JP2015013830A - Diamine compound and method of producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sulfonic acid ester group-containing diamine compound that is white and is hard to be colored and a method of producing the same.SOLUTION: This invention relates to 4,4'-bis(4-aminobenzenesulfonic acid) biphenyl represented by the following formula (1).

Description

  The present invention relates to an industrially useful diamine compound containing a sulfonic acid ester group and a method for producing the same.

  Diamine compounds are widely used in the fields of organic chemistry and polymer chemistry, and are useful in a wide range of industrial applications such as fine chemicals, medical and agricultural chemical raw materials and resin raw materials, and electronic information materials and optical materials. A compound. In recent years, research on materials using a diamine compound having an ester group as a raw material has been actively conducted, for example, a polyimide copolymer having improved solubility in a solvent can be obtained (Patent Document 1), and excellent in various properties such as heat resistance, A polyimide copolymer having high mechanical strength and a low coefficient of linear expansion and excellent thermal dimensional stability can be obtained (Patent Document 2), and a heat-resistant insulating material having low thermal expansion and low hygroscopic expansion can be obtained. (Nonpatent literature 1) etc. are reported. Therefore, the performance required for these diamine compounds has been diversified and advanced, and materials having excellent transparency, for example, diamines containing sulfonic acid ester groups that are white and difficult to color are desired. Yes.

  Conventional diamine compounds are often colored in general, are easily colored by air oxidation, and have disadvantages such as coloring during production and progressing during storage, and transparency is required. There were drawbacks such as restrictions on the materials used.

US Pat. No. 4,317,902 JP-A-7-133349 Edited by Japan Polyimide / Aromatic Polymers Research Group, “New Revised Polyimide: Basics and Applications”, NTS Publishing Co., Ltd., August 25, 2010, p. 287-304

  An object of the present invention is to provide a diamine compound containing a sulfonic acid ester group which is white and hardly colored, and a method for producing the diamine compound.

  As a result of intensive studies, the present inventors have found a novel diamine compound that is white and difficult to color by containing a sulfonic acid ester group, and a method for producing the same.

  That is, the diamine compound of the present invention has the following formula (1)

It is 4,4'-bis (4-aminobenzenesulfonic acid) biphenyl shown by these.

  The method for producing a diamine compound of the present invention includes 4-acetamidobenzenesulfonic acid chloride represented by the following formula (2),

Obtained by esterifying 4,4'-biphenol represented by the following formula (3) with a base,

Obtained by deacetylating 4,4'-bis (4-acetamidobenzenesulfonic acid) biphenyl represented by the following formula (4):

This is a method for producing 4,4'-bis (4-aminobenzenesulfonic acid) biphenyl represented by the following formula (1).

  Although the novel diamine compound of the present invention, ie, 4,4′-bis (4-aminobenzenesulfonic acid) biphenyl, is a diamine compound, it has a white color due to the introduction of a rigid sulfonic acid ester group in the compound. It is promising as a raw material for polyimides, polyamides, epoxy resins and the like that are required to be transparent. In addition, since this compound contains an ester group, it has excellent solubility in a solvent, improved heat resistance, high mechanical strength, low linear expansion, low thermal expansion, low hygroscopic expansion, and the like. It is promising as a raw material for functional polyimide materials such as base film materials for flexible circuit boards, photosensitive heat-resistant polymers, and liquid crystal alignment films.

1 is a hydrogen nuclear magnetic resonance (hereinafter referred to as “ ¹ H-NMR”) spectrum chart of 4,4′-bis (4-aminobenzenesulfonic acid) biphenyl obtained in Example 1. FIG. 2 is an infrared spectroscopy (hereinafter referred to as “IR”) spectrum chart of 4,4′-bis (4-aminobenzenesulfonic acid) biphenyl obtained in Example 1. FIG.

  Below, it describes in detail about the diamine compound of this invention, and the manufacturing method of the diamine compound.

  The present invention is 4,4'-bis (4-aminobenzenesulfonic acid) biphenyl represented by the following formula (1).

  4,4'-bis (4-aminobenzenesulfonic acid) biphenyl represented by the above formula (1) is a compound that is white and hardly colored. For example, even when stored in an air atmosphere at 40 ° C. for 7 days, there is almost no change in color and no coloring is observed.

