18 results about "Salen ligand" patented technology

The invention belongs to the field of organic synthesis, and particularly relates to a synthesis method of 2-chloro-3-hydrazinopyridine, which comprises the following steps: carrying out chlorination reaction on pyridine and N-chlorosuccinimide in the presence of FeCl3 and 1, 10-phenanthroline to generate 2, 3-dichloropyridine; the method comprises the following steps: reacting 2, 3-dichloropyridine with hydrazine hydrate in the presence of a Pd catalyst, a Salen ligand and alkali to generate 2-chloro-3-hydrazinopyridine; the method is mild in reaction condition, low in cost and good in safety, and has a good industrial production application prospect.

The invention belongs to the technical field of catalysts, relates to spiro Salen ligands as well as a preparation method and application thereof, and particularly relates to application of the spiro Salen ligands to preparation of degradable polyhydroxyalkanoate by catalyzing ring-opening polymerization of beta-butyrolactone. According to the invention, spiro-o-hydroxyaldehyde and dialdehyde are designed and synthesized and are applied to preparation of spiro-Salen ligands, so that the variety of the Salen ligands is enriched, and the derivation application range of spiro-compounds is widened. The invention also relates to ring opening polymerization participated by the ligand. By adopting a catalytic system formed by the Salen ligand and a yttrium metal precursor, the high-activity and high-selectivity poly-3-hydroxybutyrate with a regular stereostructure can be obtained. The method has the advantages that the catalyst is low in dosage and high in activity, the poly-3-hydroxybutyrate product has high syndiotactic degree, the defect that only isotactic products can be obtained by a biological method can be effectively overcome, and the method has industrial application value.

The invention discloses a Salen ligand, a carbene compound and a preparation method of the Salen ligand and the carbene compound, and belongs to the technical field of chemical synthesis. The chemical structural formula of the Salen ligand is shown as a formula I, and the formula I is # imgabs0 #; in the formula I, M comprises any one of Pd, Ni, Cu and Zn; r comprises any one of methyl, ethyl and n-butyl; r'comprises any one of C1-C5 alkyl, phenyl and biphenyl; and X comprises PF6. Salen and carbene are combined to realize concerted catalysis, stability enhancement and multifunctional integration, the structure adjustability and metal coordination capability of the Salen ligand are retained, high reaction activity and stability of carbene are introduced, a multifunctional composite system is formed, the catalytic activity of the single Salen ligand is remarkably improved, and the Salen ligand has a wide application prospect. The application field of the Salen ligand is widened, and the technical problem that Salen is rarely researched in the carbene field is solved.

The invention discloses a Schiff base cobalt complex, a preparation method and application, and relates to the technical field of catalytic polymerization, the preparation method of the Schiff base cobalt complex comprises the following steps: mixing 5-bromo-3-tert-butyl salicylaldehyde, pyridine-4-boric acid and a first catalyst in a solvent for reaction to prepare a pyridine salicylaldehyde derivative; the method comprises the following steps: dispersing a pyridine salicylaldehyde derivative in absolute ethyl alcohol, and then adding cyclohexanediamine for reflux reaction to prepare a Salen ligand; and dissolving the Salen ligand and a second catalyst in absolute methanol, then adding a methanol solution of cobalt salt to carry out reflux reaction, then adding a methanol solution of a coordination compound, and carrying out oxidation, recrystallization, washing and drying to obtain the Schiff base cobalt complex. The preparation method of the Schiff base cobalt complex is simple, the product purity is high, and the Schiff base cobalt complex is stable to water and air; the catalyst can be used as a catalyst for preparing polycarbonate from carbon dioxide, has the advantages of small dosage, mild reaction conditions, high reaction efficiency and the like, and can catalyze chain polycarbonate synthesis with high activity and high selectivity.

