91results about "Ether preparation by isomerisation" patented technology

A method of converting (Z)-1-(3,5-disubstituted phenyl)-2-(4-substituted phenyl)ethene of general formula (II) to (E)-1-(3,5-disubstituted phenyl)-2-(4-substituted phenyl)ethene of general formula (I) wherein R1, R2 and R3 are same or different and independently represent (C1-C4)alkyl, (C1-C4)alkoxy(C1-C4)alkyl, (C1-C4)alkoxy(C1-C4)alkoxy(C1-C4)alkyl, allyl, vinyl, silyl, formyl, acyl, aryl(C1-C4)alkyl or substituted aryl(C1-C4)alkyl group. The present invention also provides a process for the conversion of (E)-1-(3,5-disubstituted phenyl)-2-(4-substituted phenyl)ethene of general formula (I) prepared by a process described above to E-resveratrol of the formula (III).

Porous microcomposites comprising a perfluorinated ion-exchange polymer (PFIEP) containing pendant metal cation exchanged sulfonate groups, metal cation exchanged carboxylate groups, or metal cation exchanged sulfonate and carboxylate groups, wherein the metal cation may be ligand coordinated, and optionally pendant sulfonic acid groups, carboxylic acid groups, or sulfonic acid and carboxylic acid groups, the PFIEP being entrapped within and highly dispersed throughout a network of metal oxide, a network of silica or a network of metal oxide and silica can be prepared from PFIEP and one or more precursors selected from the group consisting of a metal oxide precursor, a silica precursor, and a metal oxide and silica precursor using an in situ process. Preferred metal cations are Cr, Sn, Al, Fe, Os, Co, Zn, Hg, Li, Na, Cu, Pd or Ru. Such microcomposites have a first set of pores having a pore size diameter ranging from about 0.5 nm to about 75 nm and may further comprise a second set of pores having a diameter ranging from about 75 nm to about 1000 nm. These microcomposites possess high surface area and exhibit high catalytic activity. The catalyst is used to isomerize 1,4-dichloro-2-butene to 3,4-dichloro-1-butene, a precursor to neoprone.

An acetal compound of formula (1) is provided wherein R¹ is H, methyl or trifluoromethyl, R² is a monovalent C₁-C₁₀ hydrocarbon group, R³ and R⁴ are H or a monovalent C₁-C₁₀ hydrocarbon group, R² and R³ may together form an aliphatic hydrocarbon ring, and X¹ is a single bond or a divalent C₁-C₄ hydrocarbon group. A polymer comprising recurring units derived from the acetal compound is used as a base resin to formulate a resist composition which exhibits a high resolution when processed by micropatterning technology, especially ArF lithography.

The invention discloses a preparation method of anisic aldehyde and aims to provide a novel preparation method of anisic aldehyde in order to reduce the production cost of the anisic aldehyde and the environment pollution. The method comprises the following steps: isomerizing; carrying out refrigerated centrifugation; oxidizing; centrifuging; washing; and neutralizing. Estragole is subjected to steps such as isomerization, centrifugation and oxidization in the presence of a catalyst so that electrons in estragole molecules are rearranged, and foreign matters generate required anethole. The anethole is subjected to oxidization reaction under an acidic condition of manganese dioxide and transformed from ketone to aldehyde so that anisic aldehyde is obtained finally. According to the invention, the estragole is used as the raw material, the purification content of the estragole for preparing the anisic aldehyde can be up to over 97% and is about 13% higher than that of the traditional process. The preparation method is capable of remarkably increasing the yield of the anisic aldehyde and meeting the requirement for large-scale industrial production, easier to purify as well as little in equipment corrosion and environment pollution.

