WO2006043519A1 - ケージ状シクロブタン酸二無水物及びその製造法 - Google Patents
ケージ状シクロブタン酸二無水物及びその製造法 Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/10—Preparation of carboxylic acid esters by reacting carboxylic acids or symmetrical anhydrides with ester groups or with a carbon-halogen bond
- C07C67/11—Preparation of carboxylic acid esters by reacting carboxylic acids or symmetrical anhydrides with ester groups or with a carbon-halogen bond being mineral ester groups
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- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/09—Preparation of carboxylic acids or their salts, halides or anhydrides from carboxylic acid esters or lactones
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- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/54—Preparation of carboxylic acid anhydrides
- C07C51/56—Preparation of carboxylic acid anhydrides from organic acids, their salts, their esters or their halides, e.g. by carboxylation
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- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C61/00—Compounds having carboxyl groups bound to carbon atoms of rings other than six-membered aromatic rings
- C07C61/04—Saturated compounds having a carboxyl group bound to a three or four-membered ring
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- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/08—Preparation of carboxylic acid esters by reacting carboxylic acids or symmetrical anhydrides with the hydroxy or O-metal group of organic compounds
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- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/12—Preparation of carboxylic acid esters from asymmetrical anhydrides
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- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/30—Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group
- C07C67/333—Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group by isomerisation; by change of size of the carbon skeleton
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- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C69/00—Esters of carboxylic acids; Esters of carbonic or haloformic acids
- C07C69/74—Esters of carboxylic acids having an esterified carboxyl group bound to a carbon atom of a ring other than a six-membered aromatic ring
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- 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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- 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
- C07D493/08—Bridged systems
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- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2601/00—Systems containing only non-condensed rings
- C07C2601/04—Systems containing only non-condensed rings with a four-membered ring
Definitions
- the present invention relates to caged cyclobutanoic acid dianhydride and a method for producing the same, for example, caged cyclobutanoic acid dianhydride that can be a raw material monomer for polyimide for optical materials, and a method for producing the same.
- 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 characteristics, mechanical strength, heat resistance, insulation, and solvent resistance. It is used. Recently, it is also expected to be used as an optical communication material such as an optical waveguide material.
- a particularly important characteristic is high transparency.
- a polyimide precursor is obtained by polycondensation reaction between an alicyclic tetracarboxylic dianhydride and an aromatic diamine, and this precursor is imidized to produce a polyimide.
- Patent Documents 1 and 2 it has already been reported that a highly transparent polyimide with relatively little coloration can be obtained.
- the synthesis of 1,2,3,4-cyclobutanetetracarboxylic acid 1,3: 2,4 monodianhydride, a kind of alicyclic tetracarboxylic dianhydride includes the following schemes: To obtain trans, trans, trans-1,2,3,4-cyclobutanetetracarboxylic acid represented by the formula (D) from the dimethyl fumarate represented by the formula (A). (See Non-Patent Document 1) and 1, 2, 3, 4 represented by the formula (E) from the trans, trans, trans 1, 2, 3, 4 cyclobutanetetracarboxylic acid represented by the formula (D).
- a method of combining 4-cyclobutanetetracarboxylic acid 1,3: 2,4 dianhydride with a method is known.
- reaction time in the first step is very long, 1-5 days.
- Non-Patent Document 2 1, 2, 3, 4-cyclobutanetetracarboxylic acid 1,3: 2,4 monodianhydride represented by the formula (E) of the target product is colored. There is a problem of precipitation as a solid. Furthermore, in Non-Patent Document 2, the chemical structure of the target product is determined only by IR, and a compound having the actual cyclic structure is obtained rather than the absolute structure determination method using single crystal X-rays! / I'm not sure whether or not.
- Patent Document 1 Japanese Patent Application Laid-Open No. 60-188427
- Patent Document 2 JP-A-58-208322
- Non-Patent Document 1 Journal of American Chemical Society, Vol. 83, 272 5-2728 (1961) 196. Am. Chem. Soc., 83, 2725-8 (1961)]
- Non-Patent Document 2 Journal of Organic Chemistry, III, 1018-1021 (1968) ⁇ . Org. Chem., 33 (3), 1018—1021 (1968)]
- the present invention has been made in view of the above circumstances, such as a liquid crystal alignment film, an optical waveguide for optical communication, and the like that have no absorption in the ultraviolet region, have high light transmission properties, and have improved heat resistance.
- An object of the present invention is to provide a cage-like cyclobutanoic acid dianhydride compound that can be a raw material monomer of polyimide for optical materials and a method for producing the same.
