Abstract:
The present invention relates to a process for the preparation of β- or γ-unsaturated or saturated carboxylic acids.It relates more particularly to the hydroxycarbonylation of an organic compound comprising a conjugated unsaturation, such as butadiene, by the action of carbon monoxide and water in the presence of a palladium-based catalyst. The carboxylic acids thus obtained are preferably pentenoic acids. According to the invention, the reaction medium after the end of the hydroxycarbonylation stage is treated with hydrogen to reduce the palladium present in the 2+ oxidation state to palladium in the zero oxidation state and the precipitated palladium is recovered.
Abstract:
A device for detecting and/or quantifying organophosphorus compounds, including an electrical device including a source electrode and a drain electrode separated by a semiconductive material, characterized in that at least one receptor molecule, including a group R and a primary alcohol in spatial proximity to a tertiary amine, with which the primary alcohol is capable of reacting in the presence of an organophosphorus compound, is grafted, by the group R, onto one of the electrodes or onto the semiconductive material, and a device for detecting the variation in positive charges between the two electrodes.
Abstract:
The present invention relates to a process for producing carboxylic acids. It relates more particularly to a process for producing carboxylic acids by oxidation of a hydrocarbon with oxygen or a gas containing oxygen, and even more particularly to the oxidation of cyclohexane to adipic acid. It relates to a process comprising a step consisting of hydrolysis of the esters formed during the oxidation step.
Abstract:
The invention relates to a method for the functionalisation of metal nanowires and the use of said nanowires. The functionalisation method of the invention includes a step comprising the formation of a self-assembled monolayer on at least part of the external surface of metal nanowires, using a compound of formula R1—Zn—R2, wherein Z is S or Se, and n is equal to 1 or 2, and R1 is a hydrogen atom or an acyl group or a hydrocarbon group comprising between 1 and 100 carbon atoms and R2 is an electron-attracting or -donating group. The method if the invention is particularly suitable for use in the field electrode production.
Abstract:
The invention relates to an apparatus and to a method for detecting and/or quantifying mercuric ions, Hg2+.The apparatus of the invention is of the type comprising an electrical device comprising two electrodes and a substrate comprising at least one surface made of an organic or inorganic semiconductor material, the electrodes being in electrical contact with said organic or inorganic semiconductor material, and a device for measuring the variation in the conduction current between the two electrodes, and wherein at least one compound which complexes mercuric ions Hg2+, selected from a dithia-dioxa-monoaza crown ether compound, an N,N-di(hydroxyethyl)amine, an N,N-di(carboxyethyl)amine, and mixtures of two at least of these compounds, is bonded to said semiconductor material or to an electrode of said electrical device.The invention finds application in the field of the detection of mercuric ions, in particular.
Abstract:
The present invention relates to a process for producing carboxylic acids. It relates more particularly to a process for producing carboxylic acids by oxidation of a hydrocarbon with oxygen or a gas containing oxygen, and even more particularly to the oxidation of cyclohexane to adipic acid. The invention relates to a process for producing carboxylic acids by oxidation with oxygen or a gas containing oxygen of a cycloaliphatic hydrocarbon in the presence of an oxidation catalyst and of a monocarboxylic oxidation solvent that is lipophilic in nature, comprising a step of extraction of the dicarboxylic acids formed in the oxidation step, consisting in carrying out, in liquid phase, an extraction of the diacids using water.
Abstract:
The present invention relates to a process for producing carboxylic acids. It relates more particularly to a process for producing carboxylic acids by oxidation of a hydrocarbon with oxygen or a gas containing oxygen, and even more particularly to the oxidation of cyclohexane to adipic acid. It relates to a process comprising a step consisting of hydrolysis of the esters formed during the oxidation step.
Abstract:
The invention relates to an electronic device comprising at least two organic transistors having different threshold voltages. The device comprises at least two transistors, each including a self-assembled layer of molecules having dipole moments that differ from one another by an absolute value of between 0.2 and 10 debye. The invention is particularly suitable for use in the field of electronic circuit production.
Abstract:
The invention relates to an apparatus and to a process for the detection and/or quantification of cesium ions Cs+ in solution in a liquid medium.The apparatus of the invention comprises: a) an electrical device comprising two electrodes and a substrate comprising at least one portion made of a semiconductor material, the electrodes being in electrical contact with said semiconductor material; and b) a device for measuring the variation of the conduction current between the two electrodes, and at least one ligand comprising at least one calix[n]arene group bonded by grafting to the semiconductor material of the substrate of the electrical device or to one of the electrodes of the electrical device.The invention finds an application in the field of the detection of cesium ions in particular.
Abstract:
The present invention relates to a method and device for the detecting and/or electrically quantifying organophosphorus compounds as a gas or solution. The device includes: an electrical device including a source electrode and a drain electrode, separated by a semiconductor material; and a device for detecting positive charges between the two electrodes. One surface of the semiconductor material is in contact with a polymer material having at least one receptor group including: 1) a function X capable of reacting with the detectable organophosphorus compound, to form an intermediate grouping —Z; and 2) a function Y capable of reacting with —Z to form a positively charged ring. The polymer material includes molecular imprint cavities, with geometrical and chemical configuration allowing the detectable organophosphorus compounds to penetrate into said polymer material. The invention can be used in the field of detecting and/or quantifying organophosphorus compounds.