  When producing the compound represented by the above formula (1), first, the following formula (2)

4-acetamidobenzenesulfonic acid chloride represented by the following formula (3)

To produce 4,4′-bis (4-acetamidobenzenesulfonic acid) biphenyl represented by the following formula (4) as an intermediate by esterification with 4,4′-biphenol represented by the formula: I can do it.

  The reaction ratio of 4-acetamidobenzenesulfonic acid chloride represented by the formula (2) and 4,4′-biphenol represented by the formula (3) is 4 with respect to 1 mol of 4-acetamidobenzenesulfonic acid chloride. The amount of 4'-biphenol is preferably 0.3 to 1.0 mol, more preferably 0.4 to 0.6 mol. It is expected that the yield reduction due to unreachable reaction can be prevented by setting the 4,4′-biphenol to 0.3 mol or more, and by reducing the amount to 1.0 mol or less, 4,4′-biphenol can be obtained from the reaction product. This is preferable because it requires less energy to remove biphenol and less waste, which is economical.

  In the esterification reaction, 4-acetamidobenzenesulfonic acid chloride represented by the formula (2) is reacted with 4,4′-biphenol represented by the formula (3) in the presence of a base.

  Examples of the base preferably used in the esterification reaction include alkali metal hydride, alkaline earth metal hydride, alkali metal hydroxide, alkaline earth metal hydroxide, alkali metal carbonate, alkaline earth metal carbonate. Examples thereof include salts, alkali metal hydrogen carbonates, alkali metal alkoxides, alkaline earth metal alkoxides, alkali metal fluorides, and amines.

  Examples of the alkali metal hydride include lithium hydride, sodium hydride, potassium hydride and the like.

  Examples of the alkaline earth metal hydride include beryllium hydride, magnesium hydride, calcium hydride and the like.

  Examples of the alkali metal hydroxide include lithium hydroxide, sodium hydroxide, potassium hydroxide and the like.

  Examples of the alkaline earth metal hydroxide include beryllium hydroxide, magnesium hydroxide, calcium hydroxide and the like.

  Examples of the alkali metal carbonate include lithium carbonate, sodium carbonate, potassium carbonate and the like.

  Examples of the alkaline earth metal carbonate include beryllium carbonate, magnesium carbonate, and calcium carbonate.

  Examples of the alkali metal hydrogen carbonate include sodium hydrogen carbonate, potassium hydrogen carbonate, lithium hydrogen carbonate and the like.

  Examples of the alkali metal alkoxide include sodium methoxide, sodium ethoxide, sodium t-butoxide, potassium methoxide, potassium ethoxide, potassium t-butoxide and the like.

  Examples of the alkaline earth metal alkoxide include magnesium diethoxide and magnesium dimethoxide.

  Examples of the alkali metal fluoride include sodium fluoride, potassium fluoride, cesium fluoride and the like.

  As amines, tertiary amines such as trimethylamine, triethylamine, tributylamine, N, N-dimethylaniline, dimethylbenzylamine, N, N, N ′, N′-tetramethyl-1,8-naphthalenediamine, pyridine, pyrrole , Heteroaromatic amines such as uracil, collidine and lutidine, 1,8-diaza-bicyclo [5.4.0] -7-undecene, 1,5-diaza-bicyclo [4.3.0] -5-nonene And cyclic amidines.

  These bases may be used alone or in combination of two or more. Of these bases, triethylamine and pyridine are particularly preferable because they are liquid and easy to handle, and are easy to remove because of their low boiling point.

  The amount of the base used is preferably 1.0 to 3.0 mol times, more preferably 1.0 to 1.5 mol times the amount of 4-acetamidobenzenesulfonic acid chloride. By reducing the amount of the base to 1.0 mol times or more, it is possible to prevent a decrease in yield due to failure to achieve the reaction. Since it decreases, it is preferable.

  As a solvent preferably used in the esterification reaction, for example, a sulfoxide compound, a sulfolane compound, an amide compound, a nitrile compound, an ether compound, a hydrocarbon compound, a ketone compound, an ester compound and the like can be preferably used.

  Examples of the sulfoxide compound include dimethyl sulfoxide and diethyl sulfoxide.

  Examples of the sulfolane compound include sulfolane and methyl sulfolane.

