JP3732539B2 - Novel polyphenol and method for producing the same - Google Patents

Novel polyphenol and method for producing the same Download PDF

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Publication number
JP3732539B2
JP3732539B2 JP26525994A JP26525994A JP3732539B2 JP 3732539 B2 JP3732539 B2 JP 3732539B2 JP 26525994 A JP26525994 A JP 26525994A JP 26525994 A JP26525994 A JP 26525994A JP 3732539 B2 JP3732539 B2 JP 3732539B2
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Prior art keywords
polyphenol
reaction
trihydroxy
bis
present
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JPH08127552A (en
Inventor
潔 熊木
義昭 岩崎
明子 藤澤
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Honshu Chemical Industry Co Ltd
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Honshu Chemical Industry Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/50Improvements relating to the production of bulk chemicals
    • Y02P20/52Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts

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  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
  • Phenolic Resins Or Amino Resins (AREA)

Description

【0001】
【産業上の利用分野】
本発明は、新規なポリフェノール及びその製造方法に関する。詳しくは、本発明は、少なくとも2、3及び4位にそれぞれ水酸基を有するベンゾフェノン化合物の2分子が互いに5位においてアルキリデン基にて結合された新規なポリフェノール及びその製造方法に関する。
【0002】
このようなポリフェノールは、電気・電子部品の製造において、封止剤、接着剤、積層材料、電気絶縁材料等として用いられるエポキシ樹脂の原料や、又はエポキシ樹脂の硬化剤として、また、不飽和ポリエステル等の樹脂原料として有用である。更に、耐熱性にすぐれた紫外線吸収剤としても有用であるほか、感熱記録の用途に好適な顕色剤や退色防止剤等にも用いることができる。
【0003】
【従来の技術】
本発明による少なくとも2、3及び4位にそれぞれ水酸基を有するベンゾフェノン化合物の2分子が相互に5位においてアルキリデン基にて結合されたポリフェノールは新規な化合物であり、従来、知られていない。
【0004】
【発明が解決しようとする課題】
本発明は、そのような新規なポリフェノール及びその製造方法を提供することを目的とする。
【0005】
【発明を解決するための手段】
本発明によるよるポリフェノールは、一般式(I)
【0006】
【化4】

Figure 0003732539
【0007】
(式中、Rは水素又は炭素数1〜3のアルキル基を示し、nは0、1又は2を示す。)
で表わされる。
【0008】
従って、本発明によるかかるポリフェノールの好ましい具体例としては、例えば、
(1) ビス−(2,3,4−トリヒドロキシ−5−ベンゾイルフェニル)メタン、
(2) ビス−〔2,3,4−トリヒドロキシ−5−(4−ヒドロキシベンゾイル)フェニル〕メタン、
