Abstract: The present invention relates to an iminium salt having the following formula (I) and also to a ruthenium complex having the following formula (II): as well as the use of said ruthenium complex as catalyst, in particular in olefin metathesis.

Abstract: The present invention relates to an optically pure (+) or (?) enantiomer of a ruthenium complex having formula (I) as well as the preparation method of said enantiomer, and uses thereof as catalyst, in particular in asymmetric olefin metathesis.

Abstract: The present invention relates to a process for the preparation of an optically pure (+) or (?) enantiomer of an iminium salt having the formula (I), aid process comprising the following steps: a) a reduction step of an iminium salt having the formula (II), said salt being in the form of a racemic mixture, in order to obtain a compound having the formula (III) in the form of a racemic mixture, b) a step of chiral HPLC separation of the compound of formula (III) in the form of a racemic mixture, for obtaining an optically pure (+) or (?) enantiomer compound having the formula (IV), and c) an oxidation step of the compound of formula (IV) for obtaining the compound of formula (I).

Abstract: The present invention relates to an optically pure (+) or (?) enantiomer of a ruthenium complex having formula (I) as well as the preparation method of said enantiomer, and uses thereof as catalyst, in particular in asymmetric olefin metathesis.

Abstract: A piezoelectric hydrophone with perforations and an array comprising a plurality of hydrophones comprises a stack of layers that are bonded to one another, the layers comprising at least one piezoelectric layer and a plurality of layers referred to as rigid layers, at least two of which are electrode layers, the rigid layers exhibiting a stiffness perpendicularly to the direction of stacking, which stiffness is higher than the stiffness of the piezoelectric layer perpendicularly to the direction of stacking. At least one piezoelectric layer comprises a central zone comprising a set of perforations that pass through the piezoelectric layer solely along the direction of stacking, each perforation being closed tight by closure elements comprising portions of two of the rigid layers, the two rigid layers extending over the entirety of the surface of the central zone.

Abstract: A piezoelectric hydrophone with perforations and an array comprising a plurality of hydrophones comprises a stack of layers that are bonded to one another, the layers comprising at least one piezoelectric layer and a plurality of layers referred to as rigid layers, at least two of which are electrode layers, the rigid layers exhibiting a stiffness perpendicularly to the direction of stacking, which stiffness is higher than the stiffness of the piezoelectric layer perpendicularly to the direction of stacking. At least one piezoelectric layer comprises a central zone comprising a set of perforations that pass through the piezoelectric layer solely along the direction of stacking, each perforation being closed tight by closure elements comprising portions of two of the rigid layers, the two rigid layers extending over the entirety of the surface of the central zone.

Abstract: The present invention provides novel and stable crystalline 1H-1,2,3 triazolium carbenes and metal complexes of 1H-1,2,3 triazolium carbenes. The present invention also provides methods of making 1H-1,2,3 triazolium carbenes and metal complexes of 1H-1,2,3 triazolium carbenes. The present invention also provides methods of using 1H-1,2,3 triazolium carbenes and metal complexes of 1H-1,2,3 triazolium carbenes in catalytic reactions.

Abstract: Described herein are compounds and methods of catalyzing ethenolysis reactions, optionally on an industrial scale. In certain embodiments, the catalysts bear cyclic alkyl amino carbene (CAAC) ligands with an ortho substituent, such as a methyl substituent, on an N-aryl ring. When used to catalyze ethenolysis reactions, certain such compounds produce a turnover number greater than 50,000.

Abstract: An X-ray machine is provided. The X-ray machine comprises an X-ray tube; an X-ray detector placed opposite the X-ray tube in a direction of emission of X-rays; and a mobile device on which the X-ray tube and the X-ray detector are mounted, the mobile device comprising a motor capable of causing the automatic movement of the X-ray machine, and an impact-sensing system coupled to the motor in order to control the movement of the mobile device in the event of an impact applied to the X-ray apparatus.

Abstract: Described herein are compounds and methods of catalyzing ethenolysis reactions, optionally on an industrial scale. In certain embodiments, the catalysts bear cyclic alkyl amino carbene (CAAC) ligands with an ortho substituent, such as a methyl substituent, on an N-aryl ring. When used to catalyze ethenolysis reactions, certain such compounds produce a turnover number greater than 50,000.

Abstract: Stable, bent allenes, organometallic complexes of bent allenes are provided along with methods of conducting chemical processes such as olefin metathesis, comprising contacting an olefin substrate with an organometallic complex as described herein, under suitable conditions.

Abstract: Methods are provided for the catalytic hydroamination of compounds having an alkyne or allene functional group, in which the compound is contacted with ammonia or an amine in the presence of a catalytic amount of a gold complex under conditions sufficient for hydroamination to occur.

Abstract: An X-ray machine is provided. The X-ray machine comprises an X-ray tube; an X-ray detector placed opposite the X-ray tube in a direction of emission of X-rays; and a mobile device on which the X-ray tube and the X-ray detector are mounted, the mobile device comprising a motor capable of causing the automatic movement of the X-ray machine, and an impact-sensing system coupled to the motor in order to control the movement of the mobile device in the event of an impact applied to the X-ray apparatus.

Abstract: The present invention provides novel and stable crystalline 1H-1,2,3 triazolium carbenes and metal complexes of 1H-1,2,3 triazolium carbenes. The present invention also provides methods of making 1H-1,2,3 triazolium carbenes and metal complexes of 1H-1,2,3 triazolium carbenes. The present invention also provides methods of using 1H-1,2,3 triazolium carbenes and metal complexes of 1H-1,2,3 triazolium carbenes in catalytic reactions.

Abstract: Amines and boranes are the archetypical Lewis bases and acids, respectively. The former can readily undergo one-electron oxidation to give radical cations, whereas the latter are easily reduced to afford radical anions. The present invention provides the synthesis of neutral tricoordinate boron derivatives, which act as a Lewis base, and undergoes one-electron oxidation into the corresponding radical cation. The present invention also provides borylene (H—B:) and borinylium (H—B+.) complexes stabilized by two cyclic (alkyl)(amino)carbenes. Ab initio calculations show that the HOMO [Highest Occupied Molecular Orbital] of the borane as well as the SOMO [Singly Occupied Molecular Orbital] of the radical cation are essentially a pair and a single electron in the p(?)-orbital of boron, respectively.

Abstract: The present invention provides metal-free abnormal N-heterocyclic carbenes, also known as imidazol-5-ylidenes and metal complexes of abnormal N-heterocyclic carbenes. The present invention also provides methods of making metal-free abnormal N-heterocyclic carbenes and metal complexes of abnormal N-heterocyclic carbenes. The present invention also provides methods of using metal-free abnormal N-heterocyclic carbenes and metal complexes of abnormal N-heterocyclic carbenes in catalytic reactions.

Abstract: Methods are provided for the catalytic hydroamination of compounds having an alkyne or allene functional group, in which the compound is contacted with ammonia or an amine in the presence of a catalytic amount of a gold complex under conditions sufficient for hydroamination to occur.

Abstract: Stable, bent allenes, organometallic complexes of bent allenes are provided along with methods of conducting chemical processes such as olefin metathesis, comprising contacting an olefin substrate with an organometallic complex as described herein, under suitable conditions.

Abstract: The invention provides for stable and isolable cyclopropenylidenes of Formula I and stable and isolable cyclopropenylidene-metal complexes of Formula II, and methods of making thereof.

Abstract: Stable carbene ligands are provided having a carbene center flanked by a quaternary carbon and an amino group, and having utility in the preparation of various transition metal complexes.