  Examples of amide compounds include N, N-dimethylacetamide, N, N-diethylacetamide, N, N-dimethylformamide, 2-pyrrolidone, N-methyl-2-pyrrolidone, hexamethylphosphoric triamide, 1,3-dimethyl. -2-imidazolinodin etc. are mentioned.

  Examples of nitrile compounds include acetonitrile, propionitrile, butyronitrile, isobutyronitrile, benzonitrile and the like.

  Examples of ether compounds include monoglyme, diglyme, triglyme, tetraglyme, diethyl ether, diisopropyl ether, di-n-butyl ether, t-butyl methyl ether, cyclopentyl methyl ether, tetrahydrofuran (THF), tetrahydropyran, 1,4-dioxane, 1,3-dioxolane, anisole, morpholine and the like can be mentioned.

  Examples of the hydrocarbon compound include toluene, xylene, mesitylene, n-hexane, n-heptane, cyclohexane, methylcyclohexane, and the like.

  Examples of the ketone compound include acetone, methyl ethyl ketone, methyl isobutyl ketone, 2-pentanone, 3-pentanone, 2-hexanone, 2-heptanone, 4-heptanone, diisobutyl ketone, cyclohexanone, methylcyclohexanone, and isophorone.

Examples of ester compounds include methyl acetate, ethyl acetate, propyl acetate, isopropyl acetate, butyl acetate, isobutyl acetate, pentyl acetate, isopentyl acetate, 3-methoxybutyl acetate, 2-ethylbutyl acetate, 2-ethylhexyl acetate, acetic acid. Cyclohexyl, methyl propionate, ethyl propionate, butyl propionate, methyl butyrate, ethyl butyrate, butyl butyrate, γ-butyrolactone, etc.
Among these, acetonitrile, tetrahydrofuran, toluene, acetone, and ethyl acetate are preferable because of their low boiling point and easy removal.

  An esterification solvent may be used independently and may be used in mixture of 2 or more types.

  The amount of the esterification solvent used is usually in the range of 0.1 to 20 times the weight of 4-acetamidobenzenesulfonic acid chloride.

  The esterification reaction is preferably carried out in a nitrogen atmosphere. By carrying out in a nitrogen atmosphere, purity deterioration can be suppressed by preventing oxygen from entering the system.

  The reaction temperature for the esterification reaction is usually preferably 0 to 150 ° C, more preferably 0 to 70 ° C. When the temperature is 0 ° C. or higher, the reaction proceeds rapidly, and when the temperature is 150 ° C. or lower, side reactions can be suppressed and yield reduction can be prevented.

  The reaction time of the esterification reaction is usually in the range of 0.5 to 20 hours.

  After completion of the esterification reaction, crystals are precipitated by adding a crystallization solvent to the reaction mixture, and an intermediate compound is obtained by isolating the crystals. The obtained intermediate may be recrystallized.

  As a crystallization solvent preferably used in the esterification reaction, for example, water, an alcohol compound, or the like can be suitably used.

  Examples of alcohol compounds include methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, isobutyl alcohol, tert-butyl alcohol, methoxyethanol, ethoxyethanol, and 1-methoxy-2-propanol. Can be mentioned.

  These crystallization solvents may be used alone or in combination of two or more. Of these crystallization solvents, water, methanol, ethanol, and 2-propanol are particularly preferable because they are available at low cost.

  Moreover, you may use for the following process, without isolating an intermediate body after completion | finish of esterification reaction.

  Next, 4,4′-bis (4-aminobenzene) represented by the following formula (1) is obtained by deacetylating the 4,4′-bis (4-acetamidobenzenesulfonic acid) biphenyl obtained above. Sulfonic acid) biphenyl can be produced.

  As a deacetylation method, a method of hydrolysis using an acid or alkali is generally known. However, when an acid or alkali is used, in the case of a compound containing an ester group, there is a drawback that hydrolysis of the ester group also proceeds. In the present invention, by introducing a rigid sulfonic acid ester group, it becomes a compound which is stable against acid, and hydrolysis of the target sulfonic acid ester group can be suppressed. As a result, in the present invention, deacetylation using an acid is most preferred. By using an acid, hydrolysis of the sulfonic acid ester group is suppressed, and the target product can be obtained in high yield.

  These acids may be used alone or in combination of two or more. Of these acids, hydrochloric acid and sulfuric acid are particularly preferred from the viewpoint of easy post-treatment.

