WO2015108171A1 - 高純度の1,3-ジアルキルシクロブタン-1,2,3,4-テトラカルボン酸-1,2:3,4-二無水物の製造方法 - Google Patents
高純度の1,3-ジアルキルシクロブタン-1,2,3,4-テトラカルボン酸-1,2:3,4-二無水物の製造方法 Download PDFInfo
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- WO2015108171A1 WO2015108171A1 PCT/JP2015/051150 JP2015051150W WO2015108171A1 WO 2015108171 A1 WO2015108171 A1 WO 2015108171A1 JP 2015051150 W JP2015051150 W JP 2015051150W WO 2015108171 A1 WO2015108171 A1 WO 2015108171A1
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- dacbda
- dianhydride
- tetracarboxylic acid
- anhydride
- dialkylcyclobutane
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D493/00—Heterocyclic compounds containing oxygen atoms as the only ring hetero atoms in the condensed system
- C07D493/02—Heterocyclic compounds containing oxygen atoms as the only ring hetero atoms in the condensed system in which the condensed system contains two hetero rings
- C07D493/04—Ortho-condensed systems
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D307/00—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
- C07D307/02—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings
- C07D307/34—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
- C07D307/56—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D307/60—Two oxygen atoms, e.g. succinic anhydride
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1003—Preparatory processes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1003—Preparatory processes
- C08G73/1007—Preparatory processes from tetracarboxylic acids or derivatives and diamines
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1003—Preparatory processes
- C08G73/1007—Preparatory processes from tetracarboxylic acids or derivatives and diamines
- C08G73/101—Preparatory processes from tetracarboxylic acids or derivatives and diamines containing chain terminating or branching agents
- C08G73/1014—Preparatory processes from tetracarboxylic acids or derivatives and diamines containing chain terminating or branching agents in the form of (mono)anhydrid
Definitions
- the present invention provides a high-purity 1,3-dialkylcyclobutane-1,2,3,4-tetracarboxylic acid-1,2: 3,4-dianhydride which can be a raw material monomer such as polyimide for optical materials. It relates to a manufacturing method.
- a polyimide resin is widely used as an electronic material such as a protective material or an insulating material in a liquid crystal display element or a semiconductor because of its high mechanical strength, heat resistance, insulation, solvent resistance, and the like.
- an optical communication material such as an optical waveguide material is also expected.
- the development of this field has been remarkable, and correspondingly, higher and higher properties are required for the materials used. That is, it is expected not only to be excellent in heat resistance and solvent resistance, but also to have a large number of performances depending on the application.
- Patent Document 3 shows the following scheme.
- 1,3-dimethylcyclobutane-1,2,3,4-tetracarboxylic acid-1,2: 3,4-dianhydride is obtained by photodimerization reaction of citraconic anhydride (abbreviated as MMA).
- MMA citraconic anhydride
- Product (1,3-DMCBDA) and 1,2-dimethylcyclobutane-1,2,3,4-tetracarboxylic acid-1,2: 3,4-dianhydride (1,2-DMCBDA) Is disclosed.
- 1,3-DMCBDA when 1,3-DMCBDA is compared with 1,2-DMCBDA, the former 1,3-DMCBDA having a highly symmetric structure produces a higher molecular weight polyimide than the latter 1,2-DMCBDA. And is known to be more useful.
- Patent Document 3 describes that a mixture of 1,3-DMCBDA and 1,2-DMCBDA can be obtained, the highly useful former 1,3-DMCBDA is highly purified, and There is no description about obtaining with high efficiency.
- the object of the present invention is to provide 1,3-dialkylcyclobutane-1,2,3,4-tetracarboxylic acid-1,2: 3,4-dianhydride (for example, obtained by photodimerization reaction of a maleic anhydride compound) 1,2-DACBDA) and 1,2-dialkylcyclobutane-1,2,3,4-tetracarboxylic acid-1,2: 3,4-dianhydride (hereinafter, 1,2- Another object of the present invention is to provide a method for obtaining the former 1,3-DACBDA with high purity and high efficiency from a mixture containing DACBDA.
