65 results about "Structural isomer" patented technology

Described herein are compounds and compositions characterized, in certain embodiments, by conjugation of various groups, such as lipophilic groups, to an amino or amide group of an amino acid, a linear or cyclic peptide, a linear or cyclic polypeptide, or structural isomer thereof, to provide compounds of the present invention, collectively referred to herein as “APPLs”. Such APPLs are deemed useful for a variety of applications, such as, for example, improved nucleotide delivery. Exemplary APPLs include, but are not limited to, compounds of Formula (I), (II), (III), (IV), (V), and (VI), and salts thereof, as described herein:

wherein m, n, p, R′, R¹, R², R³, R⁴, R⁵, R⁸, Z, W, Y, and Z are as defined herein.

A material for an organic electroluminescence device which can be a cis-isomer or a trans-isomer of structural isomers, the content of the trans-isomer being more than that of the cis-isomer. The ratio (t/c) of the trans-isomer (t) and the cis-isomer (c) is preferably 2 or more.

The method of at least one thermally expandable graphite intercalation compound, containing A) a least one metal halide of at least one of the elements Fe, Al, Sb, Zn, Y, Cr and Ni and B) at least one nitroalkane of the general formula CH3(CH2)nNO2, in which n is a whole number from 0 to 10, as well as its structural isomers or mixtures, as intumescing, fire-protection additive in polymer matrices for producing intumescing fire-protective seals for through holes, wall bushings and other openings in walls, floors and/or ceilings of buildings, as well as a method for preparing the thermally expandable graphite-intercalation compounds used.

The present invention relates to a process for producing phenol and a ketone of general formula R¹COCH₂R² (I), in which R¹ and R² each independently represent an alkyl group having from 1 to 4 carbon atoms, said process comprising: (a) providing an alkylbenzene feedstock comprising

(i) an alkylbenzene of general formula (II)

in which R¹ and R² have the same meaning as in formula (I) and

(ii) at least one structural isomer of said alkylbenzene of formula (II) in an amount of at least 0.7% of the weight of alkylbenzene of formula (II),

(b) submitting the alkylbenzene feedstock to oxidation conditions in the presence of oxygen and in the presence of a cyclic imide of formula (III):

in which X represents a carbonyl (CO) group or a sulfonyl (SO₂) group, n is 0, 1, 2, 3 or 4, R³ is one or several groups selected from a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an amino group and R⁴ is a hydrogen atom, an alkaline metal cation or an alkaline earth metal cation, or in the presence of N,N′,N″-trihydroxyisocyanuric acid (THICA), to produce a product comprising a hydroperoxide of general formula (IV)

in which R¹ and R² have the same meaning as in formula (I), and

(c) converting the hydroperoxide of formula (IV) into phenol and a ketone of formula (I).

The present invention provides a liquid detergent composition having high detergency without damaging styrene-based resin.The liquid detergent composition comprising (a) 0.1 to 50% by weight of a mixture of at least two different compounds from each other in view of their strutural isomers and/or their number of carbon atoms, selected from glyceryl-ether compounds having the formula (I): R-OCH2CH(OH)CH2OH (I) wherein R is an alkyl or alkenyl group having 1 to 11 carbon atoms; (b) 0.01 to 30% by weight of a surfactant; (c) 0.01 to 30% by weight of a builder or an alkali agent; and (d) the balance of water.

There are provided technologies for adsorbing a catalyst metal selectively to an anionic group such as a carboxyl group, thereby forming a metal film on a nonconductive resin selectively, including a palladium complex represented by the following formula (I):

wherein L represents an alkylene group and R represents an amino group or a guanidyl group, or a structural isomer thereof, a processing solution for electroless plating catalyst application containing the complex as an active component, and a method for forming a metal plated film on a nonconductive resin, containing subjecting a nonconductive resin having a surface anionic group to a catalyst adsorbing treatment using the processing solution and then to a reduction treatment, electroless metal plating, and metal electroplating.

The invention provides a spiropyrane solid photostimulation-response compound. The molecular chemical formula of the compound is shown in a formula (I). The invention discloses a preparation method and application of the solid fluorescence stimulation-response compound containing spiropyrane and tetraphenyl ethylene. The spiropyrane is a common photostimulation-response molecule, reversible structural isomerization between the spiropyrane as a colorless closed ring body and merocyanine as a colored open ring body can be generated, and due to high molecule accumulation of the spiropyrane in a solid state, the above-mentioned isomerization cannot easily occur; the typical aggregation-induced emission phenomenon occurs on the tetraphenyl ethylene, and the tetraphenyl ethylene is large in volume and provides the free volume for the spiropyrane, so that the isomerization of the spiropyrane in the solid state is facilitated; spacers are introduced between the tetraphenyl ethylene and the spiropyrane, which is beneficial for improvement of the luminous efficiency of the spiropyrane. In this way, the solid photochromic fluorescent molecular switch material is provided and has wide application prospects in the fields of photoswitch molecular devices, anti-fake application, optical information storage and the like.

The invention discloses a two-dimensional metal organic framework nanosheet-based capillary gas chromatography column and a preparation method and the application thereof. In an organic solvent, by taking zirconium tetrachloride as a metal source, taking 1,3,5-tri(4-carboxyphenyl)benzene as an organic ligand and taking at least one of formic acid, benzoic acid and p-aminobenzoic acid as an acid regulator, the metal and the organic ligand are self-assembled to form a nanosheet which is activated in vacuum, and then the inner wall of a capillary column is coated with the nanosheet to prepare thecapillary gas chromatography column, so that a substituted benzene isomer mixture can be efficiently separated to show unique para-isomer selectivity, which greatly improves the separation degree bycompared with a commercial column meta/para-substituted benzene structural isomer; baseline separation can be achieved for mixed straight-chain alkane and mixed benzene series; in addition, the nanosheet of a multilayer stack structure is an important reason for efficient separation of the isomers. The capillary gas chromatography column disclosed by the invention has excellent properties of wideapplication range, high selectivity, high thermal stability and the like.

