Abstract:
The inventive concepts disclosed and/or claimed herein relate generally to catalysts and, more particularly, but not by way of limitation, to a heterogeneous, metal-free hydrogenation catalyst containing frustrated Lewis pairs. In one non-limiting embodiment, the heterogeneous, metal-free catalyst comprises hexagonal boron nitride (h-BN) having frustrated Lewis pairs therein.
Abstract:
The present invention relates to compounds of the formula I in which the parameters have the respective meanings given in the description, to the use thereof for high-frequency components, to liquid-crystalline media comprising the compounds, and to high-frequency components, in particular antennae, especially for the gigahertz range, comprising these media. The liquid-crystalline media serve, for example, for the phase shifting of microwaves for tunable ‘phased-array’ antennae.
Abstract:
A photorefractive composite, a spatial light modulator and a hologram display device using the same include at least one carborane compound expressed as the following Chemical Formulae 1A through 1C: wherein the photorefractive composite exhibits photoconductivity and optical nonlinearity.
Abstract:
This invention relates to methods, compositions, and apparatuses for producing macrocyclic compounds. First, one or more reactants are provided in a reaction medium, which are capable of forming the macrocyclic compound through a desired reaction pathway that includes at least cyclization, and which are further capable of forming undesired oligomers through a undesired reaction pathway that includes undesirable oligomerization. Oligomerization of such reactions in the reaction medium is modulated to reduce formation of undesired oligomers and/or to reduce separation of the undesired oligomers from the reaction medium, relative to a corresponding unmodulated oligomerization reaction, thereby maximizing yields of the macrocyclic compound. The macrocyclic compound so formed is then recovered from the reaction medium. Preferably, the macrocyclic compound spontaneously separates from the reaction medium via phase separation. More preferably, the macrocyclic compound spontaneous precipitates from the reaction medium and therefore can be easily recovered by simple filtration.
Abstract:
The fluid for traction drive containing:(A) an alkane derivative having at least three cyclohexane rings in a molecule; and(B) an alkane derivative having a main chain of two or three carbon atoms, to which at least two methyl groups are bonded, and having two cyclohexane rings in a molecule each bonded to one of the terminal carbon atoms of the alkane, or a cyclopentane derivative having two cyclohexane rings in a molecule, and which has a kinematic viscosity of at least 3 centistokes at 100.degree. C.The fluid has a high traction coefficient with stability over a wide range of temperature.
Abstract:
Highly selective oxidative coupling of aromatic methyl groups, such as coupling toluene to DPE, is effected under mild, liquid phase conditions with a peroxodisulfate without expensive metal ion catalysts, in presence of substantial amounts, preferably equimolar, of methyl, ethyl or benzyl substituted quaternary ammonium salts. A continuous process is possible by electrolytic regeneration of the spent oxidant.
Abstract:
AN IMPROVED METHOD OF TRANSMITTING POWER IN HYDRAULICALLY-OPERATED MECHANISMS WHICH COMPRISES USING AS THE OPERATIVE FLUID CERTAIN TETRAALYKYL SUBSTITUTED ALKYLENE-LINKED DICYCLOHEXYL COMPOUNDS.
Abstract:
ETHYLBENZENE AND BENZENE ARE PRODUCED FROM TOLUENE BY A UNIQUE PROCESS WHICH COMPRISES FIRST COUPLING THE TOLUENE UNDER THE INFLUENCE OF HEAT, USING ELEMENTAL SULFUR. THE PRODUCTS OF THE COUPLING REACTION ARE BIBENZYL, STILBENE AND SOME SULFUR-CONTAINING COMPOUNDS. THE ENTIRE PRODUCT OF THE COUPLING REACTION IS THEN SUBJECTED TO A COMBINED HYDRODESULFURIZATION AND HYDROALKYLATION REACTION TO PRODUCE ETHYLBENZENE AND BENZENE AS THE ULTIMATE MAJOR PRODUCTS.
Abstract:
Compounds of formula I their use in liquid-crystalline media, for example, for the phase shifting of microwaves for tunable phased-array antennae, and their use for high-frequency components, in particular antennae, especially for the gigahertz range.
Abstract:
A composition comprising an ethylene-based polymer is made by a process comprising the steps of: (A) contacting under first polymerization conditions at least ethylene and at least one molecular catalyst to form a first ethylene-based polymer, and (B) contacting under second polymerization conditions the first ethylene-based polymer of (A) with at least additional ethylene and a carbon-carbon free radical initiator of Structure (I): wherein R1, R2, R3, R4, R5 and R6 are each, independently, hydrogen or a hydrocarbyl group and wherein, optionally, two or more R groups (R1, R2, R3, R4, R5 and R6) form a ring structure, with the proviso that at least one of R2 and R5, and at least one of R3 and R6 is a hydrocarbyl group of at least two carbon atoms, to form the composition.