- 1,3-DACBDA and 1,2-DACBDA have a solubility in a heated organic solvent, particularly a specific organic solvent. It was found that the solubility of the former was extremely small compared to the latter, and a method for separating both of them by using the difference in solubility to obtain high-purity 1,3-DACBDA with high efficiency was obtained.
- the present invention has the following gist.
- a mixture of 1,3-DACBDA and 1,2-DACBDA is heated in an organic solvent, cooled and then filtered to obtain a high purity 1,3-dialkyl-1,2,3,4-
- the organic solvent is an ester or anhydride of an organic carboxylic acid or a carbonate ester having a boiling point of 50 to 200 ° C.
- the soluble solvent is acetic anhydride. 4).
- high-purity 1,3-dialkylcyclobutane-1,2,3,4-tetracarboxylic acid-1,2: 3,4-dianhydride (1,3-DACBDA) is obtained. It can be obtained simply, efficiently and at a high recovery rate.
- a mixture of 1,3-DACBDA and 1,2-DACBDA, which is a raw material in the production method of the present invention, is typically represented by the following photodimerization reaction of a maleic anhydride compound represented by the formula (1).
- the reaction scheme can be obtained.
- R represents an alkyl group having 1 to 20, preferably 1 to 12, and more preferably 1 to 6 carbon atoms. Particularly preferred is methyl.
- the alkyl group having 1 to 20 carbon atoms may be a linear or branched saturated alkyl group or a linear or branched unsaturated alkyl group. Specific examples thereof include methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl, t-butyl, n-pentyl, 1-methyl-n-butyl, 2-methyl- n-butyl, 3-methyl-n-butyl, 1,1-dimethyl-n-propyl, n-hexyl, 1-methyl-n-pentyl, 2-methyl-n-pentyl, 1,1-dimethyl-n- Butyl, 1-ethyl-n-butyl, 1,1,2-trimethyl-n-propyl, n-heptyl, n-octyl, n-nonyl, n-decyl, n-dodecyl
- maleic anhydride compound represented by the formula (1) examples include citraconic anhydride, 2-ethyl maleic anhydride, 2-isopropyl maleic anhydride, 2-n-butyl maleic anhydride, 2-t-butyl anhydride.
- Solvents used in the photodimerization reaction include methyl formate, ethyl formate, n-propyl formate, i-propyl formate, n-butyl formate, i-butyl formate, methyl acetate, ethyl acetate, n-propyl acetate, i-acetate.
- Propyl, n-butyl acetate, i-butyl acetate, methyl propionate, ethyl propionate, n-propyl propionate, i-propyl propionate, ethylene glycol diformate, ethylene glycol diacetate, ethylene glycol dipropionate, carbonic acid Dimethyl, diethyl carbonate and the like can be listed.
- the amount of the solvent used is preferably 3 to 300 times by mass and more preferably 3 to 100 times by mass with respect to the maleic anhydride compound.
- the amount of the reaction solvent used is preferably smaller when the reaction is desired to be accelerated or when the yield of the product is desired to be increased.
- the amount of the solvent used is preferably 3 to 10 times by mass with respect to the maleic anhydride compound.
- the wavelength of light is preferably 200 to 400 nm, more preferably 250 to 350 nm, and particularly preferably 280 to 330 nm.
- the light source a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, a xenon lamp, an electrodeless lamp, a light emitting diode, or the like is used.
- light emitting diodes with wavelengths from 275 to 500 nm gave 1,3-DACBDA with improved selectivity.
- the light source cooling tube from quartz glass to pyrex glass, coloring polymer adhesion to the light source cooling tube and impurities are reduced, and 1,3-DACBDA can be obtained with improved selectivity.
- the reaction temperature is preferably from ⁇ 20 to 80 ° C., because a polymer is by-produced when the temperature is high, while the solubility of the maleic anhydride compound is reduced and the production efficiency is reduced when the temperature is low. More preferably, it is ⁇ 10 to 50 ° C., and particularly 0 to 20 ° C. suppresses the formation of by-products such as 1,2-DACBDA, and 1,3-DACBDA is obtained with high selectivity and yield.
- the reaction time varies depending on the charged amount of maleic anhydride compound, the type of light source, and the irradiation amount, but it is performed until the unreacted maleic anhydride compound reaches 0 to 40%, preferably 0 to 10%. Can do.
