WO2008099966A1 - 4-メチル-2,3,5,6-テトラフルオロベンジルアルコールの製造方法 - Google Patents
4-メチル-2,3,5,6-テトラフルオロベンジルアルコールの製造方法 Download PDFInfo
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- WO2008099966A1 WO2008099966A1 PCT/JP2008/052914 JP2008052914W WO2008099966A1 WO 2008099966 A1 WO2008099966 A1 WO 2008099966A1 JP 2008052914 W JP2008052914 W JP 2008052914W WO 2008099966 A1 WO2008099966 A1 WO 2008099966A1
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
- C07C29/62—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by introduction of halogen; by substitution of halogen atoms by other halogen atoms
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
- C07C29/132—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of an oxygen containing functional group
- C07C29/136—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of an oxygen containing functional group of >C=O containing groups, e.g. —COOH
- C07C29/147—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of an oxygen containing functional group of >C=O containing groups, e.g. —COOH of carboxylic acids or derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
- C07C29/58—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by elimination of halogen, e.g. by hydrogenolysis, splitting-off
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/347—Preparation of carboxylic acids or their salts, halides or anhydrides by reactions not involving formation of carboxyl groups
- C07C51/363—Preparation of carboxylic acids or their salts, halides or anhydrides by reactions not involving formation of carboxyl groups by introduction of halogen; by substitution of halogen atoms by other halogen atoms
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/14—Preparation of carboxylic acid esters from carboxylic acid halides
Definitions
- the present invention relates to a process for producing 4-methyl-2,3,5,6-tetrafluoro oral benzyl alcohol.
- US Patent Publication No. 2005 0054886 describes that 4-methyl-2,3,5,6-tetrafluoro oral bendyl alcohol is useful as an intermediate for the synthesis of insecticides.
- a method there is described a method comprising five steps of fluorination, hydrogenation, diazotization, halogenation and hydrogenation using 2,3,5,6-tetrachloroterephthalonitrile as a starting material.
- the present invention is a.
- Process (A) Process of fluorinating 2, 3, 5, 6-tetrachloroterephthalic acid dichloride
- step (A) fluorination is performed using an alkali metal fluoride
- ⁇ 4> a mixture in which potassium fluoride contains 5 to 50 parts by weight of methanol with respect to 1 part by weight of potassium fluoride and potassium fluoride; and an aprotic organic solvent having a high boiling point for methanol
- the composition is a potassium fluoride composition obtained by distilling off methanol from the resulting mixture
- step (A) the fluorination is carried out in the presence of dimethylsulfone
- ⁇ 6> The production method according to any one of ⁇ 1> to ⁇ 5>, wherein the product obtained in step (A) is tetrafluoroterephureuric acid difluoride;
- step (A) further comprises an operation of mixing water with a reaction mixture obtained by fluorination
- step (A) is 2, 3, 5, 6-tetrafluoroterephthalic acid
- step (A) further includes an operation of mixing a reaction mixture obtained by fluorination with an alcohol compound having 1 to 6 carbon atoms.
- step (A) further includes an operation of mixing a reaction mixture obtained by fluorination with an alcohol compound having 1 to 6 carbon atoms.
- step (B) reduction is performed using at least one reducing agent selected from the group consisting of a borohydride compound, an aluminum hydride compound, and a hydride key compound ⁇ 1> to ⁇ 10 >
- a reducing agent selected from the group consisting of a borohydride compound, an aluminum hydride compound, and a hydride key compound ⁇ 1> to ⁇ 10 >
- step (B) the reduction is carried out using an alkali metal borohydride salt.
- the production method according to any one of ⁇ 1> to ⁇ 10>; ⁇ 13> The production method according to ⁇ 12>, wherein the metal borohydride metal salt is sodium borohydride;
- step (B) the reduction is carried out in the presence of at least one selected from the group consisting of an acid, water and an alcohol compound having 1 to 10 carbon atoms;
- ⁇ 15> The production method according to any one of ⁇ 1> to ⁇ 14>, wherein the product obtained in step (B) is 2, 3, 5, 6-tetrafluoro-1,4-benzenedimethanol ;
- step (C) chlorination is carried out using hydrogen chloride.
- step (C) chlorination is carried out using hydrogen chloride.
- step (C) chlorination is carried out in a two-layer system of an aqueous layer and an organic layer.
- step (C) The production according to any one of ⁇ 1> to ⁇ 17>, wherein the product obtained in step (C) is 4-chloromethyl-2,3,5,6-tetrafluorobensyl alcohol ⁇ 19>
- step (D) hydrogenation is performed using hydrogen in the presence of a metal catalyst.
- step (D) the hydrogenation is carried out in the presence of a base.
- Step (A) is a step for fluorinating 2, 3, 5, 6-tetrachloroditerephthalic acid dichloride.
- 2,3,5,6-tetrachloroterephthalic acid dichloride can be produced by a known method described in Japanese Patent Publication No. 2_1571.
- Fluorination is usually carried out by mixing 2, 3, 5, 6-tetrachloroterephthalic acid dichloride, oral lid and a fluorinating agent.
- Fluorinating agents include potassium fluoride, sodium fluoride, cesium fluoride Potassium metal fluoride, hydrogen fluoride and the like can be mentioned, alkali metal fluoride is preferable, and potassium fluoride is more preferable.
- the fluorinating agent a commercially available product may be used, or a product produced by any known method may be used.
- the alkali metal fluoride those having a small particle diameter are preferable.
- an alkali metal fluoride having a low water content is preferred.
- an alkali metal fluoride obtained by a spray drying method is preferred.
- the potassium fluoride composition obtained by the following (Method 1) is also preferable to use as a fluorinating agent.
- Method 1 A mixture containing potassium fluoride and 50 to 50 parts by weight of methanol relative to 1 part by weight of potassium fluoride (hereinafter abbreviated as potassium fluoride mixture) and more than methanol.