(3) ビス−〔2,3,4−トリヒドロキシ−5−(3−ヒドロキシベンゾイル)フェニル〕メタン、
(4) ビス−〔2,3,4−トリヒドロキシ−5−(2−ヒドロキシベンゾイル)フェニル〕メタン、
(5) ビス−〔2,3,4−トリヒドロキシ−5−(2,4−ジヒドロキシベンゾイル)フェニル〕メタン、
(6) ビス−〔2,3,4−トリヒドロキシ−5−(3,4−ジヒドロキシベンゾイル)フェニル〕メタン、
(7) ビス−〔2,3,4−トリヒドロキシ−5−(2,3−ジヒドロキシベンゾイル)フェニル〕メタン
等を挙げることができる。
【0009】
このようなポリフェノールは、本発明に従って、酸性触媒の存在下、一般式(II)
R−CHO
(式中、Rは水素又は炭素数1〜3のアルキル基を示す。)
で表わされるアルデヒドと一般式(III)
【0010】
【化5】
Figure 0003732539
【0011】
(式中、nは0、1又は2を示す。)
で表わされるベンゾフェノン化合物とを反応させることによって得ることができる。
【0012】
以下に、本発明によるポリフェノールの製造方法について詳細に説明する。
本発明によるポリフェノールの製造において用いるアルデヒドは、前記一般式(II)で表わされるものであって、ホルムアルデヒド、アセトアルデヒド、プロピオンアルデヒド、ブチルアルデヒド又はイソブチルアルデヒドである。これらのなかでは、ホルムアルデヒド又はアセトアルデヒドが好ましく、特に、ホルムアルデヒドが好ましい。ホルムアルデヒドは、市販のホルムアルデヒド水溶液をそのまま利用できるほか、水存在下において、ホルムアルデヒドと同様に作用するパラホルムアルデヒドやトリオキサンも用いることができる。
【0013】
アルデヒドとして、例えば、ホルムアルデヒドを用いるときは、ベンゾフェノン化合物の2分子が相互に5位においてメチレン基にて結合されたポリフェノールを得ることができ、また、アセトアルデヒドを用いるときは、ベンゾフェノン化合物の2分子が相互に5位においてエチリデン基にて結合されたポリフェノールを得ることができる。
【0014】
本発明によるポリフェノールの製造において用いるベンゾフェノン化合物は、前記一般式(III)で表わされ、具体例として、例えば、2,3,4−トリヒドロキシベンゾフェノン、2,3,4,4'−テトラヒドロキベンゾフェノン、2,3,4,2',4' −ペンタヒドロキベンゾフェノン等を挙げることができる。
【0015】
本発明によるポリフェノールの製造において用いる酸性触媒としては、塩酸、臭化水素酸、硫酸、リン酸等の無機酸、ジメチル硫酸、メタンスルホン酸、トリフロロメタンスルホン酸、p−トルエンスルホン酸、トリクロロ酢酸、蓚酸、ギ酸等の有機酸、陽イオン交換樹脂等の固体酸を挙げることができる。これらのなかでは、特に、塩酸又はp−トルエンスルホン酸が好ましく用いられる。
【0016】
これら酸性触媒の使用量は、通常、用いるアルデヒド及びベンゾフェノン化合物の合計重量に対して、0.001〜5重量%の範囲であり、特に、0.01〜0.5重量%の範囲が好ましい。
【0017】
本発明によるポリフェノールの製造において、アルデヒドは、通常、ベンゾフェノン化合物1モル部に対して、0.25〜0.55モル部の範囲で用いられ、好ましくは、0.35モル部以上、特に好ましくは0.45モル部以上で、0.50モル部以下の範囲で用いられる。用いるアルデヒドの量がベンゾフェノン化合物1モル部に対して0.25モル部よりも少ないときは、未反応のベンゾフェノン化合物が比較的多量に残存し、目的とするポリフェノールの収量が低いうえに、反応終了後の反応生成物の精製処理が煩雑である。他方、ベンゾフェノン化合物1モル部に対して、用いるアルデヒドの量が0.55モル部を越えるときは、高分子量物が多量に副生し、本発明の目的とするポリフェノールの収率が低下するうえに、反応終了後の反応生成物の精製処理が煩雑となる。
【0018】
本発明によるポリフェノールの製造に際して、上記反応は、無溶媒下においても行なうことができるが、一般的には、反応は、有機溶媒中で行なうことが好ましい。そのような有機溶媒として、例えば、テトラヒドロフラン、ジオキサン、ジオキソラン等の環状エーテル類、又はこれらの環状エーテル類とトルエン、ベンゼン等の芳香族炭化水素溶媒との混合溶媒を挙げることができる。更に、酢酸等の有機酸も有機溶媒の一部又は全部として用いることができる。