- the conversion can be easily measured by analyzing the reaction solution by gas chromatography or the like.
- reaction time increases and the conversion rate of the maleic anhydride compound increases, the amount of 1,3-DACBDA deposited increases, and the generated 1,3-DACBDA begins to adhere to the outer wall (reaction solution side) of the light source cooling tube.
- coloration of crystals due to concurrent decomposition reactions and reduction in light efficiency are observed. Therefore, in order to increase the conversion rate of the maleic anhydride compound, it is not preferable to spend a long time in one batch with a decrease in production efficiency in practice.
- the reaction can be carried out batchwise or flow-through, and can be carried out at normal pressure or under pressure.
- the precipitate in the reaction solution is filtered, and the filtered product is washed with an organic solvent and then dried under reduced pressure to obtain a mixture of 1,3-DACBDA and 1,2-DACBDA.
- the amount of the organic solvent used for washing the filtered material may be an amount that can transfer the precipitate remaining in the reaction tank to the filter, but if the amount of the organic solvent is large, the target product is transferred to the filtrate. The recovery rate tends to decrease. For this reason, the amount of the organic solvent used for washing the filtered product is preferably 0.5 to 10 times by weight, more preferably 1 to 2 times by weight, based on the maleic anhydride compound used in the reaction.
- the solvent used for washing the filtered product is not particularly limited. However, when a solvent having a high solubility of 1,3-DACBDA, which is the target product, is used, the target product is transferred to the filtrate, and the recovery rate tends to decrease. Therefore, the organic solvent used for washing the filtered product is methyl formate, ethyl formate, n-propyl formate, i-propyl formate, n-butyl formate, i-butyl formate, which are solvents used for the photodimerization reaction, Methyl acetate, ethyl acetate, n-propyl acetate, i-propyl acetate, n-butyl acetate, i-butyl acetate, methyl propionate, ethyl propionate, n-propyl propionate, i-propyl propionate, ethylene glycol diformol Mate, ethylene glycol diacetate, ethylene glycol diprop
- the photodimerization reaction of the maleic anhydride compound can also be performed in the presence of a sensitizer.
- a sensitizer benzophenone, anthraquinone, acetophenone, benzaldehyde and the like are preferable.
- benzophenone substituted with an electron withdrawing group, acetophenone substituted with an electron withdrawing group, or benzaldehyde substituted with an electron withdrawing group are 1,3-DACBDA and 1,2-DACBDA with high photoreaction efficiency. Is preferable.
- the amount of the sensitizer used is preferably 0.1 to 20 mol%, more preferably 0.1 to 5 mol%, based on the maleic anhydride compound.
- a reaction mixture liquid containing a mixture of 1,3-DACBDA and 1,2-DACBDA is obtained as described above.
- the reaction mixture liquid since 1,3-DACBDA and 1,2-DACBDA are both present as solids, the reaction mixture liquid is filtered and isolated from 1,3-DACBDA and 1,2-DACBDA. It is used as a raw material for obtaining high purity 1,3-DACBDA in the invention.
- the organic solvent contained in the reaction mixture including a mixture of 1,3-DACBDA and 1,2-DACBDA is an organic solvent that can be used in the subsequent production of high-purity 1,3-DACBDA.
- the reaction mixture containing a mixture of 1,3-DACBDA and 1,2-DACBDA can be used as a raw material as it is.
- a mixture of 1,3-DACBDA and 1,2-DACBDA is isolated from the reaction mixture liquid and preferably washed, it is preferable because high-purity 1,3-DACBDA can be easily obtained.
- a mixture of 1,3-DACBDA and 1,2-DACBDA is heated in an organic solvent, cooled, and then filtered to obtain a high-purity 1,3-dialkyl-1 , 2,3,4-Cyclobutanetetracarboxylic acid-1,2: 3,4-dianhydride can be obtained as a solid by filtration to obtain 1,3-DACBDA with high recovery and high purity. .
- organic solvent used here many organic solvents do not react with 1,3-DACBDA and 1,2-DACBDA in the heated state, and the solubility in 1,3-DACBDA is small, while 1, It can be used because of its high solubility in 2-DACBDA.
- Such an organic solvent preferably has a boiling point of preferably 30 to 200 ° C, more preferably 50 to 180 ° C.