- a method of obtaining a potassium fluoride composition by mixing a protic organic solvent having a high boiling point and distilling off methanol from the resulting mixture.
- (Method 1) a method for preparing a potassium fluoride composition by (Method 1) will be described.
- potassium fluoride used in (Method 1) a commercially available product is usually used.
- Anhydrous potassium fluoride may be used, or potassium fluoride hydrate may be used.
- Potassium fluoride containing about 5% by weight or less of water can also be used.
- the particle size is not particularly limited, and the particle size may be relatively large (for example, crystals) or small (for example, powder).
- methanol used in (Method 1) a commercially available product is usually used. Anhydrous methanol can be used, and water containing less than about 5% by weight of water can also be used.
- the amount of methanol used is 5 to 50 parts by weight per 1 part by weight of potassium fluoride.
- Examples of the resulting fluorinated rhodium mixture include a dispersion in which potassium fluoride is dispersed in methanol, a solution in which the total amount of potassium fluoride is dissolved in methanol, and the like. A dissolved solution is preferred.
- the amount of methanol used to prepare such a solution varies depending on the preparation temperature, the amount of water in methanol, etc., but is preferably 8 parts by weight or more per 1 part by weight of potassium fluoride.
- the potassium fluoride mixture is prepared by mixing potassium fluoride and methanol. can do.
- a potassium fluoride composition can be prepared by a method of mixing potassium hydroxide and hydrogen fluoride in methanol.
- a method of mixing potassium hydroxide and hydrogen fluoride in methanol is preferable.
- potassium hydroxide a commercially available one is usually used as it is or after drying if necessary.
- the shape is not particularly limited, and any shape such as a piece, a rod, or a tablet may be used.
- an aqueous solution or an alcohol solution may be used.
- the water content is preferably small.
- As the alcohol solution a methanol solution is preferable.
- hydrogen fluoride As hydrogen fluoride, a commercially available one is usually used as it is or mixed with methanol or water. Hydrogen fluoride gas or hydrofluoric acid may be used. Hydrofluoric acid is preferable in terms of operability and availability. When hydrogen fluoride gas is used, it may be mixed with a gas inert to the reaction. When hydrofluoric acid is used, its concentration is preferably high. The amount of hydrogen fluoride to be used is generally 0.9 to 1.1 mol, preferably 0.99 to 1.0 mol, per 1 mol of potassium hydroxide.
- the mixing order of potassium hydroxide, hydrogen fluoride, and methanol is not particularly limited, but it is preferable to add hydrogen fluoride to a mixture of potassium hydroxide and methanol.
- the potassium fluoride composition is prepared under normal pressure conditions, but may be prepared under reduced pressure conditions or pressurized conditions.
- the preparation temperature is usually 0 to 100 t: preferably 20 to 70.
- the aprotic organic solvent having a boiling point higher than that of methanol may be an aprotic polar solvent or an aprotic apolar solvent, but the fluorination of the obtained potassium fluoride composition In view of activity in the reaction, an aprotic polar solvent is preferred.
- non-protonic polar solvents include C6-C8 aliphatic hydrocarbon solvents such as hexane, heptane, octane, and cyclohexane, and aromatic hydrocarbon solvents such as benzene, toluene, and xylene.
- aprotic polar solvents examples include diisopropyl ether, dibutyl ether, dioxane, diethylene glycol dimethyl ether, and triethylene glycol dimethyl.
- Ether solvents such as ether, sulfolane solvents such as sulfolane, dimethyl sulfone, and methyl ethyl sulfone, sulfoxide solvents such as dimethyl sulfoxide, jetyl sulfoxide, and tetramethylene sulfoxide, N, N-dimethylformamide, N, N-dimethylacetamide
- alkylamide solvents such as N-methylpyrrolidone, nitrile solvents such as ptyronitrile and adiponitrile, and the like.
- Sulfone solvents, sulfoxide solvents and alkylamide solvents are preferred.
- the amount of aprotic organic solvent having a boiling point higher than that of methanol is usually 1 part by weight or more per 1 part by weight of fluorinated power, and there is no particular upper limit. In general, the content is 20 parts by weight or less because of lowering the properties.
- Specific examples of the method of mixing the fluorinated rhodium mixture with an aprotic organic solvent having high boiling point and distilling off methanol from the resulting mixture include the following (i) and (ii) The method (ii) is preferable from the viewpoint of the activity of the obtained potassium fluoride composition.
- the obtained potassium fluoride composition is preferably substantially free of methanol in terms of activity.
- the solvent that forms an azeotrope with methanol include aromatic hydrocarbon solvents such as benzene, toluene, and xylene, and aliphatic hydrocarbon solvents such as hexane and cyclohexane.
- aromatic hydrocarbon solvents such as benzene, toluene, and xylene
- aliphatic hydrocarbon solvents such as hexane and cyclohexane.
- a part of the aprotic organic solvent can be distilled off together with a solvent that forms an azeotrope with methanol and methanol. Good.
- the operating pressure for distilling off methanol is usually 0.7 to 200 kPa, and the operating temperature is usually 20 to 20.
- the distilled methanol may be reused for the preparation of the potassium fluoride mixture.
- the potassium fluoride composition thus obtained is a mixture in which fine powdery potassium fluoride is dispersed in an aprotic polar organic solvent, and is substantially composed of fine powdery potassium fluoride and the above aprotic organic solvent. It consists of.
- the content of potassium fluoride is usually 5 to 70% by weight. .
- the amount of the fluorinating agent used in step (A) is usually at least 6 moles per mole of tetrachloroterephthalic acid dichloride, and there is no particular upper limit. ⁇ : 10 mol.
- the fluorination of tetrachloroterephthalate dichloride is usually carried out in the presence of a solvent.
- a solvent an aprotic polar solvent is preferable.
- the aprotic polar solvent include those similar to those used for the preparation of the potassium fluoride composition, a sulfone solvent, a sulfoxide solvent or an alkylamide solvent is more preferred, a sulfone solvent is more preferred, and dimethyl Sulfone is particularly preferred.