- the inventors of the present invention pay attention to a method of increasing the transparency and heat resistance of polyimide by increasing the degree of polymerization by making the main chain of the polyimide structure more linear, and as a raw material monomer, 1, 2, 3, 4 Cage-like cyclobutanoic acid dianhydride compound with excellent linearity, high degree of polymerization, high heat resistance, and symmetry expected to improve solubility in organic solvents by introducing alkyl groups -Cyclobutane tetracarboxylic acid 1,3: 2,4
- 1, 2, 3, 4-cyclobutane tetracarboxylic acid— Established a practical process for 1,2,3,4-cyclobutanetetracarboxylic acid 1,3: 2,4 monoanhydride compounds using 1,2: 3,4 dianhydride compounds as starting materials
- the present invention has been completed.
- the present invention provides the following (1) to (46).
- R 1 and R 2 are each independently a hydrogen atom, a halogen atom, an alkyl group having 1 to 10 carbon atoms, a halogenated alkyl group having 1 to 10 carbon atoms, or a cycloalkyl group having 3 to 8 carbon atoms. Represents a phenol group or a cyan group.
- R 3 represents an alkyl group having 1 to 10 carbon atoms.
- a cis, trans, cis 1, 2, 3, 4-cyclobutanetetracarboxylic acid tetraester compound represented by the formula is isomerized with a base catalyst [4]
- R 1 and R 2 forces 1,2,3,4-cyclobutanetetracarboxylic acid 1,3: 2,4 or 12 of any one of (12) to (14) and (22), which is a methyl group A method for producing an anhydride compound.
- R 5 and R 6 are each independently a halogen atom, an alkyl group having 1 to 10 carbon atoms: an L0 alkyl group, an alkoxy group having 1 to 10 carbon atoms, an alkyl halide group having 1 to 10 carbon atoms, or a carbon number. Represents a cycloalkyl group, a phenyl group or a cyano group of 3 to 8)
- an electronic material such as a protective material or an insulating material in a liquid crystal display element or a semiconductor, which absorbs light in the ultraviolet region, has high light transmittance, and has improved heat resistance, and further has a light guide.
- a cage-like cyclobutanoic acid dianhydride compound that can be used as a raw material monomer for a polyimide for optical materials, which is expected to be used as an optical communication material such as a waveguide, and a practical production method thereof.
- FIG. 1 is a single crystal X-ray chart of cis, trans, cis-tetramethyl 1, 2, 3, 4-cyclobutane tetracarboxylate obtained in Example 1. [0013] FIG.
- FIG. 2 is a single crystal X-ray chart of 1,2,3,4-cyclobutanetetracarboxylic acid 1,3: 2,4-dianhydride obtained in Example 9.
- FIG. 3 is a single-crystal X-ray chart of 1,2 dimethyl 1,1,2,3,4 tetracyclobutane 1,3: 2,4 dianhydride obtained in Example 13.
- n represents normal, “i” represents iso, “s” represents secondary, “t” represents tertiary, and is represented by the above formula [6].
- 2, 3, 4-cyclobutanetetracarboxylic acid 1,3: 2,412 dianhydride compounds (hereinafter abbreviated as caged CBDA compounds) are the following first step, second step, third step and It can be manufactured by a manufacturing method including the fourth step, where the first step can be the first 'step and the third step can be the third' step. Each process is performed in the order of the first process, the second process, the third process, and the fourth process.
- R 1 and R 2 are each independently a hydrogen atom, a halogen atom, an alkyl group having 1 to 10 carbon atoms, a halogenated alkyl group having 1 to 10 carbon atoms, or a cycloalkyl group having 3 to 8 carbon atoms. And represents a phenol group or a cyan group, and each R 3 independently represents an alkyl group having 1 to 10 carbon atoms.
- the alkyl group of LO may be linear or branched, for example, methyl group, ethyl group, n -propyl group, i-propyl group, n-butyl group, i-butyl group, s-butyl group T-butyl group, n-pentyl group, n-hexyl group, n-octyl group, n-decyl group and the like.
- a methyl group having 1 to 5 carbon atoms an ethyl group, an n-propinole group, an i-propinole group, an n-butinole group, an i-butinole group, an s butynole group, a t-butyl group, an n-
- methyl groups, ethyl groups, n-propyl groups and the like, which are alkyl groups having 1 to 3 carbon atoms are more preferable in that the influence of steric hindrance preferred by pentyl groups is small.