The invention discloses a preparation method for synthesizing vanillin by using natural eugenol as raw material. The preparation method comprises the following steps: adding potassium hydroxide and n-amyl alcohol into a three-neck round bottom flask with volume of 250 ml and equipped with a backflow condensation tube, a magnetic stirring device and a constant-pressure dropping funnel through isomerization, dropwise adding the natural eugenol after stirring for dissolution, heating for backflow, then transferring a reaction solution into water for dilution, transferring lower-layer liquid to a separatory funnel in several times, and washing with a NaOH solution until the color of upper-layer liquid does not become light; combining all alkali liquors, and extracting with acetone, acidating and evaporating rotatably to obtain isoeugenol; adding a certain amount of nitrobenzene into the isoeugeno to oxidize double bond of propenyl of the isoeugeno, and then purifying a vanillin crude product, wherein the vanillin productivity can reach above 95.0%. The method has the advantages that the adoption of highly-toxic catalysts of carbonyl iron and the like in the isomerization process is avoided, the after-treatment technology is relatively simple, and the operation is convenient. An extraction agent can be recycled to lower the cost.

The invention relates to a method for synthesizing anethole by taking estragole oil as a raw material. The estragole oil is subjected to isomerization reaction in the presence of a basic catalyst, and is frozen, crystallized and separated, so as to obtain trans-anethole. The method is cheap in raw material and is simple and safe; meanwhile, the reuse value of a by-product is achieved, and the purity of the obtained anethole can be up to over 96% by optimization on rectification and extraction conditions, so that the method is applicable to industrial production.

The invention provides a preparation method of 1,2,3-trimethoxy-5-allylbenzene. The synthetic route of the preparation method is as shown in the specification. According to the preparation method disclosed by the invention, the synthetic process conditions are simple, the cost is low, the total yield of the reaction can be above 49% and the preparation method is suitable for industrialized mass production and has significant business values.

The invention belongs to the technical field of metal catalytic synthesis, and discloses a method for isomerizing and converting (Z)-olefins into (E)-olefins. The (E)-olefins are prepared through a reaction at -30-80 DEG C for 0.5-48 h by using a combination of CoX2 and a PNP or PAO ligand as a catalyst in the presence of an activating reagent; and a molar ratio of the (Z)-olefins to the CoX2 to the PNP or PAO ligand to the activating reagent is 1:(0.00001-0.10):(0.00001-0.10):(0.00003-0.30). The catalyst used in the invention is the combination of the cheap metal cobalt salt and the simple and easily available ligand, no other toxic transition metal (such as ruthenium, rhodium and palladium) salt is added in the reaction, and the method also has the advantages of cheap and easily available raw material, good functional group tolerance, mild reaction conditions, simplicity in operation, and e atom economy of 100%.

A solid-supported catalyst ligand which chelates palladium (II) species to form a complex that functions as a heterogeneous catalyst that is stable and can be recycled without significantly losing any catalytic activity in a variety of chemical transformations, a method for producing the solid-supported catalyst ligand and a method for catalyzing a palladium cross-coupling reaction, such as the Suzuki-Miyaura, Mizoroki-Heck, and Sonagashira reactions.

The invention relates to a preparation method of trienes liquid crystal monomers. The method comprises the following steps: using alkyl 2,3-difluorobenzene, alkoxy 2,3-difluorobenzene, 1-bromine-4-alkyl 2,3-difluorobenzene or 1-bromine-4-alkoxy 2, 3-difluorobenzene as raw materials, performing a metallization reaction or a Grignard reaction and a reaction with a cyclohexanone compound, performing hydroxyl protection, a Wittig reaction, alkene-ether hydrolysis, hydroxyl deprotection and alcohol dehydration so as to obtain an intermediate of which the formula is shown in the specification, performing the Wittig reaction once again, and performing a double-bond isomerization reaction so as to obtain the finished product, wherein three steps of the reactions of the alkene-ether hydrolysis, the hydroxyl deprotection and the alcohol dehydration can be combined to be performed in one step. The preparation method disclosed by the invention overcomes the disadvantage that the yield of cyclohexenone in the Wittig reaction is extremely low in the conventional preparation method of the compound, the yield of products is increased, the production cost is reduced, the large-scale production is facilitated, and the preparation method has very good application prospects.