- the amount of the solvent used is not particularly limited, but is usually 0.1 to 20 parts by weight with respect to 1 part by weight of tetrachloroterephthalic acid dichloride.
- the reaction temperature is usually in the range of 120 to 200.
- the organic solvent inert to the reaction is preferably an organic solvent inert to the reaction whose boiling point is lower than that of dimethylsulfone and whose melting point is lower than that of dimethylsulfone. It is more preferably an organic solvent inert to the reaction having a melting point lower than that of dimethyl sulfone, a boiling point of 100 to 200, and a melting point of 50.
- organic solvents inert to the reaction which are:
- the organic solvent inert to the reaction include ether solvents such as dioxane and diethylene glycol dimethyl ether, N, N-dialkylamide solvents such as N, N-dimethylacetamide, toluene, xylene, black benzene, and benzo
- aromatic hydrocarbon solvents such as nitriles and aliphatic hydrocarbon solvents such as octane and decane.
- the amount used is usually 0.5 parts by weight or less, preferably 0.2 parts by weight or less, based on 1 part by weight of dimethyl sulfone.
- Fluorination of tetrachloroterephthalic acid dichloride is performed by mixing tetrachloroterephthalic acid dichloride and a fluorinating agent in the presence of a solvent, if necessary, and stirring at a predetermined temperature. It is not limited.
- alkali metal fluoride is used as the fluorinating agent, it is preferable to carry out fluorination after removing water contained in the alkali metal fluoride.
- alkali metal fluoride and a solvent are mixed and heated under reduced pressure, or an organic solvent that forms an azeotrope with water such as toluene or xylene. And a method of heating the mixture of an alkali metal fluoride and a solvent to perform azeotropic dehydration.
- the fluorination is usually carried out under normal pressure conditions, but may be carried out under pressurized conditions.
- the progress of the reaction can be confirmed by ordinary analytical means such as gas chromatography or liquid chromatography.
- the reaction mixture after fluorination usually contains tetrafluoroterephthalic acid difluoride as a product, and the reaction mixture containing tetrafluoroterephthalic acid difluoride is used as it is in the next step (B).
- the reaction mixture may be concentrated, and tetrafluoroterephthalic acid difluoride may be taken out and used in the step (B).
- alcohol compounds having 1 to 6 carbon atoms include linear, branched or cyclic such as methanol, ethanol, n-propanol, isopropanol, n-butanol, tert-butanol, cyclohexanol, etc. Of the alcohol compound. These are usually commercially available.
- the amount of the alcohol compound having 1 to 6 carbon atoms is not particularly limited, but it is usually 2 to 50 mol with respect to 1 mol of tetrafluoroterephthalic acid difluoride contained in the reaction mixture.
- the reaction mixture may be mixed with water or an alcohol compound having 1 to 6 carbon atoms in the presence of an organic solvent immiscible with water.
- Organic solvents that are not miscible with water include aromatic hydrocarbon solvents such as toluene, xylene, and black benzene, aliphatic hydrocarbon solvents such as pentane, hexane, and heptane, and halogenated solvents such as dichloromethane, dichloroethane, and black mouth form. Examples thereof include hydrocarbon solvents, ether solvents such as jetyl ether and methyl tert-butyl ether, and ester solvents such as ethyl acetate. The amount used is not particularly limited.
- reaction mixture When the reaction mixture is mixed with water or an alcohol compound having 1 to 6 carbon atoms, hydrogen fluoride is usually generated. Therefore, it is preferable to carry out mixing while removing hydrogen fluoride, such as mixing in the presence of a base, mixing while blowing an inert gas, or mixing under reduced pressure.
- Bases include tertiary amines such as triedylamine and diisopropylethylamine, nitrogen-containing aromatic compounds such as pyridine, collidine and quinoline, carboxylic acid alkali metal salts such as sodium acetate, sodium methylate, sodium ether Alkali metal alcoholates such as lato, alkali metal hydroxides such as sodium hydroxide and potassium hydroxide, alkaline earth metal hydroxides such as calcium hydroxide and magnesium hydroxide, alkali metals such as sodium carbonate and potassium carbonate Alkali metal hydrogen carbonates such as carbonates, sodium hydrogen carbonate, potassium hydrogen carbonate, alkaline earth metal carbonates such as calcium carbonate and magnesium carbonate, alkaline earth metal hydrogen carbonates such as calcium hydrogen carbonate, magnesium hydrogen carbonate, etc.
- tertiary amines such as triedylamine and diisopropylethylamine
- nitrogen-containing aromatic compounds such as pyridine, collidine and quinoline
- alkali metal carbonates, alkali metal hydrogen carbonates, alkaline earth metal carbonates or alkaline earth metal hydrogen carbonates are preferred, alkali metal carbonates, alkali metal hydrogen carbonates, alkaline earths More preferred are alkali metal carbonates or alkaline earth metal hydrogen carbonates.
- the amount of the base used may be an amount sufficient to neutralize the generated hydrogen fluoride, and is usually 2 to 5 mol per 1 mol of tetrafluoroterephthalic acid difluoride.
- Examples of the inert gas include nitrogen, carbon dioxide, and air.
- the pressure when mixing under reduced pressure is usually 6 to 100 kPa.
- the mixing order of the reaction mixture and water or an alcohol compound having 1 to 6 carbon atoms is not particularly limited.
- water or an alcohol compound having 1 to 6 carbon atoms is added to the mixture of the reaction mixture and base, or base and water or an alcohol compound having 1 to 6 carbon atoms is added to the reaction mixture. It is preferable to add.
- the mixing temperature is not particularly limited, and is usually 0 to 100. When carried out in the presence of a base, 0 to 30 is preferred.
- the mixture obtained after completion of the mixing contains tetrafluoroterephthalic acid or tetrafluoroterephthalic acid diester as a product, and this may be used as it is in the next step (B).