- Examples of the halogenated alkyl group having 1 to 10 carbon atoms include a trifluoromethyl group, a pentafluoroethyl group, a heptafluoropropyl group, a perfluorooctyl group, and a perfluorodecyl group.
- trifluoromethyl, pentafluoroethyl, and heptafluoropropyl which are halogenated alkyl groups having 1 to 3 carbon atoms, are preferred because they are less affected by steric hindrance! / ,.
- Examples of the cycloalkyl group having 3 to 8 carbon atoms include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, and a cyclooctyl group.
- cyclopropyl and cyclobutyl which are cycloalkyl groups having 3 to 4 carbon atoms, are preferred because they are less affected by steric hindrance! /!
- alkyl group having 1 to 10 carbon atoms examples include methyl group, ethyl group, n-propyl group, i-propyl group, n butyl group, i butyl group, s butyl group, t butyl group, n-pentyl group, octyl Group, decyl group and the like.
- a methyl group, an ethyl group, and an n-propyl group, which are alkyl groups having 1 to 3 carbon atoms are more preferable because a steric hindrance that is preferred is a til group, a t- butyl group, or an n-pentyl group.
- This process consists of 1, 2, 3, 4-cyclobutanetetracarboxylic acid 1, 2: 3,4 mono-anhydride compound (abbreviated as CBDA compound) and an alcohol compound represented by formula [2].
- CBDA compound 3,4 mono-anhydride compound
- Cis, trans, cis 1, 2, 3, 4-cyclobutanetetracarboxylic acid tetraester compound (abbreviated as cis, trans, cis-TMCB compound) represented by the formula [3] Is a process of manufacturing.
- the raw material CBDA compound represented by the formula [1] can be produced by photodimerization reaction of substituted maleic anhydride.
- a typical production example of the photodimerization reaction is described in JP-A-59-212495.
- Examples of the alcohol compound represented by the formula [2] include alcohols having an alkyl group having 1 to 10 carbon atoms represented by methanol, ethanol, n propanol, i propanol, n-octanol, n-decanol and the like. Kind. Of these, economical methanol is preferred.
- the amount of the alcohol compound used is preferably 4 to 100 mol times, particularly 10 to 50 mol times with respect to the substrate.
- inorganic acids such as hydrochloric acid and sulfuric acid
- solid acids such as heteropolyacid and cation exchange resin
- sulfuric acid is preferred.
- the amount of acid catalyst used is preferably 0.1 to 20% by weight based on the substrate, especially 1%.
- the reaction temperature is usually about the boiling point of the alcoholic compound.
- 00 ° C is preferred, especially 50 to 150 ° C.
- the progress of the reaction can be confirmed by gas chromatography analysis. Operation after completion
- finish of reaction is not specifically limited, For example, the following method is mentioned.
- sulfuric acid as the acid catalyst after confirming disappearance of the raw materials
- return to room temperature after the reaction The precipitated crystals are collected by filtration, washed with the alcohol compound used, and dried to obtain the desired cis, trans, cis-TMCB compound.
- This step is a step of producing a cis, trans, cis-TMCB compound by reacting a CBDA compound with a dialkyl sulfate represented by the formula [7] in the presence of a base catalyst.
- Dialkyl sulfates include dimethyl sulfate, jetyl sulfate, di-n-propyl sulfate, di-i-propyl sulfate, di-n-butyl sulfate, di-i-butyl sulfate, di-s-butyl sulfate, di-n-amyl sulfate, di-n-xyl sulfate, and di-n-butyl.
- dialkyl sulfates having 1 to L0 carbon atoms represented by sulfuric acid di n-octyl sulfate, di n nonyl sulfate, di n-decyl sulfate and the like. Of these, economical dimethyl sulfate is preferred.
- the amount of dialkylsulfuric acid used is preferably 2 to 10 mol times, particularly 2 to 4 mol times relative to the substrate.
- a base catalyst is important.
- the types include alkylamines such as jetylamine, triethylamine, diisopropylamine and di-n-butylamine, and aromatic amines such as pyridine and picoline, with diisopropylamine being particularly preferred.
- the amount of the base catalyst used is preferably 2 to 10 mol times, particularly 2 to 4 mol times relative to the substrate.
- This step can be performed without a solvent, but can also be performed using a solvent.
- an alcohol compound is preferable.
- the kind is preferably an alcohol compound having an alkyl group corresponding to dialkyl sulfate. That is, for example, in the case of dimethyl sulfate, ethanol is suitable in the case of methanol-powered ethyl sulfate.