The invention provides a method for preparing halogenated benzo [alfa] fluorenol. The method comprises the following step of performing series electrophilic cyclization reaction on 3-aryl-1-(2-(2-aryl ethinyl) phenyl) propargyl-2-alcohol serving as a reaction substrate and various electrophilic reagents such as halogenated succinimide (NXS, X=I, Br and Cl) or simple substance iodine (I2), simple substance bromine (Br2) or iodine chloride (ICl) at the temperature of 0 and 15 DEG C for 10 and 15 hours under the catalysis of AgOTf, and is a 'one-pot method' for efficiently preparing the Halogenated benzo [alfa] fluorenol. The method has the advantages of mild reaction conditions, low cost, less side reaction, high product purity, is easy to operate and can be applied to mass production of the halogenated benzo [alfa] fluorenol; and moreover, separation and purification can be conveniently realized.

The invention relates to a method for converting estragole into trans-anethole. The method comprises the steps of carrying out isomerism reaction on the estragole and NaOH solution under pressurization so as to produce the trans-anethole, then carrying out acid pickling and neutralizing on the trans-anethole, washing, carrying out freeze crystalizing, centrifuging to separate, and vacuum rectifying to obtain the high purity trans-anethole with the purity of greater than 99.5%. The method has short reaction time, uses little alkaline, avoids contacting with the air, reduces side reactions like oxidative polymerization, improves the yield of the trans-anethole.

The invention belongs to the field of organic synthesis, and particularly relates to an isoeugenol synthetizing method, which comprises the following steps: a, adding eugenol and potassium hydroxide as per certain proportion into a three-necked bottle, and adding a glycols solvent to serve as a reaction solvent; b, under protection of nitrogen, heating to 160-170 DEG C and performing enclosed reaction between the reactants for 6-8 hours; c, after reaction, adding acid untill the pH value indicates acidic; d, adding methylbenzene, stirring, filtering, and washing the solid with small amount of methylbenzene; e, separating out organic phases from the filtrate in the step d, extracting the aqueous phase of the filtrate with methylbenzene, and combining the organic phases; f, washing the organic phases with water until the pH value indicates neutral, removing the solvent by means of a rotary evaporator, and performing reduced pressure distillation, so as to obtain a product. The isoeugenol synthetizing method can acquire trans-isoeugenol with content of more than 90% through further reaction, and is more suitable for industrialized produciton.

The invention provides a method for manufacturing olefinic derivative composition. The invention provides a method for manufacturing a compound. The compound is useful, has an E-alkene structure and serves as an intermediate or a prototype for the manufacturing of chemical synthetics such as medicine, pesticides, liquid crystals. Through arylsulfinate acting on a composition containing E-alkene derivative and Z-alkene derivative while heating is performed, the alkene derivative composition having more than 80 % of the E-alkene derivative is manufactured. The composition thus obtained has a higher ratio of the E-alkene derivative with respect to the Z-alkene derivative (E body/Z body), so that an object E-alkene derivative can be obtained in a higher ratio than that of traditional methods.

The invention relates to a method for preparing an olefin composition of E-construction, comprising isomerization steps for transforming an olefin composition of Z-construction into the olefin composition of E-construction under the isomerization situation, wherein the olefin composition of E-construction is in solid phase.

The invention provides a synthesis method of isoeugenol. The method comprises the following steps: adding ground cloves powder to a potassium hydroxide solution which is 1mol/L in concentration and ethanol, and keeping under an ultrasonic condition at 100-130 DEG C for 1-2 hours to obtain a decomposition solution; stirring and mixing the decomposition solution with methylbenzene, heating and distilling under a vacuum state, controlling distilling and heating temperature at 50-90 DEG C, controlling temperature of a distillation gas volatilization outlet at 35-45 DEG C, and condensing and collecting distillation gas through a condenser to obtain low boiling point impurities; continuing to distill rest filtrate after removing the low boiling point impurities, controlling distilling and heating temperature at 100-120 DEG C, controlling temperature of the distillation gas volatilization outlet at 90-105 DEG C, and condensing and collecting the distillation gas through the condenser to obtain the isoeugenol. The synthesis method disclosed by the invention is light in environmental pollution, more simple to operate and quite low in production cost; moreover, content of trans-isoeugenol can achieve more than 95% in the isoeugenol.

