10 results about "Imine ligands" patented technology

The invention provides an alpha-diimine ligand compound, an alpha-diimine nickel catalyst and a preparation method and application of the alpha-diimine ligand compound and the alpha-diimine nickel catalyst, and belongs to the technical field of organic synthesis. Wherein R1 is selected from hydrogen, methoxyl or tertiary butyl; r2 is selected from methyl, ethyl or isopropyl; and R3 is selected from hydrogen or methyl. The alpha-diimine nickel catalyst prepared by adopting the alpha-diimine ligand compound can catalyze olefin to carry out homopolymerization reaction or copolymerization reaction, so that not only is excellent catalytic performance shown, but also a polyolefin material obtained by catalyzing olefin monomer homopolymerization reaction has excellent elastic recovery performance; and the catalyst has certain application potential in olefin polymerization industry.

The present application relates to the technical field of nickel-based catalyst, and discloses a diimine ligand, a preparation method and application thereof, wherein the raw materials for preparing the diimine ligand contain acenaphthenequinone, a protective agent, substituted aniline and a catalyst, the protective agent is selected from one or more than two of ortho ester, amine, hydrazine and substituted hydrazine; and the molar ratio of the acenaphthenequinone, the protective agent, the substituted aniline and the catalyst is 1:(0.5-3):(1.6-2.4):(0.1-10). In the present application, a certain amount of protective agent is added to the reaction system, the acenaphthenequinone is reacted with the ortho ester or low-molecular-weight amine to generate ketal or imine, the ketal or imine is separated or not separated, and then reacted with the substituted aniline to generate the target product diimine ligand, no water is generated in the synthesis reaction of the diimine ligand, the balance can be effectively promoted to the forward reaction, and the reaction yield is improved.

This invention discloses a chiral oxazoline-pyridine-imine cobalt compound, its synthesis method, and its applications. The synthesis method involves the condensation reaction of 2-cyano-6-acetylpyridine and an aniline derivative with p-toluenesulfonic acid to generate a pyridine-imine compound. This compound is then cyclized with different chiral amino alcohols in the presence of zinc trifluoromethanesulfonate to generate chiral oxazoline-pyridine-imine ligands. The reaction of these ligands with anhydrous cobalt chloride successfully prepared four chiral oxazoline-pyridine-imine cobalt compounds. The cobalt catalyst synthesized in this invention possesses different chiral groups, electronic effects, and steric hindrance, and can catalyze the polymerization of isoprene.

This description provides titanium complexes containing 1) a cyclopentadienyl ligand; 2) an adamantyl-phosphinimine ligand; and 3) at least one activatable ligand. The use of the complex, in combination with an activator, as an olefin polymerization catalyst is demonstrated. The catalysts are effective for the copolymerization of ethylene with an alpha olefin (such as 1-butene, 1-hexene, or 1-octene) and enable the production of high molecular weight copolymers (Mw greater than 25,000) with high productivity under solution polymerization conditions.

The invention provides a method for preparing chiral sulfinic acid thioester through asymmetric oxidation, which is characterized in that a disulfide compound is used as a raw material, a chiral aminoindanol-derived alloxan compound is used as a chiral catalyst, hydrogen peroxide or oxygen is used as an oxidant, and the chiral sulfinic acid thioester is prepared through asymmetric oxidation. Compared with a traditional chiral imine ligand matched with a vanadyl acetylacetonate catalyst, an aminoindanol-derived alloxan compound is used as a chiral small-molecule catalyst, so that the chiral small-molecule catalyst has higher catalytic stability and high optical purity of a product, is not influenced by factors such as the stirring speed, the shape and size of a reaction bottle and the like, and is convenient for engineering amplification; meanwhile, compared with a chiral resolution method, the method for synthesizing the chiral sulfinic acid thioester in one step by using a chiral small molecule catalysis method has higher step economy, and the method is simple to operate, high in raw material conversion rate, good in reaction enantioselectivity, high in product yield and high in optical purity.

The invention belongs to the field of sewage treatment, and particularly relates to an acrylonitrile production wastewater treatment process. Comprising the following steps: preparing a nickel catalyst by using a salicylaldehyde imine ligand and nickel salt; then loading a nickel catalyst on the magnetic carrier to obtain a magnetic catalyst; removing dissolved oxygen in the wastewater, treating the wastewater by adopting a magnetic catalyst, and promoting monomer polymerization in the wastewater; and the magnetic catalyst is separated in a magnetic suction separation manner. The process disclosed by the invention can promote olefin polymerization and sedimentation and reduce the activity and toxicity of the wastewater, is simple to operate and does not need special equipment.

The invention belongs to the technical field of catalysis, and particularly relates to a sandwich-type alpha-diimine ligand, a preparation method thereof, a nickel catalyst and a preparation method and application thereof. The sandwich-type alpha-diimine ligand provided by the invention has a structure shown as a formula (I), and in the formula (I), R1 is perfluoro-n-butyl or n-butyl, and R2 is hydrogen or tert-butyl. The nickel catalyst prepared from the ligand disclosed by the invention can present two different configurations in ethylene polymerization to realize double active centers, so that wide-distribution bimodal polyethylene can be produced in a single reactor. Formula (I).

The application belongs to the technical field of olefin polymerization catalysts, and provides a phenylthiol imine group IV metal complex, a preparation method and application, which is a complex of a thiol imine ligand and a group IV metal. n BuLi, elemental S and a group IV metal halide MX4 are reacted with each other to obtain the phenylthiol imine group IV metal complex. The phenylthiol imine group IV metal complex is simple to synthesize, can be used to catalyze ethylene homopolymerization at high activity to obtain low to high molecular weight polyethylene, and can be used to catalyze ethylene and alpha-olefin polymerization at high activity to obtain high-performance polyolefin products.

The present disclosure provides a polynuclear diimine ligand compound, a polynuclear diimine catalyst and a preparation method and application thereof, and belongs to the technical field of polyolefins. The polynuclear diimine ligand compound has a structure as shown in formula (I), wherein R1 and R2 are each independently selected from hydrogen, methyl, ethyl, C3-C8 isomerized alkyl, benzhydryl, methoxy, 4-tert-butylphenyl and biphenyl; and R3 is selected from hydrogen, methyl, ethyl, methoxy, C3-C8 isomerized alkyl, halogen and nitro. Formula (I).

The invention provides a preparation method of an enantiomer-enriched amino alcohol compound, which comprises the following steps: by taking 2-nitropropane and fatty aldehyde as raw materials, carrying out Henry reaction under the action of a catalytic system to obtain an enantiomer-enriched nitro alcohol compound; and reducing to obtain the enantiomer-enriched amino alcohol compound. A catalytic system composed of an efficient chiral imine ligand and a metal catalyst is adopted to catalyze 2-nitropropane and fatty aldehyde to be subjected to asymmetric Henry reaction, and a nitro alcohol intermediate is constructed with high enantioselectivity; and reducing nitryl through catalytic hydrogenation to obtain amino alcohol products with high enantiomer enrichment. Reaction conditions are mild, operation is simple, raw materials are easy to obtain, yield is high, and the method is suitable for large-scale production; a green solvent is used in the reaction process, byproducts are few, and the method is environment-friendly and conforms to the green chemistry principle. The whole process route is simple and efficient, and a feasible new way is provided for industrial preparation of enantiomer-enriched amino alcohol compounds.