- the organic solvent is preferably an ester or anhydride of an organic carboxylic acid or a carbonate ester.
- the ester of the organic carboxylic acid is represented by the formula: R 1 COOR 2 (where R 1 is hydrogen or an alkyl group having 1 to 4 carbon atoms, more preferably 1 or 2 carbon atoms, and R 2 has a carbon number. 1 to 4 and more preferably 1 to 3 alkyl groups).
- esters of organic carboxylic acids include ethyl formate, n-propyl formate, i-propyl formate, n-butyl formate, i-butyl formate, methyl acetate, ethyl acetate, n-propyl acetate, i-propyl acetate, Examples include n-butyl acetate, i-butyl acetate, methyl propionate, ethyl propionate, n-propyl propionate, i-propyl propionate, n-butyl propionate, and i-butyl propionate.
- ethylene glycol diformate, ethylene glycol diacetate, ethylene glycol dipropionate and the like can be used.
- anhydride of an organic carboxylic acid the formula: (R 1 CO) 2 O (.
- R 1 is a preferred embodiment be included as defined above) are preferably those represented by.
- Preferred examples thereof are propionic anhydride, butyric anhydride, trifluoroacetic anhydride, or acetic anhydride. Of these, acetic anhydride is preferred because 1,3-DACBDA can be obtained at a higher recovery rate.
- the carbonic acid ester is preferably a carbonic acid dialkyl ester having an alkyl carbon number of preferably 1 to 3, more preferably 1 or 2.
- Preferred examples thereof include dimethyl carbonate, diethyl carbonate, or a mixture thereof.
- the amount of the organic solvent is preferably 2 to 20 parts by mass with respect to 1 part by mass of the mixture of 1,3-DACBDA and 1,2-DACBDA, and 3.5 to 6 masses from the viewpoint of purification efficiency and volumetric efficiency. Part is more preferred.
- the temperature when heating in an organic solvent is usually from 10 ° C. to the boiling point of the organic solvent used, but the organic solvent used from 50 ° C. is effective in dissolving 1,2-DACBDA efficiently.
- a temperature up to the boiling point of is preferred.
- the heating time is preferably 30 minutes to 10 hours, and if it is too short, the purity may decrease. For this reason, 1 to 6 hours are preferable.
- 1,3-DACBDA crystals are precipitated as a solid.
- the liquid containing the 1,3-DACBDA solid is filtered, and the 1,3-DACBDA crystals are separated by filtration to separate 1,2-DACBDA dissolved in the liquid. DACBDA can be obtained.
- the ratio of the mixture of 1,3-DACBDA and 1,2-DACBDA used in the above is not particularly limited, but the purity may decrease when the ratio of 1,2-DACBDA increases. Therefore, the mass ratio of 1,3-DACBDA to 1,2-DACBDA in the mixture used in the present invention is preferably 50:50 to 99.5: 0.5, more preferably 70 : 30 to 99.5: 0.5.
- ⁇ GC analysis conditions Equipment: GC-2010 Plus (SHIMADZU) Column: DB-1 (GL Sciences Inc.) Diameter 0.25 mm x Length 30 m, Film thickness 0.25 um Carrier gas: He Detector: FID Sample injection volume: 1 um Inlet temperature: 160 ° C Detector temperature: 220 ° C Column temperature: 70 ° C (20min)-40 ° C / min-220 ° C (15min) Split ratio: 1:50 Internal reference material: Butyl lactate
- citraconic anhydride (CA) 35.0 g (312 mmol), ethyl acetate 152 g (1720 mmol, citraconic anhydride (CA) 4.33 wt%) was added and dissolved by stirring with a magnetic stirrer, and then irradiated with a 100 W high-pressure mercury lamp for 48 hours while stirring at 5-10 ° C.
- the precipitated white crystals were filtered out at 5-10 ° C., and the crystals were extracted with 43.84g (497 mmol, citraconic acid, ethyl acetate). It was washed twice with 1.25 wt% of anhydrous (CA). This was dried under reduced pressure to obtain 5.8 g of white crystals (yield 16.6%).
- 1,3-DM-CBDA acetic anhydride
- the high purity 1,3-dimethyl-1,2,3,4-cyclobutanetetracarboxylic acid-1,2: 3,4-dianhydride obtained in the present invention is a useful compound as a raw material for polyimide and the like.