The invention discloses a conversion method of 1-cyclohexyl-2,3-difluorobenzene derivative cis-trans-isomers. The method comprises the following steps: in a hydrogen atmosphere, evenly mixing 1-cyclohexyl-2,3-difluorobenzene derivative cis-trans-isomers disclosed as Formula I and a catalyst to perform catalytic reaction, and after the reaction finishes, obtaining the 1-cyclohexyl-2,3-difluorobenzene derivative trans-isomers disclosed as Formula I. The method can convert most cis-structure products into a trans-structure liquid crystal material, avoids the direct discharge of the cis-structure products as waste compounds, reduces the pollution, and greatly increases the yield of the trans-structure liquid crystal material, thereby lowering the production cost of the 1-cyclohexyl-2,3-difluorobenzene derivative liquid crystal monomer. Formula I.

The invention discloses a ruthenium olefin metathesis catalyst with an adjacent space steric structure as well as a preparation method and application thereof. The catalyst has the following general formula and the preparation method comprises the following steps: (1) Zn (OAc) 2.2H2O and a compound (I) are dissolved in an isopropanol solvent, ethylenediamine is added for reaction, and precipitatedsolids are filtered after the reaction and washed with methanol and chloroform, thereby obtaining a compound (II) after vacuum drying; and (2) Grubbs-Hoveyda II and the compound (II) are added into adried tetrahydrofuran solvent under nitrogen condition for reaction, the solvent is centrifuged under N2 after the reaction and then collected and dried until only solids are left, and the solids arewashed by anhydrous ether, thereby obtaining the compound (III), namely the ruthenium olefin metathesis catalyst provided by the invention. The method provided by the invention is simple in steps andmild in reaction condition, and the cis-structural product with specific configuration can be obtained by reaction under room temperature, therefore the invention has a broad application prospect.

Belonging to the technical field of metal catalytic synthesis, the invention discloses a method for stereoselective synthesis of (E)-trisubstituted olefin. The method includes: taking 1, 1-disubstituted olefin as the raw material, and adopting a combination of CoX2 and PAO ligand as the catalyst; and in the presence of an activating reagent, carrying out reaction for 0.5min-48h at a temperature ranging from -30DEG C to 80DEG C to prepare (E)-trisubstituted olefin. Compared with the prior art, the method has the advantages of more economical, efficient and environment-friendly catalyst, good tolerance of the reaction functional group, mild reaction conditions, simple operation, no need for participation of additional reagents, and atom economy of 100%. In addition, the reaction has no needof any other toxic transition metal (like ruthenium, rhodium, palladium, etc.) salt, therefore the method has great practical application value in pharmaceutical and food chemical industry.

The process of preparing green fuel dimethyl ether with coarse ethanol product in an electrically catalyzed hydrated protonic reactor includes re-arranging ethanol molecule under the actions of electrode and double function metal-acid catalyst to obtain dimethyl ether product, and collecting dimethyl ether. The present invention uses material from biomass and has no fossil resource.

The invention relates to a resveratrol preparation method which belongs to the field of food additives and preparing methods thereof. The resveratrol synthesis preparation method comprises the following steps: (1) using 4-methoxybenzyl bromide, triphenyl phosphine and xylene as raw materials for synthesis of triphenyl 4-methoxybenzyl phosphorus bromide (compound I); (2) using the compound I, tetrahydrofuran and 3, 5-dimethoxy benzaldehyde as raw materials for synthesis of a cis / trans-3, 4, 5-trimethoxy-1, 2-diphenylethene mixture (compounds II); (3) using the compound II, tetrahydrofuran and diphenyl disulfide as raw materials for synthesis of trans-3, 4, 5-trimethoxy-1, 2-diphenylethene (compound III); and (4) using the compound III, boron tribromide and methylene chloride as raw materials for synthesis of trans-3, 4, 5-trihydroxy-1, 2-diphenylethene (compound IV), namely resveratrol. The resveratrol synthesis preparation method has the advantages of mild reaction conditions, high yield (on the basis of the 4-methoxybenzyl bromide, the total yield is 66%), high purity (more than 98%) and the like.