  The amount of the acid used is preferably 1.0 to 20.0 mol times, more preferably 2.0 to 10.0 mol times based on 4,4′-bis (4-acetamidobenzenesulfonic acid) biphenyl. A good amount. By reducing the amount of the base to 2.0 mol times or more, a decrease in yield due to unreachable reaction can be prevented, and by setting the amount to 10.0 mol times or less, energy required for acid removal is reduced, and waste is also reduced. Since it decreases, it is preferable.

  As a solvent preferably used for deacetylation, for example, an alcohol compound, an ether compound, a hydrocarbon compound, a nitrile compound, or the like can be suitably used.

  Examples of alcohol compounds include methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, isobutyl alcohol, tert-butyl alcohol, methoxyethanol, ethoxyethanol, and 1-methoxy-2-propanol. Can be mentioned.

  Examples of the ether compound include glyme, diglyme, tetrahydrofuran, dioxane and the like.

  Examples of the hydrocarbon compound include toluene, xylene, mesitylene, hexane, cyclohexane, heptane, methylcyclohexane and the like.

  Examples of nitrile compounds include acetonitrile, propionitrile, butyronitrile, isobutyronitrile, benzonitrile and the like.

  Among these, tetrahydrofuran, 2-propanol, and toluene are preferable because of their low boiling point and easy removal.

  The solvent for the deacetylation reaction may be used alone or in combination of two or more.

  The amount of the solvent used is usually in the range of 0.1 to 20 times the weight of 4,4'-bis (4-acetamidobenzenesulfonic acid) biphenyl.

  The deacetylation reaction is preferably performed in a nitrogen atmosphere. By carrying out in a nitrogen atmosphere, purity deterioration can be suppressed by preventing oxygen from entering the system.

  The reaction temperature for deacetylation is usually preferably 0 to 150 ° C, more preferably 50 to 120 ° C. When the temperature is 50 ° C. or higher, the reaction proceeds rapidly, and when the temperature is 120 ° C. or lower, side reactions can be suppressed and yield reduction can be prevented.

The reaction time of the deacetylation reaction is usually in the range of 0.5 to 20 hours.
After the deacetylation reaction, the reaction solution is neutralized, and then a crystal is precipitated by adding a crystallization solvent to the neutralization solution. By isolating the crystals, 4,4 represented by the formula (1) is obtained. '-Bis (4-aminobenzenesulfonic acid) biphenyl is obtained. The obtained compound may be recrystallized.

  As a crystallization solvent preferably used for the deacetylation reaction, for example, water, alcohol compounds, hydrocarbon compounds and the like can be suitably used.

  Examples of alcohol compounds include methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, isobutyl alcohol, tert-butyl alcohol, methoxyethanol, ethoxyethanol, 1-methoxy-2-propanol, and the like. Is mentioned.

  Examples of the hydrocarbon compound include toluene, xylene, mesitylene, n-hexane, n-heptane, cyclohexane, methylcyclohexane, and the like.

  These crystallization solvents may be used alone or in combination of two or more. Of these crystallization solvents, water, methanol, ethanol, 2-propanol, and toluene are particularly preferable for improving the purity of the present compound.

  The diamine compound represented by the formula (1) obtained as described above is a white compound despite the fact that it is a diamine compound by introducing a rigid sulfonic acid ester group into the compound, and is based on air. Less susceptible to oxidation and no coloration during manufacturing. Moreover, coloring at the time of storage can be suppressed.

  This diamine compound is promising as a raw material for polyimide, polyamide, epoxy resin, and the like that require transparency. In addition, since it contains an ester group, it has excellent functionality such as improved solubility in solvents, improved heat resistance, high mechanical strength, low linear expansion, low thermal expansion, and low hygroscopic expansion. It is promising as a raw material for polyimide raw materials, such as base film materials for flexible circuit boards, photosensitive heat-resistant polymers, and liquid crystal alignment films.

  Hereinafter, specific examples will be described.

