sulfonyl chloride by bringing a benzyl trifluoromethyl sulfide into contact with chlorine and water.Type: GrantFiled: May 21, 1987Date of Patent: November 29, 1988Assignee: Rhone-Poulenc ChimieInventors: Catherine Francese, Marc Tordeux, Claude Wakselman
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Patent number: 4731450Abstract: A process for the perfluoroalkylation of aromatic derivatives. In a first stage, an aromatic derivative, sulfur dioxide and a metal selected from the group consisting of zinc, aluminum, manganese, cadmium, magnesium, tin, iron, nickel and cobalt, are brought into contact in a solvent, preferably a polar aprotic solvent. In a second stage, a perfluoroalkyl bromide or iodide is added to react with the aromatic derivative.Type: GrantFiled: May 21, 1986Date of Patent: March 15, 1988Assignee: Rhone-Poulenc Specialites ChimiquesInventors: Claude Wakselman, Marc Tordeux
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Patent number: 4701569Abstract: A process for the preparation of perfluoroalkylated alcohols and esters by bringing a carbonyl-containing derivative and a perfluoroalkyl iodide or bromide into contact with zinc, preferably in the presence of a polar aprotic solvent and/or a pyridine.Type: GrantFiled: May 21, 1986Date of Patent: October 20, 1987Assignee: Rhone-Poulenc Specialties ChimiquesInventors: Catherine Francese, Marc Tordeux, Claude Wakselman
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Patent number: 4504287Abstract: The invention relates to a method for purifying a gas mixture containing at least one undesirable gas compound utilizing certain sulfonamide or sulfamide solvents.Type: GrantFiled: September 13, 1982Date of Patent: March 12, 1985Assignees: Compagnie Francaise de Raffinage, Agence Nationale de Valorisation de la Recherche (ANVAR)Inventors: Martial Atlani, Roben Loutaty, Claude Wakselman, Charles Yacono
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Patent number: 4377711Abstract: Disclosed are aromatic bromopolyfluoroalkyl ethers of the formula: ##STR1## where n is equal to 1 or 2 and R represents at least one moiety selected from the group consisting of hydrogen, the alkyl radicals having from 1 to 12 carbon atoms, the phenyl radical, the alkoxy radicals having from 1 to 12 carbon atoms, the phenyloxy radical, and the radicals NO.sub.2, CN, Cl, F, Br, I, CF.sub.3, and CONR.sub.1 R.sub.2 and NR.sub.1 R.sub.2 where R.sub.1 and R.sub.2 are identical or different and represent each a hydrogen or an alkyl radical having from 1 to 6 carbon atoms. Also disclosed is a method for preparation of these ethers. These compounds are useful as intermediates in producing products exhibiting phytosanitary or pharmaceutical activity.Type: GrantFiled: November 4, 1981Date of Patent: March 22, 1983Assignee: Rhone-Poulenc IndustriesInventors: Isabelle Rico, Claude Wakselman
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Patent number: 4316796Abstract: Dienic and/or aromatic hydrocarbons are separated from hydrocarbon fractions employing known liquid-liquid extraction and/or extractive distillation procedures and at least one sulfonamide solvent conforming to the general formula ##STR1## wherein R', R" and 4'" can be linear or branched, saturated or unsaturated, aliphatic groups possessing from 1 to 18 carbon atoms, wherein two or three of groups R', R" and R'" can be identical, wherein one of the groups R" and R'" can be replaced with a hydrogen atom, and wherein at least one of groups R', R" and R'" is unsaturated.Type: GrantFiled: September 12, 1980Date of Patent: February 23, 1982Assignees: Compagnie Francaise de Raffinage, Agence Nationale de Valorisation de la Recherche (ANVAR)Inventors: Martial Atlani, Roben Loutaty, Claude Wakselman, Charles Yacono
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Patent number: 4246200Abstract: This invention relates to compounds having the formula ##STR1## in which R.sub.F is a perfluoro radical C.sub.n F.sub.2n+1 with n=1-20, and R is a C.sub.1-20 alkyl radical, a C.sub.4-15 cycloalkyl radical, a C.sub.5-20 cycloalkyl-alkyl radical, or a C.sub.6-20 aromatic radical.Said compounds constitute valuable intermediates for the synthesis of surface-active agents.Type: GrantFiled: May 29, 1979Date of Patent: January 20, 1981Assignee: Agence Nationale de Valorisation de la Recherche (ANVAR)Inventors: Claude Wakselman, Marc Tordeux
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Patent number: 4170547Abstract: Process for the extraction of diene or aromatic hydrocarbons from petroleum hydrocarbon fractions employing sulfonamides as solvents. Also described are new sulfonamides useful as solvents for the extraction process.Type: GrantFiled: October 25, 1978Date of Patent: October 9, 1979Assignees: Compagnie Francaise de Raffinage, Agence Nationale de Valorisation de la Recherche (ANVAR)Inventors: Martial Atlani, Vincent Corso, Claude Wakselman, Roben Loutaty, Charles Yacono