これらの有機溶媒を用いる場合、ベンゾフェノン化合物に対して、0.5〜20重量倍、好ましくは、1〜10重量倍の範囲で用いられ、特に好ましくは、2〜8重量倍の範囲で用いられる。
【0019】
本発明において、上記反応の温度は、通常、室温乃至100℃の範囲であり、好ましくは、50〜95℃の範囲であり、最も好ましくは、70〜90℃の範囲である。反応温度が室温より低いときは、反応速度が極度に遅くなり、他方、反応温度を水の沸点である100℃よりも高くすると、特に、アルデヒドとして、ホルマリンを用いた場合に、それを反応系中にとどめるために加圧系にする必要があり、装置が煩雑になる。他方、反応時間は、特に限定されるものではないが、通常、1〜48時間程度であり、好ましくは、3〜24時間程度である。
【0020】
反応終了後、反応系を冷却すると、反応生成物である前記一般式(I)で表わされる本発明によるポリフェノールが反応系中に析出するので、それを濾過によって回収し、必要に応じて、得られた結晶を適宜の有機溶媒で洗浄した後、十分に水洗し、乾燥すればよい。ここに、上記結晶の洗浄のための有機溶媒としては、反応溶媒として用いたものと同じ有機溶媒を好ましく用いることができる。
【0021】
更に、得られた結晶の純度を高める必要がある場合には、テトラヒドロフラン、ジオキサン、ジオキソラン等の環状エーテル類中に加温下に結晶を溶解させ、この後、冷却し、再結晶することによって、本発明によるポリフェノールの精製品を得ることができる。
【0022】
【発明の効果】
以上のように、本発明によれば、少なくとも2、3及び4位にそれぞれ水酸基を有するベンゾフェノン化合物の2分子が相互に5位においてアルキリデン基、好ましくはメチレン基にて結合された新規なポリフェノールが提供される。
このような本発明によるポリフェノールは、従来のポリフェノールに比べて、分子が有する水酸基の数が多く、そのうえに、電子吸引性のカルボニル基を有するので、上記水酸基の反応性が高く、しかも、紫外線吸収性や耐熱性等の機能性にもすぐれている。
【0023】
従って、本発明によるポリフェノールは、例えば、エポキシ樹脂の原料や、又はその硬化剤として用いることによって、架橋密度が高く、耐熱性にもすぐれた硬化成形物を得ることができる。また、本発明によるポリフェノールは、耐候安定性を目的とした樹脂添加剤としても有用である。
【0024】
【実施例】
以下に実施例を挙げて本発明を説明するが、本発明はこれら実施例により何ら限定されるものではない。
【0025】
実施例1
(ビス−(2,3,4−トリヒドロキシ−5−ベンゾイルフェニル)メタンの製造) 2,3,4−トリヒドロキシベンゾフェノン120.0g(0.05モル)、p−トルエンスルホン酸(触媒)6.0g、トルエン240g及び1,4−ジオキソラン(いずれも反応溶媒)120gを反応釜に仕込み、攪拌下に90℃に保ち、これに市販37%ホルマリン水溶液21.1g(0.26モル)を1時間かけて滴下した。その後、2時間攪拌した後、得られた反応混合物に28%アンモニア水2.1gを加え、中和した。続いて、析出した結晶を吸引濾過し、トルエンで十分に洗浄した後、乾燥機中、120℃で7時間乾燥して、結晶117gを得た。
この結晶は、融点222℃(分解)の黄色結晶であり、元素分析、質量分析及びプロトン核磁気共鳴スペクトルの結果からビス−(2,3,4−トリヒドロキシ−5−ィンゾイルフェニル)メタンであることが確認された。
【0026】
元素分析
C:66.1%、H:4.3%、N:0.05%以下
(理論値 C:68.6%、H=4.3%、N=0.00%)
EI−MS(質量分析)
M=472
H−NMR(CDC13 中)
δ(ppm、TMS基準) 帰属
3.28(s,2H) CH2
4.10(s,6H) OH
6.40(s,2H) 芳香族水素
7.04(s,10H) 芳香族水素
得られた結晶の液体クロマトグラフィーによる純度は97.8%であった。
【0027】
実施例2
(ビス−〔2,3,4−トリヒドロキシ−5−(4−ヒドロキシベンゾイル)フェニル〕メタンの製造)
2,3,4,4'−テトラヒドロキベンゾフェノン24.6g(0.1モル)、p−トルエンスルホン酸(触媒)1.0g及び酢酸(溶媒)100gを反応釜に仕込み、攪拌下ち45℃に保ち、これに市販37%ホルマリン水溶液4.4g(0.1モル)を滴下した。反応混合物の温度を80〜90℃に昇温し、2時間反応させた。
【0028】
生成した結晶を吸引濾過し、水で中性になるまで洗浄し、真空乾燥機中、120℃で10時間乾燥して、粗結晶21.2gを得た。