- the amount of the solvent used is preferably 1 to 20 times by mass, particularly 2 to 10 times by mass with respect to the substrate.
- reaction temperature a temperature approximately equal to the boiling point of the alcoholic compound is usually employed, but 20200 ° C is preferred, and 50 150 ° C is particularly preferred.
- reaction can be confirmed by gas chromatography analysis. Operation after completion
- finish of reaction is not specifically limited, For example, the following method is mentioned. After confirming the disappearance of the raw materials, toluene and dilute hydrochloric acid are added to the residue obtained by concentration to dissolve it, and the organic layer is washed with sodium bicarbonate water and water to obtain the target crude crystal. This crude crystal is dissolved in toluene and n-heptane and recrystallized to obtain a high-purity cis, trans, cis-TMCB compound.
- This step is suitable when R 1 and R 2 are each independently a C 1 to LO alkyl group, for example, a methyl group.
- a cis, trans, cis-TMCB complex is isomerized with a base catalyst, and the trans, trans, trans-1,2,3,4-cyclobutanetetra-force norebon represented by the formula [4] is used.
- the base catalyst which is a process for producing an acid tetraester compound (abbreviated as “all trans” —TMCB compound), includes alkali metal or alkaline earth metal alcoholates, carbonates, hydroxides or acids. Such as things. Examples of the alkali metal include lithium, sodium, and lithium, and examples of the alkaline earth metal include magnesium, calcium, and sodium.
- alcoholates such as sodium methoxide, sodium ethoxide, sodium t-butoxide, potassium methoxide, potassium ethoxide, potassium t-butoxide are preferable, and sodium methoxide and potassium t-butoxide are more preferable.
- t-Butoxide is optimal.
- the amount of the base catalyst is suitably 0.1 mol% to 100 mol% is preferred instrument particularly 0.5 mol% to 20 mol 0/0 relative to the substrate.
- ether compounds such as tetrahydrofuran (THF), 1,4-dioxane, 1,2-dimethoxyethane, diethylene glycol dimethyl ether; methanol, ethanol, n Alcohol compounds such as —propanol, i-propanol, n-butanol, i-butanol and s-butanol are preferred.
- ether compounds are preferably used because they can be used in a low temperature range in addition to promoting the progress of the reaction.
- the amount of solvent used is preferably 1 to 50 times the mass of the substrate, especially 2 to 10 times the mass. It is right.
- the reaction temperature is preferably 100 to 200 ° C force S, and particularly preferably 1 to 100 to 100 ° C.
- ether compounds are used as solvents, it is possible even at temperatures below 20 ° C.
- the progress of the reaction can be confirmed by gas chromatography analysis.
- the operation after completion of the reaction is not particularly limited, and examples thereof include the following methods.
- the residue obtained by concentration is extracted with 1,2-dichloroethane (EDC) and water, acidified with 35% hydrochloric acid, the EDC layer is separated, and concentrated to give white crystals.
- the white crystals are dissolved in methanol and then concentrated to a slight concentration.
- the crystals are collected by filtration, washed with methanol and dried under reduced pressure to obtain a single “all trans” —TMCB compound. This procedure is suitable for R 1 and R 2 force hydrogen atoms.
- Examples of the acid include fatty acids such as formic acid, acetic acid, and propionic acid; and sulfonic acids such as methanesulfonic acid, ethanesulfonic acid, and trifluoromethanesulfonic acid.
- fatty acids such as formic acid, acetic acid, and propionic acid
- sulfonic acids such as methanesulfonic acid, ethanesulfonic acid, and trifluoromethanesulfonic acid.
- formic acid is preferred because the reaction operation is simplified.
- the amount of acid used is preferably at least 4 molar equivalents relative to the substrate.
- the reaction is promoted when the acid ester produced as a by-product is distilled together with a part of the acid, it is preferable that the acid is present in an excess of 10 to LOO molar equivalent.
- benzenesulfonic acid or p-toluenesulfonic acid is added. It is particularly preferable to add P-toluenesulfonic acid.
- the amount of these additives is preferably 0.1 to 10% by weight, particularly 0.5 to 5% by weight, based on the substrate.
- This step is suitable when R 1 and R 2 are hydrogen atoms.
- This step is a step of producing “all trans” —CBTC compound by reacting “all trans” —TMCB compound with an inorganic acid.
- Examples of the inorganic acid include hydrochloric acid, hydrobromic acid, sulfuric acid, phosphoric acid and the like. Among these, the method using hydrochloric acid is simple.