The present invention relates to a metal coordination compound, in particular to a mononuclear cobalt complex based on a Salen ligand, a preparation method and an application thereof. The cobalt complex is an N,N-2-bis(2-hydroxy-5-methylphenyl)-4-fluoro-1,2-phenylenediamine cobalt complex, and its molecular formula is C 22 H 17 CoFN2O2 is prepared by dissolving 4-fluoro-1,2-phenylenediamine, 2-hydroxy-4-methylbenzene-1-formaldehyde, and a cobalt salt in a mixed solvent, adjusting the pH of the system to alkaline, reacting under heating conditions of 50°C or higher, cooling the reactants, and collecting the crystals to obtain the target product; wherein the mixed solvent is a composition consisting of DMF, methanol, and acetonitrile in a volume ratio of 1:2:1. The mononuclear cobalt complex of the present invention can be used as a catalyst in photocatalytic carbon dioxide reduction and exhibits high activity and high selectivity in photocatalytic carbon dioxide reduction.

The invention relates to the technical field of functional polymer materials, in particular to a high-stability isopropyl phenyl hydroperoxide composition for storage and transportation and a preparation method of the high-stability isopropyl phenyl hydroperoxide composition. The composition comprises a CHP matrix, an aprotic polar flame-retardant solvent, a TEMPO / BHT microcirculation antioxidant system cooperating with a fat-soluble Salen ligand, a hydrophobic modified hollow mesoporous silica microsphere preloaded with a stabilizer, and an intelligent early-warning microcapsule with a phase-change temperature-controlled release function. According to the invention, metal ion impurities are captured in situ by using a Salen ligand, and efficient capture and cyclic removal of free radicals are realized by combining TEMPO / BHT; a color developing agent and an antioxidant are released by melting the phase change material during abnormal temperature rise, and visual early warning and targeted self-repairing are provided.

There is provided a method for the selective epoxidation of farnesene using a catalyst comprising a metal M complexed with a salen ligand of formula (I).

The invention discloses a novel binuclear chiral catalyst for preparing S-epichlorohydrin with high optical purity as well as a synthesis method and an application method of the novel binuclear chiral catalyst. The molecular formula of the catalyst is [Co2L (Y) 2]. NH2O, L is a Salen tetradentate ligand formed by condensation of (R, R)-1, 2-cyclohexanediamine, 3-tert-butyl-2, 5-dihydroxybenzaldehyde and 4-oxa-1, 7-pimelic acid, and Y is a sulfonate radical or an acetate radical. The preparation method comprises the following steps: carrying out acidic hydrolysis on 2-cyanoethyl ether to obtain 4-oxa-1, 7-pimelic acid; 2-tert-butylhydroquinone is subjected to protection, formylation and deprotection, and benzaldehyde is prepared; carrying out condensation on the Salen ligand and (R, R)-1, 2-cyclohexanediamine to generate dialdehyde, and cyclizing the dialdehyde with (R, R)-1, 2-cyclohexanediamine to obtain a Salen ligand; and finally, complexing with cobalt acetate and acid under nitrogen to separate out a catalyst crystal. When the catalyst is used for epoxy chloropropane water-phase resolution and gas-phase detection, the reaction is terminated when ee is greater than or equal to 99.5%, the catalyst is directly filtered and recovered, the S-epoxy chloropropane is obtained through reduced pressure distillation, the ee is still greater than or equal to 99.0% after the catalyst is circulated for five times, and the recovery rate is greater than or equal to 92%.

The invention discloses a preparation method and application of a mononuclear nickel metal molecular catalyst, and belongs to the technical field of catalysis. The preparation method comprises the following steps: carrying out amidation reaction on salicylaldehyde and ethylenediamine to prepare a ligand N, N '-bis (salicylidene) ethylenediamine, namely a salen ligand; the ligand and nickel acetate tetrahydrate (Ni (OAc) 2.4 H2O) are refluxed in absolute ethyl alcohol to obtain a mononuclear nickel metal molecular catalyst, namely the Ni (salen) complex. A catalyst, carbon powder and a binder are fully dispersed in isopropanol and then uniformly dispensed on the surface of a glassy carbon electrode to prepare a working electrode. The molecular catalyst shows excellent catalytic performance and high selectivity in electro-catalysis NH3 oxidation synthesis of nitrate and nitrite, the synthesis method of the molecular catalyst is simple, and raw materials are cheap and easy to obtain.