この粗結晶21.2gをテトラヒドロフラン25gから再結晶して、融点313〜318℃(分解)の黄色精製結晶8.2gを得た。この結晶は、元素分析、質量分析及びプロトン核磁気共鳴スペクトルの結果からビス−〔2,3,4−トリヒドロキシ−5−(4−ヒドロキシベンゾイル)フェニル〕メタンであることが確認された。
【0029】
元素分析
C:62.2%、H=4.00%、N=0.05%以下
(理論値 C:64.29%、H:3.99%、N:0.00%)
EI−MS(質量分析)
M=504
H−NMR(CDC13 中)
δ(ppm、TMS基準) 帰属
3.78(s,2H) CH2
4.79(s,10H) OH
6.73、6.88(d,4H) 芳香族水素
7.38、7.53(d,4H) 芳香族水素
6.93(s,2H) 芳香族水素
得られた結晶の液体クロマトグラフィーによる純度は97%であった。
【0030】
実施例3
(1,1−ビス−〔2,3,4−トリヒドロキシ−5−(4−ヒドロキシベンゾイル)フェニル〕エタンの製造)
2,3,4,4'−テトラヒドロキベンゾフェノン123.0g(0.5モル)、p−トルエンスルホン酸(触媒)8.5g及び酢酸(溶媒)500gを反応釜に仕込み、攪拌下ち45℃に保ち、これに市販アセトアルデヒド11.0g(0.25モル)を滴下した。反応混合物の温度を80〜90℃に昇温し、2時間反応させた。
【0031】
反応終了後、得られた反応混合物を多量の水中に投入して、生成した結晶を吸引濾過し、水で中性になるまで洗浄し、真空乾燥機中、120℃で10時間乾燥して、粗結晶90.7gを得た。
この粗結晶をテトラヒドロフラン/水の混合溶剤から再結晶して、融点269℃(分解)の黄色精製結晶を得た。この結晶は、元素分析、質量分析及びプロトン核磁気共鳴スペクトルの結果から1,1−ビス−〔2,3,4−トリヒドロキシ−5−(4−ヒドロキシベンゾイル)フェニル〕エタンであることが確認された。
【0032】
EI−MS(質量分析)
M=518
H−NMR(CDC13 中)
δ(ppm、TMS基準) 帰属
1.27、1.38(d,3H) CH3
2.20(q,1H) CH
4.79(s,10H) OH
6.73、6.87(d,2H) 芳香族水素
7.33、7.46(d,2H) 芳香族水素
6.94(s,1H) 芳香族水素[0001]
[Industrial application fields]
The present invention relates to a novel polyphenol and a method for producing the same. Specifically, the present invention relates to a novel polyphenol in which at least two molecules of a benzophenone compound having a hydroxyl group at each of the 2, 3 and 4 positions are bonded to each other by an alkylidene group at the 5 position, and a method for producing the same.
[0002]
Such polyphenols are used as raw materials for epoxy resins used as sealants, adhesives, laminate materials, electrical insulating materials, etc. in the manufacture of electrical and electronic components, or as curing agents for epoxy resins, and unsaturated polyesters. It is useful as a resin raw material. Further, it is useful as an ultraviolet absorber having excellent heat resistance, and can also be used as a developer or a color fading inhibitor suitable for use in thermal recording.
