42 results about "Salen ligand" patented technology

Chiral ruthenium catalysts comprising salen and alkenyl ligands are provided for stereoselective cyclopropanation, and methods of cyclopropanation are provided. The chiral ruthenium catalyst is prepared in situ by combining an alkenyl ligand, a deprotonated chiral salen ligand, and a ruthenium (II) metal. A preferred catalyst is prepared in situ by combining 2,3-dihydro-4-venylbenzofuran, deprotonated 1,2-cyclohexanediamino-N,N′-bis(3,5-di-t-butyl-salicylidene) and RuCl₂(p-cymene)]₂.

The invention discloses a catalyst for catalyzing thioether oxidation as well as a preparation method and application of the catalyst. The preparation method comprises the following steps: synthesizing a bromated Salen ligand from bromosalicylaldehyde and ethanediamine by virtue of Schiff base condensation at first; and then adding a divalent metal salt to coordinate with the Salen ligand, and introducing oxygen for oxidation after complete reaction, thereby obtaining the catalyst for catalyzing thioether oxidation. The catalyst can be used for catalyzing the thioether oxidation of methyl phenyl sulfide, ethyl phenyl sulfide, n-butyl sulfide, dibenzyl sulfide and the like with relatively high activity and relatively high selectivity; and a sulfoxide product is generated when an axial ligand is added, and a sulfone product is generated when the axial ligand is not added.

The invention discloses a Mn(III)-Salen catalyst as well as a preparation method and application thereof. The method comprises the following steps: performing reaction on 5-bromo-3-tert-butyl salicylaldehyde and pyridine-4-boric acid as raw materials to generate pyridine salicylaldehyde derivatives; reacting the pyridine salicylaldehyde derivatives with ethylene diamine to synthesize a Salen ligand with a pyridine functional group; finally coordinating divalent manganese salt with the Salen ligand, oxidizing, evaporating an obtained reaction solution to dryness, washing by water and filtering to obtain the Mn(III)-Salen catalyst. According to the method, a reaction system is simple, a reagent is easily available and low in cost, a reaction product post-treatment process is simple, the product purity is high, and the obtained Mn(III)-Salen catalyst is stable to water and air and capable of catalyzing styrene, 4-tert-butyl styrene, indene, alpha-methyl styrene and the like in a manner of relatively high activity and selectivity to synthesize olefin epoxides.

The present invention relates to a Salen metal catalyst and a preparation method thereof. The Salen metal catalyst is characterized in that substituted salicylaldehyde is reacted with organic base to prepare for and obtain chloride; corresponding organic salt is obtained after ion exchange; the organic salt is reacted with diamine to obtain Salen ligand; then the Salen ligand is reacted with metal slat to obtain the Salen metal catalyst. The prepared Salen metal catalyst has the characteristics of easy operation, being stable in water and air and being dissolved in polar solvent, such as water and ethanol, and the like, easily.

The invention discloses mononuclear aluminum and binuclear aluminum compounds based on biphenyl skeleton Salen ligand, a preparation method of the mononuclear aluminum and binuclear aluminum compounds, and an application of the mononuclear aluminum and binuclear aluminum compounds in ring-opening polymerization of catalytic internal ester. The preparation method of the mononuclear aluminum and binuclear aluminum compounds based on the biphenyl skeleton Salen ligand comprises the following steps of: adding a ligand compound to directly react with aluminum alkyl in an organic medium, filtering, concentrating and recrystallizing to obtain a target compound; and adjusting the mole ratio of the ligand compound to the aluminum alkyl, thus obtaining the mononuclear aluminum or binuclear aluminum compound respectively. The mononuclear aluminum and binuclear aluminum compounds based on the biphenyl skeleton Salen ligand are efficient catalysts for ring-opening polymerization of internal ester, and can be used for polymerization of lactide, epsilon-caprolactone and the like; and the source of raw materials is wide, the synthesis is easy, the product yield is high, the performance is stable, the catalytic activity is high, a polymer with high molecular weight can be obtained, and the requirements of industrial departments can be met. The structural formulae of the compounds are as shown in the specification.