The present application relates to the technical field of adsorbent, and discloses an adsorbent, a preparation method and application thereof.The adsorbent comprises a molecular sieve, a binder, a Salen ligand and a transition metal element, wherein, based on the total amount of the adsorbent, the content of the molecular sieve is 30-80 wt%, the content of the binder is 5-60 wt%, the content of the Salen ligand is 1-8 wt%, and the content of the transition metal element is 1-8 wt%, wherein the Salen ligand has the structure shown in the following formula (1); R1 and R2 are each independently selected from H, halogen, amino or C1-C5 alkyl.The adsorbent of the present application is applied to removal of mercaptan impurities, and has high adsorption performance, and can remove mercaptan impurities even under the condition of high water content.

The present invention discloses a Salen-titanium complex and its preparation method and application, and relates to the technical field of polymer synthesis catalysis. The present invention adopts 2,5-furandicarboxaldehyde and 2-aminophenol as reaction raw materials, obtains a Salen ligand through a condensation reaction, and then mixes the Salen ligand with a titanium source for coordination reaction to obtain a Salen-titanium complex. The Salen-titanium complex can be used as a catalyst for polycondensation reaction to prepare polyvalerolactone, polyethylene 2,5-furandicarboxylate and polyethylene terephthalate-co-1,4-cyclohexanedimethanol. The Salen ligand prepared by the present invention has a unique spatial structure and electronic effect. After forming a complex with titanium, it also has a corresponding unique structure, which helps the complex to maintain a better dispersed state in the polymerization reaction system. At the same time, it also shows good hydrolysis resistance, thereby avoiding hydrolysis failure and ensuring that the polymerization reaction is effectively carried out.

The present application relates to the field of purification, disclose a kind of adsorbent gradation method and purification method of hydrocarbon raw material for hydrocarbon raw material purification.The method includes renewable adsorbent and non-renewable adsorbent arranged in turn along the direction of flow, non-renewable adsorbent includes molecular sieve, binder, Salen ligand and transition metal element, based on the total amount of non-renewable adsorbent, the content of molecular sieve is 30-80wt%, the content of binder is 5-60wt%, the content of Salen ligand is 1-8wt%, the content of transition metal element is 1-8wt%, wherein, the Salen ligand has the structure as described in the following formula (1);R1 And R2 Each is independently selected from H, halogen, amino or C1-C5 Alkyl.The gradation method provided by the application can remove mercaptan and sulfide impurities in raw material simultaneously by using two kinds of adsorbents in combination,

The invention provides a binuclear iron catalyst as well as a preparation method and application thereof, and belongs to the technical field of organic synthesis. And complexing the Salen ligand and anhydrous ferric trichloride to form the binuclear iron complex Fe-1 supported by the Salen ligand. In a chloralkane solvent, a binuclear iron complex Fe-1 is used as a catalyst, and a chiral ligand, triethyl substituted silane and alpha-phenyl-alpha-diazobenzyl acetate are added to react in an oil bath, so that the chiral organosilicon compound can be obtained at the yield of 72% and the enantioselectivity that ee is equal to 97%. The binuclear iron catalyst Fe-1 has good catalytic performance on enantioselective carbene insertion reaction of Si-H bonds, the steps are simple and convenient, the reaction conditions are mild, the product is low in price and easy to obtain, the product yield is high, the stereoselectivity is high, the environmental and biological compatibility is good, and the binuclear iron catalyst Fe-1 is green and environmentally friendly and has good popularization value.