[0003]
[Prior art]
A polyphenol in which two molecules of a benzophenone compound having a hydroxyl group at each of the 2, 3, and 4 positions according to the present invention are bonded to each other by an alkylidene group at the 5 position is a novel compound and has not been known so far.
[0004]
[Problems to be solved by the invention]
An object of this invention is to provide such a novel polyphenol and its manufacturing method.
[0005]
[Means for Solving the Invention]
The polyphenols according to the invention have the general formula (I)
[0006]
[Formula 4]
Figure 0003732539
[0007]
(In the formula, R represents hydrogen or an alkyl group having 1 to 3 carbon atoms, and n represents 0, 1 or 2.)
It is represented by
[0008]
Accordingly, preferred specific examples of such polyphenols according to the present invention include, for example:
(1) bis- (2,3,4-trihydroxy-5-benzoylphenyl) methane,
(2) bis- [2,3,4-trihydroxy-5- (4-hydroxybenzoyl) phenyl] methane,
(3) bis- [2,3,4-trihydroxy-5- (3-hydroxybenzoyl) phenyl] methane,
(4) bis- [2,3,4-trihydroxy-5- (2-hydroxybenzoyl) phenyl] methane,
(5) bis- [2,3,4-trihydroxy-5- (2,4-dihydroxybenzoyl) phenyl] methane,
(6) bis- [2,3,4-trihydroxy-5- (3,4-dihydroxybenzoyl) phenyl] methane,
(7) Bis- [2,3,4-trihydroxy-5- (2,3-dihydroxybenzoyl) phenyl] methane and the like can be mentioned.
[0009]
Such polyphenols are prepared according to the invention in the presence of an acidic catalyst of the general formula (II)
R-CHO
(In the formula, R represents hydrogen or an alkyl group having 1 to 3 carbon atoms.)
Aldehyde represented by general formula (III)
[0010]
[Chemical formula 5]
Figure 0003732539
[0011]
(In the formula, n represents 0, 1 or 2.)
It can obtain by making it react with the benzophenone compound represented by these.
[0012]
Below, the manufacturing method of the polyphenol by this invention is demonstrated in detail.
The aldehyde used in the production of the polyphenol according to the present invention is represented by the general formula (II), and is formaldehyde, acetaldehyde, propionaldehyde, butyraldehyde or isobutyraldehyde. Among these, formaldehyde or acetaldehyde is preferable, and formaldehyde is particularly preferable. As the formaldehyde, a commercially available formaldehyde aqueous solution can be used as it is, and paraformaldehyde and trioxane which act in the same manner as formaldehyde in the presence of water can also be used.
[0013]
For example, when formaldehyde is used as the aldehyde, a polyphenol in which two molecules of the benzophenone compound are bonded to each other at the 5-position with a methylene group can be obtained. When acetaldehyde is used, two molecules of the benzophenone compound are Polyphenols bonded to each other at the 5-position with an ethylidene group can be obtained.
[0014]
The benzophenone compound used in the production of the polyphenol according to the present invention is represented by the general formula (III), and specific examples thereof include 2,3,4-trihydroxybenzophenone, 2,3,4,4′-tetrahydroxyl. Examples include benzophenone and 2,3,4,2 ′, 4′-pentahydroxybenzophenone.
[0015]
Examples of the acidic catalyst used in the production of the polyphenol according to the present invention include inorganic acids such as hydrochloric acid, hydrobromic acid, sulfuric acid and phosphoric acid, dimethyl sulfuric acid, methanesulfonic acid, trifluoromethanesulfonic acid, p-toluenesulfonic acid, and trichloroacetic acid. And organic acids such as oxalic acid and formic acid, and solid acids such as cation exchange resins. Of these, hydrochloric acid or p-toluenesulfonic acid is particularly preferably used.
[0016]
The amount of these acidic catalysts used is usually in the range of 0.001 to 5% by weight, particularly preferably in the range of 0.01 to 0.5% by weight, based on the total weight of the aldehyde and benzophenone compound used.
