216 results about "Stereospecificity" patented technology

This invention provides a catalys conponent and catalyst. Said catalyst comprises titanium, magnesium and at least three electron donor compounds a, b and c, in which is selected from mono-aliphatic-carboxylate or mono-aromatic-carboxylate compounds, b is selected from a special diatomic alkoxide compound, and c is selected from binary binary-aliphatic-carboxylate or binary-aromatic-carboxylate or b is ether compound. Advantages: high polymerization activity and stereospecificity when used for olefin polymerization, in particular for propylene polymerization, wide molecular weight distribution of obtained polymer and good shape of polymer granulars.

The invention provides catalyst components used for CH2=CH olefin polymerization reaction and a catalyst, wherein R is alkyl or aryl of hydrogen or C1-C6. The catalyst components comprise magnesium, titanium, halogen and electron donors. The electron donors are at least one of amine ester compounds presented as the following general formula (I), wherein, R1 is the aryl or alkaryl of C6-C20; R2 and R3 can be the same or different, which are the alkyl of the hydrogen or a straight chain or a branched chain of the C1-6, and the aryl, aralkyl, ester group or acyl of the C6-C20, but R2 and R3 can not be the hydrogen at the same time. A is a divalent linking group whose chain length is 1 to 15 carbon atoms. Hydrogen atoms on the divalent linking group can be substituted by the alkyl, amino-alkane or the acyl. When the catalyst is used in propylene polymerization, a satisfied polymerization yield can be obtained, and the polymer is in higher stereospecificity and is helpful to develop the different grades of the polymers.

The present invention is to provide a composite carrier, which is spheric particles obtainable by contacting magnesium halide with one or more electron donor compounds to form a solution, then mixing the solution with silica material having an average particle size of less than 10 microns to form a mixture, and drying the mixture through spray drying process. The present invention is also to provide a catalyst component comprising said composite carrier. When the catalyst component is used together with a cocatalyst component in propylene polymerization, it exhibits higher polymerization activity and stereospecificity, and can be used to prepare high impact resistant ethylene-propylene copolymer having high ethylene content.

The present disclosure relates to the preparation of a cannabidiol compound or a derivative thereof. The cannabidiol compound or derivatives thereof can be prepared by an acid-catalyzed reaction of a suitably selected and substituted di-halo-olivetol or derivative thereof with a suitably selected and substituted cyclic alkene to produce a dihalo-cannabidiol compound or derivative thereof. The dihalo-cannabidiol compound or derivative thereof can be produced in high yield, high stereospecificity, or both. It can then be converted under reducing conditions to a cannabidiol compound or derivatives thereof.

The present invention relates to the field of olefin polymerization, and particularly provides a catalyst component for olefin polymerization, and a preparation method thereof, and a catalyst for olefin polymerization, and applications thereof. The catalyst component for olefin polymerization contains the product obtained by carrying out a reaction on a solid component, at least a titanium compound and an internal electron donor, wherein the internal electron donor contains a phosphate compound and a diether compound, the phosphorus content (calculated as the phosphorus element) in the catalyst component is not more than 0.06 wt% by using the total weight of the catalyst component as the reference, and the solid component contains a magnesium compound represented by a formula (1) and an alkylene oxide compound represented by a formula (2). According to the present invention, the catalyst component does not contain phthalate compounds (plasticizers), has high hydrogen response sensitivity and high stereospecificity, and can be used in olefin polymerization so as to obtain the polymer having narrow molecular weight distribution. The formulas (1) and (2) are defined in the specification.

The invention provides a catalyst for propene polymerization, which comprises the following components: A, a titanium-containing solid catalyst component, B, an alkylaluminium compound, and C, an organosilicone compound; and the invention also provides a method for preparing the titanium-containing solid catalyst component A. The titanium-containing solid catalyst component comprises titanium, magnesium, halogen, a surface modifier and a polyol ester compound with a special structure, or the polyol ester compound with the special structure which is taken as an electron doner and an electron doner compound with another structure are reasonably compatible with each other and are used in a catalyst system which is modified by the surface modifier to prepare a catalyst component and a catalystwith better comprehensive performance. Particularly, the catalyst provided by the invention shows high polymerization activity and stereospecificity when used for olefin polymerization, in particularthe propene polymerization; and simultaneously, the prepared polymer has wide molecular weight distribution and more facilitates the processing and application.