- an organic layer containing the product obtained by carrying out usual post-treatment such as liquid separation and filtration is used in the step (B).
- the product may be taken out from the organic layer by a taking-out means such as concentration and crystallization and used in the step (B).
- Tetrafluoroterephthalic acid diesters include 2,3,5,6-tetrafluoroterephthalic acid dimethyl, 2,3,5,6-tetrafluoroterephthalic acid jetyl, 2,3,5,6—tetrafluoro Di (n-propyl) terephthalate, 2, 3, 5, 6-diisopropyl tetrafluoroterephthalate, 2, 3, 5, 6-ditetrafluoroterephthalate (n-butyl), 2, 3, 5, 6-Tetrafluoroterephrate diurate (tert-butyl) and the like.
- Step (B) is a step of reducing the product obtained in step (A). Reduction of the product obtained in step (A) is usually carried out by bringing the product obtained in step (A) into contact with a reducing agent.
- borohydride compounds include alkali metal borohydrides such as sodium borohydride, lithium borohydride, and potassium borohydride, and alkaline earth metal borohydrides such as calcium borohydride and magnesium borohydride. And borane compounds such as dipolane and borane-tetrahydrofuran complex.
- the aluminum hydride compound include aluminum hydride metal salts such as lithium aluminum hydride, and dialkylaluminum hydrides such as diisobutylaluminum hydride.
- hydrogenated silicon compounds include trisilylsilyl hydride, triisopropyl silyl hydride, jetyl silyl hydride, alkylsilyl hydrides such as 1,1,2,2-tetramethyldisilane, silane such as monosilane and disilane, etc. Is mentioned.
- a borohydride compound is preferable, an alkali metal borohydride is more preferable, and sodium borohydride is further preferable.
- reducing agent a commercially available one may be used, or one prepared by a known method may be used.
- a reducing agent prepared in advance may be used, or may be prepared in a reaction system.
- the amount of the reducing agent to be used is generally 1 to 5 mol, preferably 2 to 3 mol, per 1 mol of the product obtained in step (A).
- the reduction is usually performed in a solvent.
- the solvent include ether solvents such as jetyl ether, methyl tert-butyl ether, tetrahydrofuran, dioxane and diisopropyl ether, and aromatic hydrocarbon solvents such as toluene, xylene and black benzene.
- the amount used is not particularly limited, but considering volumetric efficiency, it is practically not more than 100 parts by weight with respect to 1 part by weight of the product obtained in the step (A).
- the reduction proceeds at a high yield, so that at least one selected from the group consisting of acids, water, and alcohol compounds having 1 to 10 carbon atoms is used. It is preferred to carry out the reduction in the presence of two.
- the acid include mineral acid, carboxylic acid, sulfonic acid and the like, and mineral acid is preferable.
- the mineral acid include hydrochloric acid, sulfuric acid, phosphoric acid and the like, and hydrochloric acid and sulfuric acid are preferable.
- carboxylic acid examples include aliphatic carboxylic acids such as formic acid, acetic acid, trifluoroacetic acid, propionic acid, butanoic acid, and oxalic acid, and aromatic carboxylic acids such as benzoic acid.
- sulfonic acid examples include aliphatic sulfonic acids such as methanesulfonic acid, ethanesulfonic acid, and trifluoromethanesulfonic acid, and aromatic carboxylic acids such as benzenesulfonic acid and p-toluenesulfonic acid.
- Such acid is usually a commercially available acid. The acid may be used as it is, or may be used by mixing with water or the above solvent.
- the acid concentration is usually 5% by weight or more, and a high concentration is preferable.
- the amount of the acid used is usually 0.2 to 5 mol, preferably 0.2 to 2 mol on a proton basis, per 1 mol of the alkali metal borohydride.
- the amount of water used is usually 0.5 to 10 moles, preferably 0.9 to 4 moles per mole of alkali metal borohydride.
- Examples of the alcohol compound having 1 to 10 carbon atoms include aliphatic alcohols such as methanol, ethanol, n-propanol, isopropanol, n-butanol and tert-butanol, and aromatic alcohols such as phenol and benzyl alcohol. Aliphatic alcohol is preferred, and methanol is more preferred.
- the amount used is not particularly limited, and an excess amount may also be used as a solvent, but it is usually 0.2 to 50 mol per 1 mol of the alkali metal borohydride.
- the reduction is usually carried out by contacting the product obtained in step (A) with a reducing agent in a solvent.
- a reducing agent e.g., an alkali metal borohydride
- the mixture of the product obtained in step (A), the alkali metal borohydride and the solvent is stirred at a predetermined reaction temperature, and an acid, It is preferable to add at least one selected from the group consisting of water and an alcohol compound having 1 to 10 carbon atoms.
- the reduction temperature is usually from 0 to 1550.
- the reduction temperature is preferably 20 to 80, and the reducing agent is Use alkali metal borohydride
- the reduction temperature is preferably 40 to 80.
- the reduction is usually performed under normal pressure conditions, but may be performed under pressure conditions. The progress of the reduction can be confirmed by ordinary analysis means such as gas chromatography or liquid chromatography.
- a reaction mixture containing 2,3,5,6-tetrafluoro-1,4-monobenzenedimethanol is obtained as a product.
- the obtained reaction mixture may be used as it is in the next step (C).
- the obtained reaction mixture is mixed with an aqueous solution of mineral acid such as hydrochloric acid, sulfuric acid, phosphoric acid and nitric acid.
- mineral acid such as hydrochloric acid, sulfuric acid, phosphoric acid and nitric acid.
- neutralization, extraction, etc. are performed to obtain an organic layer containing 2,3,5,6-tetrafluoro-mouth-1,4 benzenedimethanol, and the organic layer is used in step (C).
- the organic layer may be concentrated and the product may be taken out and used in step (C).
- Step (C) is a step of chlorinating the product obtained in step (B).
- Chlorination is usually carried out by contacting the product obtained in step (B) with a chlorinating agent.
