Identification de sources électromagnétiques multipolaires par filtrage spatial : simplification du contour des capteurs

National audienceNew sensors of magnetic induction in near field, dedicated to studies of ElectroMagnetic Compatibility (E.M.C.), are proposed according to the principle of the Standard CISPR16-1 coils. The new coil shape allows the sensors to be sensitive to only some specific components of the multipolar expansion, which is similar to a spatial filtering. Our proposition follows previous works and just focuses on the concept of shape coils simplification. By means of rotations of the reference frame, our aim is to simplify the geometry of the sensor coils introduced before. After a description of the tools required, the design method is described.De nouveaux capteurs d’induction magnétique en champ proche, dédiés aux études de Compatibilité ElectroMagnétique (C.E.M.), sont proposés sur le principe des spires de la norme CISPR16-1. La forme des bobines proposées leur permet de n’être sensibles qu’à certaines composantes multipolaires du champ, ce qui réalise un filtrage spatial. L’exposé fait suite à des travaux antérieurs et se concentre exclusivement sur la méthode de simplification des contours de détection. A l’aide de rotations du repère de référence, il s’agit de simplifier la géométrie des bobines du capteur proposé précédemment. Après un exposé des outils utilisés, la méthode de synthèse de ces nouveaux contours est décrite

catalysts for nucleophilic substitution, synthesis thereof, composition containing them and use thereof

the invention concerns novel catalysts for aromatic nucleophilic substitution. Said catalysts are compounds of the general formula (I), wherein: R.sub.1, R.sub2, R.sub.3, R.sub.4, R.sub.5, and R.sub.6, identical or different, are selected among hydrocarbon radicals; the Pn's, advantageously the same, are selected among metalloid elements of column V of a period higher than nitrogen; Z is a metalloid element of column V, advantageously distinct from Pn; preferably a nitrogen (N, P, As, Sb). The invention is applicable to organic synthesi

Capteurs de composantes multipolaires pour une caractérisation en champ proche

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Coils Sensors Design for Near Field Multipolar Expansion Identification

International audienc

Multipolar Expansion Sensors For Near Field Characterization

International audienc

Reactions of (chlorodifluoromethyl)benzene and (chlorodifluoromethoxy)benzene with nucleophilic reagents

Condensation reactions of (chlorodifluoromethyl)benzene and (chlorodifluoromethoxy)benzene with phenoxide and thiophenoxide ions have been performed in DMF or NMP with heating. In these conditions, the reaction between phenylselenide ion and (chlorodifluoromethyl)benzene did not occur. This latter reaction requires an additional visible light irradiation to proceed, as reported by Yoshida et al

Process for arylating or vinylating or alkynating a nucleophilic compound

The present invention concerns a process for arylating or vinylating or alkynating a nucleophilic compound. More particularly, the invention concerns arylating nitrogen-containing organic derivatives. The arylating or vinylating or alkynating process of the invention consists of reacting a nucleophilic compound with a compound carrying a leaving group and is characterized in that the reaction is carried out in the presence of an effective quantity of a catalyst based on a metallic element M selected from groups (VIII), (Ib) and (IIb) of the periodic table and at least one ligand comprising at least one imine function and at least one supplemental nitrogen atom as the chelating atoms. The present invention concerns a process for arylating or vinylating or alkynating a nucleophilic compound. More particularly, the invention concerns arylating nitrogen-containing organic derivatives. The arylating or vinylating or alkynating process of the invention consists of reacting a nucleophilic compound with a compound carrying a leaving group and is characterized in that the reaction is carried out in the presence of an effective quantity of a catalyst based on a metallic element M selected from groups (VIII), (Ib) and (IIb) of the periodic table and at least one ligand comprising at least one imine function and at least one supplemental nitrogen atom as the chelating atoms

Activation of Nucleophilic Fluorination by Salts in Ionic Liquids and in Sulfolane

The nucleophilic substitution of PhCCl3 by KF in imidazolium-type RTILs is faster than in classical organic solvents but it is strongly dependent upon the nature of the counteranion. The addition of bromide salts in substoichoimetric amounts to the [bmim][PF6] solvent strongly accelerates this reaction. Furthermore, it has been discovered that addition of KPF6 to the reaction mixtures strongly activates the nucleophilic fluorination by KF, not only in the [bmim][NTf2] or [bmim][PF6] ionic liquids but also for the reactions performed in sulfolane