The present invention discloses a preparation method of a Cr(III)-Salen-MOF heterogeneous catalyst. This method uses 1,2-cyclohexanediamine and 5-carboxyl salicylaldehyde as raw materials, and reacts them at 70-80 °C in the presence of a solvent to synthesize a Salen complex; the Salen complex and anhydrous chromium dichloride are first reacted at room temperature in an N2 atmosphere in the presence of a solvent, and then reacted again in an air atmosphere to obtain a Cr(III)-Salen ligand. In the presence of a solvent, the Cr(III)-Salen ligand reacts with cadmium dichloride to obtain a Cr(III)-Salen-MOF catalyst; the catalyst is applied to catalyze the copolymerization reaction of SO2 and epoxides, and the yield of the product polysulfite reaches 97.8%, and the selectivity reaches 98.7%; the method of the present invention is simple, easy to operate, has mild reaction conditions and low energy consumption, and provides a new method and idea for developing environmentally friendly and highly efficient catalysts.

The invention relates to the technical field of organic synthesis, and particularly discloses a chiral tetradentate nitrogen-oxygen salen ligand, the structure of the ligand is shown in the following formula: in the formula, R is selected from phenyl or-(CH2) 4-, and Ad is 1-adamantyl. Compared with the existing tert-butyl substituted salen ligand, the novel chiral tetradentate nitrogen oxygen salen ligand obtained by the invention has larger steric hindrance, and can obtain more excellent enantiomer selectivity in asymmetric catalysis; the adamantyl salen Ti complex can be used for synthesizing a novel adamantyl salen Ti complex, and the variety of salen ligands and salen metal complexes is enriched.

The application belongs to the field of organic synthesis and particularly relates to a synthesis method of 2-chloro-3-hydrazinylpyridine, which comprises the following steps: pyridine and N-chlorosuccinimide are subjected to chlorination in the presence of FeCl3 and 1,10-phenanthroline to generate 2,3-dichloropyridine; 2,3-dichloropyridine and hydrazine hydrate are subjected to reaction in the presence of a Pd catalyst, a Salen ligand and an alkali to generate 2-chloro-3-hydrazinylpyridine; the application has mild reaction conditions, low cost, good safety and a good industrial production application prospect.

The application belongs to the technical field of supported catalysts, and discloses a supported Salen ligand coordinated metal Rh catalyst, a preparation method and application thereof.The supported Salen ligand coordinated metal Rh catalyst is formed by supporting a homogeneous Salen ligand coordinated metal Rh catalyst on a suitable porous carrier, and can realize efficient hydroformylation of long-chain alkenes, and exhibits high alkene conversion rate and selectivity of corresponding aldehydes.

The invention relates to the technical field of catalyst preparation, and discloses a functional modified cellulose supported SalenTiIV catalyst and a preparation method and application thereof.The preparation method comprises the steps that (R, R)-cyclohexanediamine, diethyl ether hydrochloride, a first organic solvent, 3, 5-di-tert-butyl salicylaldehyde and MeOH-EtOH react to obtain a reaction material; stirring the reaction material, 3-tert-butyl-5-chloromethyl salicylaldehyde, triethylamine and a second organic solvent to obtain a chiral Salen ligand; the preparation method comprises the following steps: reacting titanium tetraisopropoxide with dichloromethane and a chiral Salen ligand to obtain a chloromethyl chiral SalenTiIV catalyst; the preparation method comprises the following steps: condensing and refluxing nanocrystalline cellulose, an alcohol solution and a silane coupling agent to obtain functional modified cellulose; and condensing and refluxing a chloromethyl chiral SalenTiIV catalyst, the functionalized modified cellulose, sodium hydroxide and a third organic solvent to obtain the functionalized modified cellulose loaded SalenTiIV catalyst. The functionalized modified cellulose loaded SalenTiIV catalyst has high catalytic performance when being applied to the asymmetric oxidation reaction of thioether, and has the characteristic of excellent reusability.