- the chlorinating agent is not particularly limited as long as it is used for chlorination of alcoholic hydroxyl groups, and examples thereof include hydrogen chloride, thionyl chloride, phosphorus trichloride, phosphorus oxychloride, and the like, with hydrogen chloride being preferred. These chlorinating agents are usually commercially available.
- hydrogen chloride any of hydrogen chloride gas, an organic solvent solution of hydrogen chloride, and hydrochloric acid can be used, and hydrochloric acid is preferable in terms of operability and availability.
- Hydrogen chloride gas may be used as a mixture with a gas inert to the reaction. When hydrochloric acid is used, one having a high concentration is preferable, and commercially available concentrated hydrochloric acid is preferable.
- the organic solvent solution of hydrogen chloride include hydrogen chloride Z dioxane solution, hydrogen chloride Z tetrahydrofuran solution, and hydrogen chloride dimethoxyethane solution.
- the amount of the chlorinating agent used is usually 1 to 20 mol per 1 mol of the product obtained in step (B).
- the amount of hydrogen chloride used as the chlorinating agent is preferably 5 to 15 mol with respect to 1 mol of the product obtained in step (B).
- Chlorination is usually carried out in the presence of a solvent.
- Solvents include toluene, xylene, Examples thereof include aromatic hydrocarbon solvents such as black benzene, aliphatic hydrocarbon solvents such as hexane, heptane, and cyclohexane, ether solvents such as tetrahydrofuran and dioxane, water, and the like. These solvents may be used alone or in admixture of two or more.
- hydrogen chloride is used as the chlorinating agent, a mixed solvent of water and an organic solvent that is immiscible with water, such as an aromatic hydrocarbon solvent or an aliphatic hydrocarbon solvent, is used. It is preferred to carry out chlorination in a layer system.
- the amount of the solvent used is not particularly limited, but considering volumetric efficiency, it is practically not more than 100 parts by weight with respect to 1 part by weight of the product obtained in the step (B).
- the chlorination temperature is usually from 50 to 1 1 O t.
- Chlorination is usually carried out by mixing the product obtained in step (B) with a chlorinating agent.
- the mixing order is not particularly limited.
- Chlorination is usually carried out under normal pressure conditions, but may be carried out under pressurized conditions.
- chlorination may be carried out in a closed container such as an autoclave.
- the progress of chlorination can be confirmed by ordinary analytical means such as gas chromatography and liquid chromatography.
- a reaction mixture containing 4-chloromethyl-2,3,5,6-tetrafluorobenzenemethanol is obtained as a product.
- the obtained reaction mixture may be used as it is in the next step (D), but it is subjected to usual post-treatment such as liquid separation and extraction, and 4-chloromethyl-2,3,5,6-tetrafluorobenzene. It is preferable to obtain an organic layer containing methanol and use the organic layer in the step (D). For such post-treatment, if necessary, water or an organic solvent immiscible with water may be used. In addition, the obtained organic layer may be concentrated to remove 4-chloromethyl-2,3,5,6-tetrafluorobenzenemethanol and used in step (D).
- the product obtained in the unreacted step (B) may be contained in the aqueous layer obtained in the above-mentioned post-treatment, and the aqueous layer is neutralized with a base and then subjected to treatments such as extraction and concentration. As a result, the product obtained in the unreacted step (B) can be recovered.
- a base usually water
- An inorganic base such as sodium oxide, potassium hydroxide, sodium carbonate, potassium carbonate or an aqueous solution thereof is used.
- Step (D) is a step of hydrogenating the product obtained in step (C).
- Hydrogenation is usually carried out by contacting the product obtained in step (C) with hydrogen in the presence of a metal catalyst.
- the hydrogen pressure is not particularly limited, but is usually normal pressure to IMPa.
- a metal catalyst containing at least one metal atom selected from cobalt, iron, nickel, platinum, palladium and rhenium is used.
- the above metals or their alloys may be used as they are, or may be supported on a carrier.
- a sponge metal catalyst can also be used as the metal catalyst.
- the “sponge metal catalyst” is an alloy of an alkali or acid insoluble in an alkali or acid such as nickel or cobalt and an alkali or acid soluble metal such as aluminum, silicon, zinc or magnesium. This means a porous metal catalyst obtained by eluting a metal soluble in water with an alkali or acid, and examples thereof include sponge cobalt and sponge nickel.
- a metal or alloy When a metal or alloy is used as it is as the metal catalyst, it is preferable to use a metal or alloy having a small particle size.
- the carrier include activated carbon, alumina, silica, zeolite, etc., activated carbon is preferable from the viewpoint of availability, and the particle size is small from the viewpoint of reaction activity.
- a carrier is preferred.
- a metal catalyst containing water may be used.
- a metal catalyst one in which palladium metal is supported on a carrier is preferable, and paradimunocarbon is more preferable.
- the amount of the metal catalyst used varies depending on the form, but is usually 0.1 to 150% by weight based on 1 part by weight of the product obtained in step (C).
- the solvent is not particularly limited as long as it is inert to the reaction, and is an aromatic hydrocarbon solvent such as toluene, xylene, black benzene, Aliphatic hydrocarbon solvents such as pentane, hexane and heptane, ether solvents such as jetyl ether and methyl tert-butyl ether, ester solvents such as ethyl acetate, methanol, ethanol, isopropanol, n-butanol and tert-butyl Alcohol solvents such as Yunol; water and the like. These solvents may be used alone or in combination. > The amount of the solvent used is not particularly limited, but considering volumetric efficiency, it is practically 20 parts by weight or less per 1 part by weight of the compound obtained in the step (C).
- the hydrogenation temperature is usually from 50 to 1550.
- Bases include alkali metal hydroxides such as sodium hydroxide and potassium hydroxide, alkaline earth metal hydroxides such as magnesium hydroxide and calcium hydroxide, alkali metal carbonates such as sodium carbonate and potassium carbonate, carbonic acid Examples thereof include inorganic bases such as alkaline earth metal carbonates such as magnesium and calcium carbonate, alkaline earth metal oxides such as magnesium oxide and calcium oxide, alkaline earth metal oxides are preferable, and magnesium oxide is more preferable.