The invention provides a method for preparing 2-bromofluorenone by catalyzing oxidizing of molecular oxygen in a water phase. The method is characterized in that a transition metal Salen ligand is used as a catalyst; under the condition of air bubbles, 2-bromofluorene is oxidized to generate the 2-bromofluorenone in the water phase, the reaction temperature is 60 to 100 DEG C, and the reaction time is 8 to 24h. The method has the advantages that the reaction is performed in the water phase, the organic solvent as the reaction medium is not needed, and the environment-friendly effect is betterin comparison with the traditional oxidizing method; the transition metal Salen catalyst has higher catalytic activity in the water phase medium; the water phase medium can be utilized for multiple times, the amount of wastes is fewer, and the industrial application prospect is stronger.

The invention provides Ru (II)-Salen metal complexes and preparation methods thereof, and relates to metal complexes and preparation methods thereof. According to the three Ru (II)-Salen metal complexes, Ru(DMSO)4Cl2 is taken as the metal precursor, and Salen ligands are H2L<1>, H2L<2> and H2L<3> obtained through condensation reactions of ethanediamine with salicylaldehyde, 5-bromosalicylaldehyde and hydroxyacetophenone respectively. The three Ru (II)-Salen metal complexes Ru(DMSO)2(H2L<1>), Ru(DMSO)2(H2L<2>) and Ru(DMSO)2(H2L<3>) are prepared with a step-by-step synthesis technique by changing conditions of each reaction process. The three novel complexes have clear structures as well as stability on water and air; the reaction conditions are mild and the post-processing is simple in catalysis of oxidizing reaction of alcohol, and the three Ru (II)-Salen metal complexes have good catalytic activity and selectivity.

The invention relates to a preparation method of a catalyst, in particular to a preparation method of a chiral Salen-Co(III) catalyst loaded by utilizing Merrifield resin. The preparation method comprises the following steps: utilizing Friedel-Crafts alkylation reaction, and taking the Merrifield resin and a salicylic aldehyde solution as raw materials to obtain Merrifield resin-based salicylic aldehyde; then enabling reaction with (1R, 2R)-(-)1,2-cyclohexanediamine and 3-5-di-tert-butyl salicylaldehyde to prepare a Merrifield resin-loaded chiral Salen ligand; through complexing with Co(OAc)2*4H2O, oxidizing to obtain the Merrifield resin-loaded chiral Salen-Co(III) catalyst; the catalyst is applied to the hydrolytic resolution of chiral epichlorohydrin. The preparation method provided by the invention is environment-friendly, free from pollution and obvious in economic benefits and easy to industrialize and has an important significance in the production development of hydrolytic kinetic resolution of a terminal epoxy compound as well as the technical progress.

The present invention provides a synthesis method for preparing chiral or achiral binuclear Salen ligand by utilizing chiral or achiral diamine and derivative of monosalicylal and disalicylal. Said method adopts the following steps: firstly, making derivative of disalicylal be reacted with excess diamine, then adding excess derivative of monosalicylal to produce synthesis reaction to prepare the invented product. The described diamine can be chiral or achiral diamine and its ammonium salt.

The present invention relates to chiral salen catalysts and a process for preparing chiral compounds from racemic epoxides by using them. More particularly, the present invention is to provide chiral salen catalysts and its use for producing chiral compounds such as chiral epoxides and chiral 1,2-diols economically in high yield and high optical purity by performing stereoselective hydrolysis of racemic epoxides, wherein the chiral salen catalyst comprises a cationic cobalt as a center metal of chiral salen ligand and counterions having weak nucleophilic property to resolve disadvantages associated with conventional chiral salen catalysts, and can be used continuously without any activating process of used catalysts because it does not loose a catalytic activity during the reaction process.

The invention relates to organic metal coordination compounds as well as synthesis methods and applications thereof, in particular to a series of poly-Salen ligands and metal coordination compounds with zinc (II) and platinum (II) in different doping proportions as well as synthesis methods and applications thereof in the field of organic luminance. The metal coordination compounds with zinc (II)and platinum (II) in different doping proportions based on the poly-Salen ligands are characterized in that the structures of the metal coordination compounds are shown in the below structural formula, wherein the synthesis methods of the poly-Salen ligands and the metal coordination compounds have the advantages of simplicity, convenience, simple technological operation, high yield, low cost andeasiness for molecular design.