- the polyimide is widely used as a resin composition used for electronic materials such as liquid crystal display elements, semiconductor protective materials, and insulating materials.
- the entire contents of the specification, claims, drawings, and abstract of Japanese Patent Application No. 2014-007189 filed on January 17, 2014 are cited herein as disclosure of the specification of the present invention. Incorporated.
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Abstract
Description
近年、この分野の発展は目覚ましく、それに対応して、用いられる材料に対しても益々高度な特性が要求される様になっている。即ち、単に耐熱性、耐溶剤性に優れるだけでなく、用途に応じた性能を多数あわせもつことが期待されている。
しかし、特許文献3には、1,3-DMCBDAと1,2-DMCBDAとの混合物が得られることは記載されているが、有用性の高い前者の1,3-DMCBDAを高純度で、かつ高効率で得ることについての記載はない。
本発明は、下記の要旨を有するものである。
2.前記有機溶媒が、沸点50~200℃を有する、有機カルボン酸のエステル若しくは無水物、又は炭酸エステルである、上記1に記載の製造方法。
3.前記有溶溶媒が、無水酢酸である上記1に記載の製造方法。
4.前記有溶溶媒が、11,3-DACBDAと1,2-DACBDAとの混合物のI質量部に対して2~20質量部使用される上記1~3のいずれか1項に記載の製造方法。
5.前記混合物の有機溶媒中での加熱が、10℃~該有機溶媒の沸点の温度を行われる、上記1~4のいずれか1項に記載の製造方法。
6.前記加熱後に、-10~50℃まで冷却される、上記1~5のいずれか1項に記載の製造方法。
7.前記混合物における1,3-DACBDAと1,2-DACBDAとの質量比率が、50:50~99.5:0.5である上記1~6のいずれか1項に記載の製造方法。
8.前記1,3-DACBDAと1,2-DACBDAとの混合物が、無水マレイン酸の光二量化反応により得られる上記1~7のいずれか1項に記載の製造方法。
9.1,3-DACBDA及び1,2-DACBDAの有するアルキル基がメチル基である、上記1~8のいずれか1項に記載の製造方法。
なお、nはノルマルを、iはイソを、sはセカンダリーを、tはターシャリーを、それぞれ表す。
光二量化反応で用いられる溶媒としては、ギ酸メチル、ギ酸エチル、ギ酸n-プロピル、ギ酸i-プロピル、ギ酸n-ブチル、ギ酸i-ブチル、酢酸メチル、酢酸エチル、酢酸n-プロピル、酢酸i-プロピル、酢酸n-ブチル、酢酸i-ブチル、プロピオン酸メチル、プロピオン酸エチル、プロピオン酸n-プロピル、プロピオン酸i-プロピル、エチレングリコールジホルメート、エチレングリコールジアセテート、エチレングリコールジプロピオネート、炭酸ジメチル、炭酸ジエチル等を列記することができる。
なお、反応溶媒の使用量は反応を速くしたい場合や、生成物の収量を多くしたい場合は少ない方が好ましく、例えば、無水マレイン酸化合物の濃度が濃くなると、反応が速くなり、得られる生成物の収量が多くなる。従って、反応を速くしたい場合や、生成物の収量を多くしたい場合は、溶媒の使用量は無水マレイン酸化合物に対して3~10質量倍が好ましい。