- a reaction mixture containing 4-methyl-2,3,5,6-tetrafluorobenzene methanol is obtained as the product.
- water and, if necessary, an organic solvent immiscible with water are added and washed, and the resulting organic layer is concentrated. Then, 4-methyl-1,2,3,5,6-tetrafluorobenzenemethanol can be taken out.
- organic solvents that are insoluble in water include toluene, xylene, and black ben: aromatic hydrocarbon solvents such as ifon, aliphatic hydrocarbon solvents such as pentane, hexane, and heptane, dichloromethane, dichloroethane, and black form. And halogenated hydrocarbon solvents, ether solvents such as jetyl ether and methyl tert-butyl ether, and ester solvents such as ethyl acetate.
- the resulting 4-methyl-2,3,5,6-tetrafluorobenzenemethanol can be purified by conventional purification methods such as distillation and column chromatography. It may be further purified by stages.
- the insoluble matter such as the metal catalyst removed from the reaction mixture may be reused as it is or after washing with an organic solvent, water, acid or base as the metal catalyst in this step (D). Yes.
- Example 1 The insoluble matter such as the metal catalyst removed from the reaction mixture may be reused as it is or after washing with an organic solvent, water, acid or base as the metal catalyst in this step (D). Yes.
- the resulting potassium fluoride composition was cooled to 100 and mixed with 22 g of tetrachloroterephthalic acid dichloride. The resulting mixture was stirred at 145 for 3.5 hours to react. The resulting reaction mixture was cooled to 100, 100 g of toluene was added, and the mixture was further cooled to room temperature. 15 g of methanol was added dropwise to the obtained mixture, nitrogen gas was blown into the mixture, and the resulting mixture was stirred at room temperature for 12 hours while removing the generated hydrogen fluoride gas outside the flask. The precipitated solid was removed by filtration. The solid was washed with 10 g of toluene.
- the obtained filtrate and washings were mixed, 100 g of water was added, and then the pH of the aqueous layer was adjusted to 7 with 60 Omg of potassium carbonate.
- the obtained mixture was separated into an organic layer and an aqueous layer, and the obtained organic layer was concentrated with an evaporator (decompression degree 10 to 10 O kPa, water bath 30 to 50 :) to obtain an oily residue. With residue and water 110 As a result, crystals were precipitated. Further, the mixture was concentrated with an evaporator (with a reduced pressure of 10 to 100 kPa, in a water bath of 30 to 50), and toluene contained in the residue was removed together with about 5 g of water.
- a 50 OmL flask equipped with a reflux condenser was charged with 23 g of potassium fluoride (spray-dried product), 85 g of dimethylsulfone and 30 g of toluene, and heated to 130 to remove water. After dehydration, the resulting mixture was kept at 140 until no toluene was distilled off. Further, the pressure was reduced to 2 OmmHg, and toluene was almost completely distilled off. Then, the pressure was returned to normal pressure with nitrogen and cooled to loot to obtain a potassium fluoride composition.
- Tetrachloroterephthalic acid dichloride (17 g) and toluene (1.5 g) were added to the obtained potassium fluoride composition, and the mixture was stirred at 145: for 3 hours to be reacted.
- the resulting reaction mixture was cooled to 110, toluene 30 O g was added, and the mixture was further cooled to 6 Ot.
- After adding 100 g of methanol to the obtained mixture the mixture was stirred at room temperature for 10 hours while blowing nitrogen gas.
- the obtained mixture was concentrated, and 200 g of water and 6.9 g of potassium carbonate were added to the obtained residue.
- the obtained mixture was stirred and then separated to obtain an organic layer.
- a 20 OmL flask equipped with a reflux condenser and a Soxhlet extraction tube was charged with 30 g of methanol and 100 g of toluene, and a Soxhlet extraction tube with 20 g of potassium fluoride.
- the flask contents were heated to 100 and methanol was refluxed for 18 hours.
- the fluoride power in the Soxhlet extraction tube had completely disappeared, and a potassium fluoride dispersion was obtained.
- the potassium fluoride dispersion was heated at 90 to 100 under normal pressure to distill off 30 g of a mixed solution of methanol and toluene.
- the obtained potassium fluoride fine powder 960 mg, sulfolane 3 g and toluene 3 g were charged in a 5 O mL flask equipped with a reflux condenser and a water separation tube. The resulting mixture was refluxed at 130 for 30 minutes to remove the contained water, and toluene was distilled off at 140 to obtain a potassium fluoride composition.
- the resulting potassium fluoride composition was cooled to 100 and mixed with tetrachloroterephthalic acid dichloride 6 8 O mg. The resulting mixture was stirred at 1500 for 4 hours to react. The obtained reaction mixture was cooled to room temperature, 5 g of methanol was added, and the mixture was stirred at room temperature for 1 hour. To this, 10 g of ethyl acetate was added, and a mixture containing dimethyl 2,2,3,5,6-tetrafluoroterephthalate was obtained. When the obtained mixture was analyzed by gas chromatography internal standard method, the yield was 70%.
- a 20 O mL flask equipped with a reflux condenser was charged with 500 g of sulfolane and heated to an internal temperature of 140.
- 150 g of potassium fluoride and 500 g of methanol were added, and a methanol solution of potassium fluoride was obtained from the resulting mixture by decantation.
- methanol solution was dropped into the sulfolane, methanol was distilled with the dropping.
- the distilled methanol was collected and mixed with the solid potassium fluoride obtained by the decantation to prepare a methanol solution of potassium fluoride.
- the methanol solution was dropped into the 20 O mL flask.
- Methanol was distilled off along with the dropwise addition. After almost no methanol distills, the methanol was further distilled off at 160 and 2.7 kPa to obtain a fluorinated rhodium composition substantially free of methanol.