The invention provides a catalyst component for olefin polymerization. The catalyst component contains the reaction product of a magnesium compound, a titanium compound, a phosphorus-containing compound and a phosphorus-free internal electron donor compound. The phosphorus-containing compound is added in a step except the step of magnesium compound dissolution, and the catalyst component has a phosphorus content of 0.4-3.0wt%. The involved catalyst has strong stereospecificity and good hydrogen regulation sensitivity. When the catalyst is used for olefin polymerization, especially propylene polymerization, a product with a high isotactic index, a high melt flow rate and a low dimethylbenzene soluble substance content can be obtained simultaneously. Especially when the catalyst is used for propylene polymerization under a high hydrogen concentration condition, the obtained polymer can have a high melt flow rate, a high isotactic index and a low dimethylbenzene soluble substance content, and at the same time, the polymer has a relatively narrow molecular weight distribution.

The invention discloses a catalytic component for olefin polymerization, which uses at least one maleic acid ester in a general formula (I) as an internal electron donor, and is used for olefin polymerization, particularly for propylene polymerization (copolymerization) so as to obtain a high-stereospecificity polymer. Meanwhile, the invention also discloses a catalyst containing the catalytic component.

The invention provides a catalyst component for olefin polymerization and application of the catalyst component. The catalyst component contains a product obtained by reacting a magnesium halide adduct, a titanium compound and at least one optional internal electron donor compound, wherein the magnesium halide adduct is shown as MgX<1>Y-mEtOH-n(LB1)-k(LB2)-p(LB3). The invention also provides a catalyst system for olefin polymerization and application of the catalyst system. The catalyst system contains the catalyst component and one or more organic aluminum compounds. The invention also provides an olefin polymerization method. The method comprises the following step of: contacting one or more olefins and the catalyst system under the condition of olefin polymerization. The catalyst system has high hydrogen regulation sensitivity and stereospecificity in olefin polymerization, and good balance between the hydrogen regulation sensitivity and the stereospecificity of the catalyst system is achieved.

the invention provides a catalyst component for CH2ú¢CHR olefin polymerization reaction and its catalyst, wherein R is hydrogen or C1-C6 alkyl or aryl radical; such component comprising magnesium, titanium, halogen and electron donor, such electron donor is more than one kind diester of such formula (I), wherein Ríõ is the same with or different from R1, extracted from C1-C20 alkyl, cycloalkyl, aryl radical, alkylaryl, aralkyl, alkylene, condensed-nuclei aryl radical of substituted or unsubstituted straight/branched chain; such catalyst can be used for propylene polymerization, to get satisfied productivity, and high stereospecificity of polymers, with wide molecular weight distribution, which is good for developing polymers with different brands.

The present invention relates to the field of olefin polymerization, and particularly provides a catalyst component for olefin polymerization, and a preparation method thereof, and a catalyst for olefin polymerization, and applications thereof. The catalyst component for olefin polymerization contains the product obtained by carrying out a reaction on a magnesium source, a titanium source and an internal electron donor, wherein the internal electron donor contains a phosphate compound and a diether compound, and by using the total weight of the catalyst component as the reference, the phosphorus content (calculated as the phosphorus element) in the catalyst component is not more than 0.06 wt%. According to the present invention, the catalyst component does not contain phthalate compounds (plasticizers), has high hydrogen response sensitivity and high stereospecificity, and can be used in olefin polymerization so as to obtain the polymer having narrow molecular weight distribution.

The invention relates to an olefinic-polymerized catalytic composition, which adopts at least one succinate in a general formula (I) as an internal electron donor. The catalytic composition is used for olefin, and can obtain a polymer with quite high stereospecificity particularly when propylene is copolymerized. The invention also discloses a catalyst containing the catalytic composition.

The invention relates to a solid catalyst component for olefin polymerization and a catalyst. The solid catalyst component is prepared by the following steps of: contacting magnesium dialkoxyl serving as a carrier and toluene serving as a dispersant with a 2,3-di-non-straight chain alkyl-2-cyanodiethyldiester compound which is taken as an electron donor, has a special structure and is shown as a general formula (I), controlling at a certain temperature for reacting with titanium halide, and performing the titanium halide treatment to obtain the solid catalyst. During polymerization, an organic aluminum compound is taken as a catalyst accelerator, and a compound of organic silicon is taken as a steric directing agent. When the catalyst is applied to propylene polymerization, an obtained polymer has the advantages of wide molecular weight distribution, high stereospecificity, good particle form and low fine powder content, and is suitable for products having high requirements on the processing performance of polymers.