特に、275~500nmの波長を有する発光ダイオードが、改良された選択率で1,3-DACBDAを与えた。また、光源冷却管を石英ガラスからパイレックスガラスに変えることにより、光源冷却管への着色ポリマー付着や不純物が減少し、改良された選択率で1,3-DACBDAが得られる。
ろ取物の洗浄に使用する有機溶媒の量は、反応槽内に残存した析出物をろ過器へ移送できる量であればよいが、有機溶媒の量が多い場合には目的物がろ液へ移行してしまい回収率が低下しやすい。このため、ろ取物の洗浄に使用する有機溶媒の量は、反応に使用した無水マレイン酸化合物に対し、0.5~10重量倍が好ましく、より好ましくは1~2重量倍である。
使用する増感剤の量は、無水マレイン酸化合物に対し、好ましくは0.1~20モル%、より好ましくは0.1~5モル%である。
かかる有機溶媒としては、沸点が 好ましくは30~200℃、より好ましくは50~180℃を有するものが好ましい。かかる有機溶媒としては、ヘキサン、ヘプタン、アセトニトリル、アセトン、クロロホルム、トルエンなども使用できる。特に、有機溶媒としては、有機カルボン酸のエステル若しくは無水物、又は炭酸エステルが好ましい。
有機カルボン酸のエステルの好ましい例としては、ギ酸エチル、ギ酸n-プロピル、ギ酸i-プロピル、ギ酸n-ブチル、ギ酸i-ブチル、酢酸メチル、酢酸エチル、酢酸n-プロピル、酢酸i-プロピル、酢酸n-ブチル、酢酸i-ブチル、プロピオン酸メチル、プロピオン酸エチル、プロピオン酸n-プロピル、プロピオン酸i-プロピル、プロピオン酸n-ブチル、プロピオン酸i-ブチルが挙げられる。更に、エチレングリコールジホルメート、エチレングリコールジアセテート、エチレングリコールジプロピオネートなども使用できる。
また、炭酸エステルとしては、アルキルの炭素数が好ましくは1~3、より好ましくは1又は2の炭酸ジアルキルエステルが好適である。その好ましい例としては、炭酸ジメチル、炭酸ジエチル、又はこれらの混合物が挙げられる。
上記加熱後に、好ましくは-10~50℃、より好ましくは-10~20℃に冷却することにより、1,3-DACBDAの結晶が固体として析出する。かかる1,3-DACBDAの固体を含む液体を濾過し、1,3-DACBDAの結晶を濾取することにより、液体中に溶解する1,2-DACBDAと分離し、高純度の1,3-DACBDAを得ることができる。
装置 :GC-2010 Plus(SHIMADZU社)
カラム :DB-1(ジーエルサイエンス社)径0.25 mm×長さ30 m、膜厚0.25 um
キャリアガス :He
検出器 :FID
試料注入量 :1 um
注入口温度 :160℃
検出器温度 :220℃
カラム温度 :70℃(20min)-40℃/min-220℃(15min)
スプリット比 :1:50
内部標準物質 :乳酸ブチル
装置 :フーリエ変感型超伝導核磁気共鳴装置(FT-NMR)INOVA-400(Varian社) 400 MHz
溶媒 :DMSO-d6
内標準物質 :テトラメチルシラン(TMS)
<融点分析条件>
装置 :DSC1(メトラー・トレド社)
温度 :35℃-5℃/min-400℃
パン :Au(密閉)
1H NMR ( DMSO-d6, δ ppm ) ( 1,3-DM-CBDA ): 1.38 ( s, 6H ), 3.89 ( s, 2H ).
1H NMR ( DMSO-d6, δ ppm ) ( 1,2-DM-CBDA ): 1.37 ( s, 6H ), 3.72 ( s, 2H ).
