10 results about "Salen ligand" patented technology

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 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 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 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 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.