The invention provides a catalyst component for olefin polymerization. The catalyst component contains magnesium, titanium, halogen, phosphorus and an internal electron donor compound. The phosphorus content is 0.3-3.0wt%, and the internal electron donor compound contains at least one diol ester compound selected from the general formula (I) shown in the description. The involved catalyst has high stereospecificity and very good hydrogen regulation sensitivity. When the catalyst is used for olefin polymerization, especially propylene polymerization, a product with high polymerization activity, a high isotactic index and a high melt flow rate can be obtained. The catalyst is especially suitable for preparation of products with a high melt flow rate and an enhanced isotactic index under a high hydrogen concentration condition.

The invention discloses a method for preparing chiral polyaniline in an anionic-surfactant-containing acidic water solution by protein induction. The method comprises the following steps: respectively adding an anionic surfactant and aniline monomer into a citric acid-disodium hydrogen phosphate buffer solution with the pH value of 1-3, and mixing and stirring; adding a protein water solution into the system; and stirring uniformly, adding a hydrogen peroxide or ammonium persulfate solution, and stirring at normal temperature to react for some time, thereby obtaining the chiral polyaniline. In the method, the protein is used as a chiral inducer to prepare the chiral polyaniline, and the chiral inducer has the advantages of wide sources and low price; the required experimental conditions are simple, mild and environment-friendly; and the obtained chiral has the advantages of high stereospecificity and high yield, and has potential large-scale application value.

The present invention relates to the field of olefin polymerization, particularly provides a catalyst for olefin polymerization, a preparation method and applications thereof. The catalyst for olefinpolymerization contains (i) a catalyst component, (ii) at least an alkyl aluminum compound and (iii) an external electron donor, wherein the catalyst component contains the product obtained by carrying out a reaction on a magnesium source, a titanium source and an internal electron donor, the internal electron donor contains a phosphate compound and a diether compound, the phosphorus content (calculated as the phosphorus element) in the catalyst component is not more than 0.06 wt% by using the total weight of the catalyst component as the reference, and the external electron donor has a structure represented by a formula (1). According to the present invention, the catalyst does not contain phthalate compounds (plasticizers), has high hydrogen response sensitivity and high stereospecificity, and can be used in olefin polymerization so as to obtain the polymer having narrow molecular weight distribution. The formulas (1) is (R17)x(R18)ySi(OR19)z.

The invention supplies a catalyst constituent used in alkene polyreaction. It includes magnesium, titanium, halogen and electron supplying identity. The electron supplying identity contains at least one of acetal or ketal compounds. When using in olefinic polymerization, the polymerizing yield could be satisfied. And the stereospecificity of the polymer is high.

The invention provides a solid catalyst component for olefin polymerization, which comprises Mg, Ti, halogen and electron donor, wherein the electron donor is selected from at least one of cyclosubstituted ether acid ester compounds disclosed as general formula (I) and at least one of ether, ester, ketone or amine single-function group or polyfunctional group electron donor compounds. The invention also provides a catalyst containing the solid catalyst component and application of the catalyst in olefin polymerization reaction, particularly application in propylene polymerization reaction. The specific cyclosubstituted-structure compounds contained in the solid catalyst component have a steric effect, can fix the spatial configuration of the ether and acid ester functional groups, and have active functions on participating in the formation of the catalyst activity center and enhancing the stereospecificity of the catalyst. The solid catalyst component with excellent activity can be used for obtaining the polymer product with high degree of isotacticity.

The invention relates to a preparation method of an antiviral drug Entecavir. Taking D-glucose and acetone as starting materials, the method has advantages of easy operation, high yield, easy separation and purification, wide source of raw materials and low cost. The selectivity and stereospecificity are controlled at the beginning of a reaction to effectively inhibit the production of chiral isomer. The purification method of product is simple with high yield. A key intermediate of the reaction is 4- methylol-5- methylene cyclopentane-1,3-diol, of which 4- methylol is selectively protected by trityl chloride, and the intermediate combines with 2-amino-6-chloropurine by mitsunobu. Because of the steric hinderance effect, the protecting group can effectively protect target group and the operation is easy to carry out while removing the protecting group.

The present relates to LNA gapmer antisense oligonucleotides which comprise stereodefined phosphoramidite linkages. The use of stereodefined phosphoramidite linkages in LNA gapmers has been found to provide enhanced RNaseH activity, and modifying stereospecificity enables the reduced toxicity, altered biodistribution, and enhanced mismatch discrimination.