- the inorganic acid is used in an excess amount of 4 to 50 molar equivalents relative to the substrate.
- the reaction is promoted by distilling off the by-produced alcohol, the reaction is preferably carried out while distilling off the by-produced alcohol.
- the reaction temperature is preferably 50 to 200 ° C, particularly preferably 60 to 150 ° C.
- reaction solution was distilled off until the disappearance of the raw material by NMR, azeotropically dehydrated with toluene and dried to dryness, and then recrystallized with ethyl acetate to obtain “all trans” —white crystals of CBTC compound Is obtained.
- This step is suitable when R 1 and R 2 are each independently an alkyl group having 1 to 10 carbon atoms, for example, both are methyl groups.
- This process is a process for producing a caged CBDA compound by reacting an “all trans” —CBTC compound with a dehydrating agent.
- Examples of the dehydrating agent include aliphatic carboxylic acid anhydrides, 1,3-dicyclohexylcarbodiimide (abbreviated as DCC), 2-chlorodiethyl 1,3-dimethylenoylimidazolium chloride (DM) abbreviated as c), etc., and preferably an inexpensive aliphatic carboxylic acid anhydride, particularly acetic anhydride.
- DCC 1,3-dicyclohexylcarbodiimide
- DM 2-chlorodiethyl 1,3-dimethylenoylimidazolium chloride
- c 2-chlorodiethyl 1,3-dimethylenoylimidazolium chloride
- the amount of the dehydrating agent used is 2 to 50 equivalents, preferably 2 to: LO equivalents relative to the substrate.
- the solvent can be used by adding an excess amount of the dehydrating agent itself, but an organic solvent that does not directly participate in the reaction can also be used.
- organic solvents include aromatic hydrocarbons such as toluene and xylene; halogenated hydrocarbons such as 1,2-dichroic ethane and 1,2-dichroic propane; 1,4 dioxane, etc. Is mentioned. Among them, aromatic hydrocarbons are preferably used because a cage-like CBDA complex without coloring is obtained.
- the amount of the organic solvent used is 1 to 20 times by mass, preferably 1 to 10 times by mass with respect to the substrate.
- the reaction temperature is generally around the boiling point of the dehydrating agent or solvent, but is preferably 50 to 200. C, more preferably 60-150. C.
- reaction time varies depending on the reaction temperature, it cannot be defined unconditionally, but in practice, it is 1 to 20 hours, more preferably 2 to LO time.
- the dehydrating agent and, if necessary, the solvent used are distilled off to obtain the target caged CBDA compound.
- the obtained compound has sufficient purity as it is, but may be purified by a recrystallization method if necessary.
- the reaction mixture is subjected to the dehydration reaction in the fourth step, and formic acid and acetic acid produced as a by-product (when acetic anhydride is used as the dehydrating agent)
- the desired cage-like CBDA compound can be obtained by increasing the conversion rate while distilling off the organic solvent used together with necessity (3rd step 4th step one-pot method). ).
- reaction of each process mentioned above can be performed by a notch type or a flow type, and can be performed under normal pressure or under pressure.
- the present invention also provides a 1,2,3,4-cyclobutanetetracarboxylic acid 1,3: 2,4 monodianhydride compound represented by the formula [8].
- R 5 and R 6 are each independently a halogen atom, an alkyl group having 1 to 10 carbon atoms: an L0 alkyl group, an alkoxy group having 1 to 10 carbon atoms, a halogenated alkyl group having 1 to 10 carbon atoms, or 3 carbon atoms. Represents a cycloalkyl group, a phenol group or a cyano group of ⁇ 8)
- R 5 and R 6 include fluorine atom, chlorine atom, bromine atom, halogen atom of iodine atom; carbon number such as methyl group, ethyl group, propyl group, octyl group, decyl group, etc. 1-10 alkyl groups; halogens having 1-10 carbon atoms such as trifluoromethoxy group, pentafluoroethoxy group, heptafluoropropoxy group, perfluorooctyloxy group, perfluorodecyloxy group, etc.
- An alkyl group a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group and the like, a cycloalkyl group having 3 to 8 carbon atoms; a phenyl group; a cyano group, and the like.
- the present invention provides a cis, trans, cis 1, 2, 3, 4-cyclobutanetetracarboxylic acid represented by the formula [9] as an intermediate for producing the compound represented by the formula [8].
- Trans 1, 2, 3, 4 Provides a cyclobutane tetracarboxylic acid compound.