The invention discloses a preparation method and application of a catalyst. The preparation method of the catalyst is characterized by comprising the following steps that (1) in a polar aprotic solvent solution, in the presence of alkali, salicylaldehyde and allyl haloalkane are made to perform a nucleophilic substitution reaction, so that a nucleophilic substitution product is obtained; secondly, the product generated in the step (1) is heated to perform a Claisen rearrangement reaction; (3) the product obtained in the step (2) and ethylenediamine are condensed in an organic solvent, so that a Salen ligand is obtained; (4), in an ether solvent, the Salen ligand and divinyl benzene are copolymerized in the presence of a radical initiator and an auxiliary initiator, so that a Salen organic polymer of a mesoporous structure is obtained; and (5) in a mixed solvent of alcohol and water, the Salen organic polymer is used as a carrier, and mesoporous Salen organic polymer Co catalyst is obtained through preparation. The catalyst prepared through the preparation method is applied to catalytic oxidation of benzoin and has good catalytic activity, and meanwhile, even the catalyst is repeatedly used, the catalytic activity of the catalyst cannot be lowered.

Disclosed is a process for the enantioselective production of an optically active amino compound by the amination of the C-H bond of an organic compound. The amino compound is produced by converting the C-H bond at the allyl position of an alkene or the C-H bond at the benzyl position of an alkylarene to the corresponding C-N bond, using a salen-manganese complex as the catalyst and N-substituted iminoaryliodinane as the amination agent. Both the catalytic activity and the enantioselectivity are very high when there is used a catalyst in which the 3- and 5-positions of the salicylaldehyde moiety of the salen ligand are substituted with an electron-withdrawing group, particularly with a halogen atom.

The invention discloses a novel coordinated circular polarization luminescent crystalline compound [ZnSalen] [DABCO] [EtOH], the molecular formula of the compound is C44H70N4O3Zn, Salen is 3, 5-di-tert-butyl salicylaldehyde-S, S-1, 2-cyclohexyl imine, DABCO is triethylene diamine, a central metal zinc atom of the compound is of a five-coordinated pyramid type configuration, N2O2 of a Salen ligand occupies four corners of the bottom surface, and another N atom of DABCO occupies the vertex. The complex presents a T-shaped conformation, and the other N atom of DABCO and an ethanol guest molecule form hydrogen-bond interaction. The complex has polarity, adopts a P21 space group, emits cyan light under 365nm ultraviolet irradiation, and can emit light in a light-induced circular polarization manner. The invention also discloses a preparation method of the metal organic compound crystal. The prepared [ZnSalen] [DABCO] [EtOH] metal fluorescent crystalline state complex has good potential application in the aspects of optical materials (such as nonlinear optical materials, circular polarization luminescence, fluorescence sensing and the like).

The invention discloses preparation and application of a cage-shaped supramolecular catalyst for catalyzing thioether oxidation. The preparation method comprises the following steps: firstly, carrying out amine-aldehyde condensation on a tridentate aldehyde compound and 1, 2-cyclohexanediamine to obtain a covalent cage compound material containing a Salen ligand, then carrying out in-situ synthesis on the ligand and transition metal M (II) to obtain a target cage supramolecular catalyst material, and finally, applying the target cage supramolecular catalyst material to selective oxidation of thioether to generate sulfone or sulfoxide compounds. The catalyst material obtained by the method shows excellent performance in the catalytic thioether oxidation reaction, the conversion rate is up to 95% or above, the catalytic reaction condition involved in the technology is mild, the reaction solvent is greener, and the catalyst has the advantages of high conversion rate, high selectivity and the like, can be recycled for multiple times, the activity and the selectivity of the catalyst are not obviously reduced, and the catalyst has high economic benefits and industrial production application values.

The invention discloses a preparation method of a tasimelteon key intermediate. According to the method, 4-vinyl-2, 3-dihydrobenzofuran is used as an initial raw material, (1R, 2R)-2-(2, 3-dihydrobenzofuran-4-yl) cyclopropane-1-ethyl formate is generated through a one-step catalytic reaction, and then (1R, 2R)-2-(2, 3-dihydro-4-benzofuranyl) cyclopropanecarboxylic acid is obtained through hydrolysis and resolution. The key step of asymmetric catalysis of chiral cyclopropane is developed, an adopted salen ligand Ru catalyst can catalyze chiral cyclopropane in one step, the process is simplified, and meanwhile the catalyst is non-toxic, environmentally friendly and high in utilization rate; then hydrolyzing into acid is realized, and chiral resolution is carried out; not only is the opticalpurity improved, but also a reagent for resolution can be recycled. The method is simple in overall process, high in operability, safe and controllable in production process, environment-friendly, energy-saving, low in cost, high in yield and suitable for large-scale production.