In Example 1, the content of 4,4′-bis (4-aminobenzenesulfonic acid) biphenyl in the diamine compound, that is, the chemical purity of 4,4′-bis (4-aminobenzenesulfonic acid) biphenyl is high speed. This is a liquid chromatography method (hereinafter abbreviated as “HPLC”) analyzed under the following analysis conditions (HPLC area%).
Column: YMC-Pack ODS-AM303 4.6φ × 250mm
-Column temperature: 40 ° C
・ Mobile phase:
A: 0.05% (v / v) phosphoric acid aqueous solution B: Acetonitrile (gradient) 0 min. A: B = 50: 50
5 min. A: B = 50: 50
30 min. A: B = 10: 90
・ Flow rate: 1 ml / min
・ Injection volume: 0.5 μl
・ Detection: Ultraviolet (UV) detection, wavelength 254nm
Analysis time: 30 minutes Preparation of analysis sample: 0.05 g of sample was weighed and dissolved in 25 ml of acetonitrile.

  The chemical purity of the intermediate 4,4'-bis (4-acetamidobenzenesulfonic acid) biphenyl was also analyzed under the above HPLC analysis conditions.

Example 1
In a 500 ml four-necked flask equipped with a thermometer, condenser and stirrer, 12.1 g (0.065 mol) of 4,4′-biphenol, 31.6 g (0.135 mol) of 4-acetamidobenzenesulfonic acid chloride, tetrahydrofuran 100 g was charged and the system was purged with nitrogen. To this, 14.5 g (0.143 mol) of triethylamine was added dropwise at around 40 ° C. This mixture was stirred at 50 ° C. for 3 hours to carry out an esterification reaction. After the reaction was completed, water and 2-propanol were added, and the precipitated crystals were isolated. The resulting intermediate had an HPLC purity of 99.3%.

  To the obtained intermediate, 30 g of tetrahydrofuran, 75 g of 2-propanol and 40.7 g (0.390 mol) of 35% hydrochloric acid were added, followed by stirring at 75 ° C. for 5 hours for deacetylation reaction. After the reaction was completed, the slurry was neutralized with 31.6 g (0.520 mol) of 28% aqueous ammonia to obtain a slurry containing a diamine compound. The diamine compound in the obtained slurry had an HPLC purity of 96.0%. The hydrolysis of the sulfonic acid ester group during deacetylation was 0.5%.

  Water and 2-propanol were added to the resulting slurry, cooled to 5 ° C., filtered and dried to obtain 28.0 g of a white crystalline diamine compound. The obtained diamine compound had an HPLC purity of 97.9% and a yield of 85.0%.

FIG. 1 shows a hydrogen nuclear magnetic resonance ( ¹ H-NMR) spectrum chart of the diamine compound obtained in Example 1, and FIG. 2 shows an infrared (IR) absorption spectrum chart. ¹ H-NMR was performed under the measurement conditions described in the figure.

  Based on the above results, the obtained diamine compound was identified as 4,4'-bis (4-aminobenzenesulfonic acid) biphenyl.

(Reference Example 1)
In Example 1, except that 32.5 g (0.390 mol) of 48% sodium hydroxide aqueous solution was used in place of 35% hydrochloric acid during the deacetylation reaction, and the reaction was performed at 75 ° C. for 5 hours, Example 1 When carried out in the same manner, hydrolysis of the sulfonate group at the time of deacetylation was 99% or more, and the HPLC purity of the target product was 1% or less, and the target product was hardly obtained.

(Reference Example 2)
When the diamine compound obtained in Example 1 was stored at 40 ° C. for 7 days in an air atmosphere, there was almost no change in color and no coloring was observed. For comparison, when 4,4′-diaminodiphenyl ether was stored under the same conditions, the color changed from an initial ocher color to a light brown color after 7 days of storage, and coloring was observed.

Claims (3)

4,4′-bis (4-aminobenzenesulfonic acid) biphenyl represented by the following formula (1).

4-acetamidobenzenesulfonic acid chloride represented by the following formula (2);

Obtained by reacting 4,4′-biphenol represented by the following formula (3) under a base,

Obtained by deacetylating 4,4′-bis (4-acetamidobenzenesulfonic acid) biphenyl represented by the following formula (4),

A method for producing 4,4′-bis (4-aminobenzenesulfonic acid) biphenyl represented by the following formula (1):

The 4,4′-bis (4-acetamidobenzenesulfonic acid) biphenyl of 4,4′-bis (4-aminobenzenesulfonic acid) biphenyl according to claim 2 is deacetylated using an inorganic acid. Production method.

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