mp. ( 1,3-DM-CBDA ):316-317℃
窒素気流下中、100mLの四つ口フラスコに、参考例1と同様の方法で得られた1,3-DM-CBDAと1,2-DM-CBDAを含む混合物(1,3-DM-CBDA:1,2-DM-CBDA = 70:30)5gを無水酢酸25gとともに仕込み、マグネチックスターラー攪拌下25℃にて懸濁させた後、4時間加熱還流(130℃)させた。その後、内温が20℃になるまで冷却し、1時間20℃で攪拌させた。
窒素気流下中、500mLの四つ口フラスコに、参考例1と同様の方法で得られた1,3-DM-CBDAと1,2-DM-CBDAを含む混合物(1,3-DM-CBDA:1,2-DM-CBDA = 89:11)70g、アセトニトリル420gを仕込み、マグネチックスターラー攪拌下17℃にて懸濁させた後、32℃にて1時間攪拌した。その後、内温が10℃になるまで冷却し、10℃で1時間攪拌させた。
窒素気流下中、500mLの四つ口フラスコに、参考例1と同様の方法で得られた1,3-DM-CBDAと1,2-DM-CBDAを含む混合物(1,3-DM-CBDA:1,2-DM-CBDA = 89:11)80g、酢酸エチル800gを仕込み、マグネチックスターラー攪拌下17℃にて懸濁させた後、50℃にて1時間攪拌した。その後、内温が17℃になるまで冷却し、20℃で1時間攪拌させた。
その後、析出した白色結晶をろ過し、その結晶を酢酸エチル160gで2回洗浄した後、得られた白色結晶を減圧乾燥し、1,3-DM-CBDAと1,2-DM-CBDAの比率が1,3-DM-CBDA:1,2-DM-CBDA = 99.0:1の結晶を得た。なお、この結晶の1,3-DM-CBDAと1,2-DM-CBDAの比率は、1H NMR解析により確認した。その後、窒素気流下中、500mLの四つ口フラスコに得られた結晶全量、酢酸エチル800gを仕込み、マグネチックスターラー攪拌下17℃にて懸濁させた後、50℃にて1時間攪拌した。
その後、内温20℃以下まで冷却し、20℃以下で1時間攪拌させた。その後、析出した白色結晶をろ過し、その結晶を酢酸エチル160gで2回洗浄した後、減圧乾燥することにより、白色結晶53.32g(回収率74.9%)を得た。この結晶は、1H NMR解析により、1,3-DM-CBDAと1,2-DM-CBDAの比率が1,3-DM-CBDA:1,2-DM-CBDA = 99.3:0.7であることを確認した。
なお、2014年1月17日に出願された日本特許出願2014-007189号の明細書、特許請求の範囲、図面及び要約書の全内容をここに引用し、本発明の明細書の開示として、取り入れるものである。
Claims (9)
- 1,3-ジアルキルシクロブタン-1,2,3,4-テトラカルボン酸-1,2:3,4-二無水物と1,2-ジアルキルシクロブタン-1,2,3,4-テトラカルボン酸-1,2:3,4-二無水物との混合物を有機溶媒中で加熱し、冷却し、次いで濾過することにより、高純度の1,3-ジアルキル-1,2,3,4-シクロブタンテトラカルボン酸-1,2:3,4-二無水物を固体として濾取することを特徴とする1,3-ジアルキルシクロブタン-1,2,3,4-テトラカルボン酸-1,2:3,4-二無水物の製造方法。
- 前記有機溶媒が、沸点50~200℃を有する、有機カルボン酸のエステル若しくは無水物、又は炭酸エステルである、請求項1に記載の製造方法。
- 前記有溶溶媒が、無水酢酸である請求項1に記載の製造方法。
- 前記有溶溶媒が、1,3-ジアルキルシクロブタン-1,2,3,4-テトラカルボン酸-1,2:3,4-二無水物と1,2-ジアルキルシクロブタン-1,2,3,4-テトラカルボン酸-1,2:3,4-二無水物との混合物のI質量部に対して2~20質量部使用される請求項1~3のいずれか1項に記載の製造方法。
- 前記混合物の有機溶媒中での加熱が、10℃~該有機溶媒の沸点の温度を行われる、請求項1~4のいずれか1項に記載の製造方法。
- 前記加熱後に、-10~50℃まで冷却される、請求項1~5のいずれか1項に記載の製造方法。
- 前記混合物における1,3-ジアルキルシクロブタン-1,2,3,4-テトラカルボン酸-1,2:3,4-二無水物と1,2-ジアルキルシクロブタン-1,2,3,4-テトラカルボン酸-1,2:3,4-二無水物との質量比率が、50:50~99.5:0.5である請求項1~6のいずれか1項に記載の製造方法。
- 前記1,3-ジアルキルシクロブタン-1,2,3,4-テトラカルボン酸-1,2:3,4-二無水物と1,2-ジアルキルシクロブタン-1,2,3,4-テトラカルボン酸-1,2:3,4-二無水物との混合物が、無水マレイン酸の光二量化反応により得られる、請求項1~7のいずれか1項に記載の製造方法。
- 1,3-ジアルキルシクロブタン-1,2,3,4-テトラカルボン酸-1,2:3,4-二無水物及び1,2-ジアルキルシクロブタン-1,2,3,4-テトラカルボン酸-1,2:3,4-二無水物の有するアルキル基がメチル基である、請求項1~8のいずれか1項に記載の製造方法。
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