Polymers, particularly those used in pressure-sensitive adhesives, are prepared from a mixture of structural isomers of a secondary alkyl (meth)acrylate monomer. The mixture is made by dehydrating a biobased C2-C22 alcohol with a first acid catalyst using a continuous process to form a mixture of olefins, and reacting (meth)acrylic acid with at least some of the mixture of olefins in the presence of a second acid catalyst. The adhesives are characterized by exhibiting an overall balance of adhesive and cohesive characteristics, and containing biobased material.

The invention relates to a method of statistically analyzing protein peptide bond cis and trans structures, and belongs to the fields of protein structure analysis, structure prediction and cis and trans configuration isomerism research. The method is mainly characterized in that protein peptide planar carbon, nitrogen and oxygen atoms are used for setting up a coordinate frame, the longitude and latitude angles, in the unit sphere, of the atoms to be inspected are calculated, and all the atoms to be inspected are projected to the unit sphere to obtain a three-dimensional statistic distribution diagram of the atoms to be inspected. The visual protein structure analysis method can effectively express difference in peptide bond cis and trans structures and disclose the distribution characteristics of the atoms in the peptide bond cis and trans structures. The method is more novel than the existing method based on the structural chemistry, is capable of analyzing the structural characteristics of any side chain atoms and visually expressing geometric structure characteristics of certain atom or certain kinds of atoms in protein and is of important significance in protein structure predicting, structure optimizing, structure constraining and cis and trans configuration isomerism analyzing.

The invention discloses a method for producing 1,2,4-trimethylbenzene by C9 aromatic hydrocarbon isomerization, belonging to the technical field of chemical industry. The method comprises the following steps of: dehydrogenizing the C9 aromatic hydrocarbon; then conveying hemimelitene, mesitylene and o-methyl ethylbenzene which are obtained by rectifying into an isomerization reactor; carrying outa catalysis reaction at a temperature in a range of 260-410 DEG C under 0.2-3.5 Mpa; isomerising parts of the hemimelitene and the mesitylene to form 1,2,4-trimethylbenzene; and rectifying and separating to obtain the 1,2,4-trimethylbenzene. The conversion per pass of the method provided by the invention can reach 45% and the method can produce much more 1,2,4-trimethylbenzene by utilizing the C9aromatic hydrocarbon.

The invention relates to a cooling agent and a synthesis method thereof. The synthesis method of the cooling agent comprises the following steps of 1, cleaning up a reactor by an ethanol solution, and removing air in the reactor, 2, adding an ethanol solution as a reaction solvent, umbelliferone and a Pd/C catalyst into the reactor, feeding hydrogen into the reactor, and heating for a reaction lasting for 6 to 8 hours, and 3, removing the Pd/C catalyst, adding NaBH4 into the product obtained by the step 2 for a sequential reaction, acidizing the reacted mixture obtained by the sequential reaction, carrying out extraction by ether to obtain extract, and carrying out reduced pressure distillation of the extract to obtain the cooling agent, wherein the cooling agent comprises four 1-isopropyl-4-methylbicyclo[3.1.0]-hexyl-2-alcohol structural isomers. The cooling agent has a gentle cool taste, long time of duration, obviously low irritation on the laryngeal, an obviously slight dry sensation, and a very strong moistening feel.

The invention discloses a measuring method of structural isomers of perfluorochemicals in an atmospheric particulate sampling membrane, and belongs to the technical field of environmental monitoring.The measuring method comprises the following steps of 1, sample extracting, wherein the atmospheric particulate sampling membrane is subjected to ultrasonic extraction, and thus an extraction solutionis collected and obtained; 2, sample purifying, wherein the extraction solution obtained in step 1 is purified, concentrated and repurified, and thus a sample detection solution is obtained; 3, sample measuring, wherein the sample detection solution obtained in step 2 is detected by an ultra-performance liquid chromatography-triple quadrupole tandem mass spectrometer, quantitative calculation isconducted through an internal standard method, and thus the content of the structural isomers of the perfluorochemicals in the atmospheric particulate sampling membrane is obtained. By the adoption ofthe measuring method, the structural isomers of the perfluorochemicals in the atmospheric particulate sampling membrane are sufficiently extracted and measured.

The invention discloses a method for improving the structural isomerism catalytic activity of a CE enzyme and a mutant thereof, and belongs to the field of enzyme engineering. According to the invention, cellobiose epimerase (CsCE) derived from Caldicellosirutorschcharlyticus is taken as a research object, site-saturation mutagenesis is carried out on a site related to substrate binding based on a semi-rational strategy of sequence alignment and crystal structure analysis, a plurality of mutants with obviously improved structural isomerism catalytic activity are obtained, and the structural isomerism activity of the mutants is improved by about 36-232% than that of a wild type CE enzyme. The invention provides a feasible scheme for CE enzyme improvement, and has important significance for promoting enzymatic industrial synthesis of lactulose.

Polymers, particularly those used in pressure-sensitive adhesives, are prepared from a mixture of structural isomers of a secondary alkyl(meth)acrylate monomer. The adhesives are characterized by exhibiting an overall balance of adhesive and cohesive characteristics and exceptional adhesion to low surface energy substrates.