- the resulting potassium fluoride composition was cooled to 100 and mixed with tetrachloroterephthalic acid dichloride O 1 Og. The obtained mixture was stirred at 145: for 10 hours to be reacted.
- the resulting reaction mixture was cooled to 100, 300 g of toluene was added, and then cooled to room temperature.
- 75 g of methanol was added dropwise, nitrogen gas was blown into the mixture, and the resulting mixture was stirred at room temperature for 12 hours while removing the generated hydrogen fluoride gas outside the flask.
- the precipitated solid was removed by filtration.
- the obtained solid was washed with 50 g of toluene.
- the obtained filtrate and washings were mixed, 500 g of water was added, and the pH of the aqueous layer was adjusted to 8 with 4 g of potassium carbonate.
- the obtained mixture was separated into an organic layer and an aqueous layer, and the obtained organic layer was concentrated with an evaporator (decompression degree: 10 to 100 kPa, water bath: 30 to 50) to obtain an oily residue.
- an evaporator decompression degree: 10 to 100 kPa, water bath: 30 to 50
- crystals were precipitated.
- the mixture was concentrated with an evaporator (decompression degree: 10-100 kPa, water bath: 30-50 t), and toluene contained in the residue was removed together with about 20 g of water.
- a 20 OmL flask equipped with a reflux condenser was charged with 97 g of sulfolane and heated to 14 Ot :.
- a solution of potassium fluoride prepared by mixing 30 g of potassium fluoride and 350 g of methanol and heating and refluxing for 30 minutes was dropped, methanol was dropped. Methanol was distilled off.
- 10 g of toluene was added, and the mixture was further heated at 140.
- the remaining methanol and toluene were distilled off under conditions of 2.7 kPa at 160 to obtain a fluorination power lithium substantially free of methanol.
- a composition was obtained.
- the obtained potassium fluoride composition was cooled to 100 and mixed with 22 g of tetrachloroterephthalic acid dichloride. The resulting mixture was stirred at 14 for 4 hours to react. The obtained reaction mixture was cooled to 100, and 100 g of toluene was added, and further cooled to room temperature. The resulting mixture was filtered to remove insolubles. The obtained insoluble matter was washed with 20 g of toluene, and the obtained filtrate and washing solution were mixed. The obtained solution was dropped into a mixture of 7.6 g of potassium hydroxide and 00 g of water, and the precipitated solid was obtained by filtration.
- the obtained solid was washed with 10 g of water and then dried to obtain crystals of 2, 3, 5, 6-tetrafluoroterephthalic acid.
- the obtained filtrate and washing solution were mixed, and the obtained mixture was separated into an organic layer and an aqueous layer.
- the obtained aqueous layer was concentrated to about half volume, and the precipitated solid was filtered and then dried to obtain crystals of 2, 3, 5, 6-tetrafluoroterephthalic acid.
- the obtained crystals were mixed to obtain 15.9 g of 2, 3, 5, 6-tetrafluoroterephthalic acid.
- the crystals were analyzed by liquid chromatography-absolute calibration curve. The purity was 85%. Yield: 88%.
- a 50 OmL flask equipped with a reflux condenser was charged with 3 15 g of sulfolane, depressurized to 37.3 kPa, and heated to 1 30.
- a solution prepared by dissolving 61.3 g of potassium fluoride in 810 g of methanol was dropped over 6 hours, the dropwise addition of the solution in which methanol was distilled off was completed. After almost no methanol was distilled, the remaining methanol was distilled off under the conditions of 160 V / 2.7 kPa to obtain a potassium fluoride composition substantially free of methanol.
- the obtained potassium fluoride composition was cooled to 120 at normal pressure and mixed with 45 g of tetrachloroterephthalic acid dichloride. The resulting mixture was stirred at 140 at 4 hours for reaction. The obtained reaction mixture was cooled to 40, depressurized to 2.7 kPa, and then heated to 160 to obtain 25.2 g of a fraction at a tower top temperature of 95-96. The fraction contained 2,3,5,6-tetrafluoroterephthalic acid difluoride, and its content was 94.6% by weight. Yield: 75%.
- Example 7 ⁇ Process (B)>
- a 20 OmL flask equipped with a reflux condenser was charged with 9.4 g of sodium borohydride and 100 g of tetrahydrofuran at room temperature. To this was added a solution prepared by dissolving 28.5 g of dimethyl 2,3,5,6-tetrafluoroterephthalate in 100 g of tetrahydrofuran. The resulting mixture was adjusted to 60, and 26 g of 35 wt% hydrochloric acid was added dropwise over 5 hours while stirring. The resulting mixture was stirred at the same temperature for 2 hours and then cooled to room temperature. To the obtained reaction mixture, 120 g of 5 wt% hydrochloric acid was added, stirred and allowed to stand.
- a 20 OmL flask equipped with a reflux condenser was charged with 4.6 g of sodium borohydride and 50 g of tetrahydrofuran at room temperature. To this was added a solution prepared by dissolving 14.7 g of dimethyl 2,3,5,6-tetrafluoroterephthalate in 50 g of tetrahydrofuran. The obtained mixture was adjusted to 60, and 13 g of 45 wt% sulfuric acid was added dropwise over 5 hours while stirring. The resulting mixture was stirred at the same temperature for 2 hours and then cooled to room temperature. To the resulting reaction mixture, 50 g of water was added, stirred and allowed to stand.
- a 20 OmL flask equipped with a reflux condenser was charged with 1.7 g of sodium borohydride and 30 g of tetrahydrofuran at room temperature. To this was added a solution prepared by dissolving 6.0 g of dimethyl 2,3,5,6-tetrafluoroterephthalate obtained in Example 4 in 20 g of tetrahydrofuran. The obtained mixture was adjusted to 50, and a solution obtained by mixing 10.2 g of 35 wt% hydrochloric acid and 10 g of tetrahydrofuran was added dropwise over 5 hours while stirring. The resulting mixture was stirred at the same temperature for 2 hours and then cooled to room temperature.