- Measuring instrument Automatic melting point measuring device, FP62 (METTLER TOLEDO)
- DIP2030K manufactured by Mac Science
- This crystal was confirmed to be cis, trans, cis-tetramethyl-1,2,3,4-cyclobutanetetracarboxylate by the following single crystal X-ray analysis. This structure was also supported by MASS, 'H-NMR and 13 c-NMR data.
- the separated EDC layer was concentrated to obtain 2.7 g of white crystals. Further, the white crystals were dissolved in methanol, concentrated slightly and vigorously cooled to precipitate crystals. The crystals were collected by filtration, washed with methanol and dried under reduced pressure, and gas chromatography (GC) gave 2.Og of white crystals with a single peak.
- GC gas chromatography
- Example 2 In the reaction of Example 2, a cis, trans, cis-tetramethyl 1, 2, 3, 4-cyclobutanetetracarboxylate 0.864 g (3.Ommol) was placed in a 50 ⁇ Pyrex (registered trademark) glass four-neck reaction flask. ), 14.4 g of methanol, and the types and Table 1 shows the results of gas chromatography using the reaction temperature and time shown in Table 1.
- This crystal was confirmed to be 1, 2, 3, 4 cyclobutanetetracarboxylic acid 1, 3: 2, 4 monodianhydride by MASS, —NMR and 13 C—NMR analysis.
- the reaction mixture was cooled to 20 ° C., and the precipitated crystals were collected by filtration, washed with toluene and dried under reduced pressure at a temperature of 40 ° C. or less to obtain 10.9 g of white crystals (yield 86.3%).
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Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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KR1020077008265A KR101286228B1 (ko) | 2004-10-20 | 2005-10-18 | 케이지 형상 시클로부탄산 2무수물 및 그 제조법 |
CN2005800360415A CN101044108B (zh) | 2004-10-20 | 2005-10-18 | 笼状环丁烷羧酸二酐及其制备方法 |
US11/665,024 US7872148B2 (en) | 2004-10-20 | 2005-10-18 | Cage-shaped cyclobutanoic dianhydrides and process for production thereof |
EP05795540A EP1813592B1 (en) | 2004-10-20 | 2005-10-18 | Cage-shaped cyclobutanoic dianhydrides and process for production thereof |
JP2006542980A JP5326211B2 (ja) | 2004-10-20 | 2005-10-18 | ケージ状シクロブタン酸二無水物の製造法 |
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JP2005-085162 | 2005-03-24 | ||
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CN (1) | CN101044108B (ja) |
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Cited By (4)
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WO2006104038A1 (ja) * | 2005-03-29 | 2006-10-05 | Nissan Chemical Industries, Ltd. | ポリアミック酸、ポリイミド及びその製造方法 |
WO2010116990A1 (ja) * | 2009-04-10 | 2010-10-14 | 日産化学工業株式会社 | ケージ状シクロペンタン酸二無水物化合物、その製造法およびポリイミド |
WO2015108170A1 (ja) * | 2014-01-17 | 2015-07-23 | 日産化学工業株式会社 | シクロブタンテトラカルボン酸及びその無水物の製造方法 |
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US8975365B2 (en) | 2009-04-10 | 2015-03-10 | Nissan Chemical Industries, Ltd. | Cage-shaped cyclopentanoic dianhydride, method for production thereof, and polyimide |
JPWO2010116990A1 (ja) * | 2009-04-10 | 2012-10-18 | 日産化学工業株式会社 | ケージ状シクロペンタン酸二無水物化合物、その製造法およびポリイミド |
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TWI555750B (zh) * | 2009-04-10 | 2016-11-01 | Nissan Chemical Ind Ltd | Cage cyclopentanoic acid dianhydride compounds, processes for their manufacture and polyimides |
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Also Published As
Publication number | Publication date |
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JP5326211B2 (ja) | 2013-10-30 |
KR20070067132A (ko) | 2007-06-27 |
KR101286228B1 (ko) | 2013-07-15 |
CN101044108B (zh) | 2012-05-23 |
US20090012318A1 (en) | 2009-01-08 |
JPWO2006043519A1 (ja) | 2008-05-22 |
TWI368610B (ja) | 2012-07-21 |
EP1813592B1 (en) | 2012-10-10 |
EP1813592A1 (en) | 2007-08-01 |
TW200621705A (en) | 2006-07-01 |
CN101044108A (zh) | 2007-09-26 |
US7872148B2 (en) | 2011-01-18 |
EP1813592A4 (en) | 2009-11-11 |
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