- Example 4 A 20 OmL flask equipped with a reflux condenser was charged with 1.7 g of sodium borohydride and 3.0 g of tetrahydrofuran at room temperature. To this, 2, 3, 5, obtained in Example 4 A solution prepared by dissolving 6.0 g of dimethyl 6-tetrafluoroterephthalate in 20 g of tetrahydrofuran was added. The resulting mixture was adjusted to 50, and a solution obtained by mixing 3 g of acetic acid and 10 g of tetrahydrofuran was added dropwise over 5 hours while stirring. The resulting mixture was stirred at the same temperature for 2 hours and then cooled to room temperature.
- a 20 OmL flask equipped with a reflux condenser was charged with 830 mg of sodium borohydride, 10 g of tetrahydrofuran and 2.66 g of dimethyl 2,2,5,6-tetrafluoroterephthalate at room temperature.
- the obtained mixture was adjusted to 65, and a solution obtained by mixing 395 mg of water and 10 g of tetrahydrofuran was added dropwise over 3 hours while stirring.
- the resulting mixture was stirred at the same temperature for 2 hours and then cooled to room temperature.
- 20 g of 10 wt% hydrochloric acid was added dropwise at 25-30 over 30 minutes, and the mixture was stirred at the same temperature for 1 hour.
- a 20 OmL flask equipped with a reflux condenser was charged with 2.58 g sodium borohydride and 25 g dimethoxyethane at room temperature. Adjust the resulting mixture to 50 and stir Then, a solution obtained by mixing 6.10 g of 2,3,5,6-tetrafluoroterephthalic acid and 20 g of dimethoxyethane was added dropwise over 1 hour. The resulting mixture was stirred at 60 for 7 hours. To the resulting reaction mixture, 20 g of toluene was added, and the mixture was cooled to 50, then 8.5 g of 35 wt% hydrochloric acid was added dropwise over 1 hour, and the mixture was stirred at 6 O for 6 hours.
- the crystal contained 0.5% of 1,4 monobis (chloromethyl) -1,2,3,5,6-tetrafluorobenzene.
- the crystals contained 2.9% 1,4-bis (chloromethyl) 1,2,3,5,6-tetrafluorobenzene.
- Example 20 ⁇ Process (D)>
- 4-methyl-2,3,5,6_-tetrafluoro oral benzyl alcohol can be advantageously produced.
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CN200880004803.7A CN101610988B (zh) | 2007-02-16 | 2008-02-14 | 4-甲基-2,3,5,6-四氟苄醇的制造方法 |
EP08711703.2A EP2123624B1 (en) | 2007-02-16 | 2008-02-14 | Method for producing 4-methyl-2,3,5,6-tetrafluorobenzyl alcohol |
ES08711703T ES2405321T3 (es) | 2007-02-16 | 2008-02-14 | Procedimiento para producir alcohol 4-metil-2,3,5,6-tetrafluorobencílico |
US12/525,913 US8039680B2 (en) | 2007-02-16 | 2009-02-14 | Process for producing 4-methyl-2,3,5,6-tetrafluorobenzyl alcohol |
IL200162A IL200162A (en) | 2007-02-16 | 2009-07-30 | Process for the production of 4-methyl-2,3,5,6 tetrafluorobenzyl alcohol |
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EP (2) | EP2471766B1 (ja) |
JP (1) | JP5326293B2 (ja) |
CN (1) | CN101610988B (ja) |
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JP2009073725A (ja) * | 2007-08-29 | 2009-04-09 | Sumitomo Chemical Co Ltd | アルカリ金属フッ化物分散液およびそれを用いる含フッ素有機化合物の製造方法 |
WO2024070904A1 (ja) * | 2022-09-28 | 2024-04-04 | 旭化成株式会社 | 粉末ポリアミドの製造方法 |
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KR20090015076A (ko) | 2006-04-27 | 2009-02-11 | 스미또모 가가꾸 가부시키가이샤 | 불화칼륨 분산액 및 그것을 이용하는 불소 함유 유기 화합물의 제조 방법 |
JP5617166B2 (ja) | 2009-02-09 | 2014-11-05 | 日本電気株式会社 | 回転推定装置、回転推定方法およびプログラム |
JP6051794B2 (ja) * | 2011-11-10 | 2016-12-27 | 住友化学株式会社 | 4−ヒドロキシメチル−2,3,5,6−テトラフルオロトルエンの製造方法 |
CN107827708B (zh) * | 2017-11-06 | 2020-09-29 | 大连奇凯医药科技有限公司 | 一种制备多氟苄醇的方法 |
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2008
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- 2008-02-14 CN CN200880004803.7A patent/CN101610988B/zh not_active Expired - Fee Related
- 2008-02-14 EP EP08711703.2A patent/EP2123624B1/en not_active Not-in-force
- 2008-02-14 ES ES12161764T patent/ES2427940T3/es active Active
- 2008-02-14 JP JP2008032762A patent/JP5326293B2/ja not_active Expired - Fee Related
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- 2008-02-14 WO PCT/JP2008/052914 patent/WO2008099966A1/ja active Application Filing
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EP2123624B1 (en) | 2013-04-17 |
US8039680B2 (en) | 2011-10-18 |
EP2123624A4 (en) | 2010-12-01 |
IL200162A0 (en) | 2010-04-15 |
JP2008222710A (ja) | 2008-09-25 |
EP2123624A1 (en) | 2009-11-25 |
US20100324344A1 (en) | 2010-12-23 |
EP2471766A1 (en) | 2012-07-04 |
IL200162A (en) | 2013-10-31 |
ES2405321T3 (es) | 2013-05-30 |
JP5326293B2 (ja) | 2013-10-30 |
EP2471766B1 (en) | 2013-09-04 |
CN101610988B (zh) | 2013-04-17 |
CN101610988A (zh) | 2009-12-23 |
ES2427940T3 (es) | 2013-11-04 |
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