[0017]
In the production of the polyphenol according to the present invention, the aldehyde is usually used in the range of 0.25 to 0.55 mole part, preferably 0.35 mole part or more, particularly preferably, with respect to 1 mole part of the benzophenone compound. It is used in the range of 0.45 mol part or more and 0.50 mol part or less. When the amount of aldehyde used is less than 0.25 mole part relative to 1 mole part of the benzophenone compound, a relatively large amount of unreacted benzophenone compound remains, the yield of the target polyphenol is low, and the reaction is completed. The subsequent purification of the reaction product is complicated. On the other hand, when the amount of aldehyde used exceeds 0.55 mole part relative to 1 mole part of the benzophenone compound, a large amount of a high molecular weight product is produced as a by-product, and the yield of the polyphenol targeted by the present invention decreases. In addition, the purification process of the reaction product after completion of the reaction becomes complicated.
[0018]
In the production of the polyphenol according to the present invention, the above reaction can be carried out in the absence of a solvent, but in general, the reaction is preferably carried out in an organic solvent. Examples of such an organic solvent include cyclic ethers such as tetrahydrofuran, dioxane, and dioxolane, or mixed solvents of these cyclic ethers and aromatic hydrocarbon solvents such as toluene and benzene. Furthermore, organic acids such as acetic acid can also be used as part or all of the organic solvent.
When these organic solvents are used, they are used in a range of 0.5 to 20 times by weight, preferably 1 to 10 times by weight, particularly preferably in a range of 2 to 8 times by weight with respect to the benzophenone compound. .
[0019]
In the present invention, the temperature of the above reaction is usually in the range of room temperature to 100 ° C, preferably in the range of 50 to 95 ° C, and most preferably in the range of 70 to 90 ° C. When the reaction temperature is lower than room temperature, the reaction rate becomes extremely slow. On the other hand, when the reaction temperature is higher than 100 ° C. which is the boiling point of water, especially when formalin is used as an aldehyde, In order to keep it inside, it is necessary to use a pressure system, and the apparatus becomes complicated. On the other hand, the reaction time is not particularly limited, but is usually about 1 to 48 hours, and preferably about 3 to 24 hours.
[0020]
When the reaction system is cooled after completion of the reaction, the polyphenol according to the present invention represented by the general formula (I) as a reaction product is precipitated in the reaction system, and is recovered by filtration, and obtained as necessary. The obtained crystals may be washed with an appropriate organic solvent, then sufficiently washed with water and dried. Here, as the organic solvent for washing the crystal, the same organic solvent as that used as the reaction solvent can be preferably used.
[0021]
Further, when it is necessary to increase the purity of the obtained crystals, the crystals are dissolved under heating in cyclic ethers such as tetrahydrofuran, dioxane, dioxolane, etc., and then cooled and recrystallized. A refined polyphenol product according to the present invention can be obtained.
[0022]
【The invention's effect】
As described above, according to the present invention, there is provided a novel polyphenol in which two molecules of a benzophenone compound having a hydroxyl group at each of the 2, 3, and 4 positions are bonded to each other by an alkylidene group, preferably a methylene group. Provided.
Such a polyphenol according to the present invention has a larger number of hydroxyl groups in the molecule than conventional polyphenols, and also has an electron-withdrawing carbonyl group. It also has excellent functionality such as heat resistance.
[0023]
Therefore, by using the polyphenol according to the present invention, for example, as a raw material of an epoxy resin or a curing agent thereof, a cured molded product having a high crosslinking density and excellent heat resistance can be obtained. The polyphenols according to the present invention are also useful as resin additives for the purpose of weather resistance stability.
[0024]
【Example】
EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples.
[0025]
Example 1
(Production of bis- (2,3,4-trihydroxy-5-benzoylphenyl) methane) 120.0 g (0.05 mole) of 2,3,4-trihydroxybenzophenone, p-toluenesulfonic acid (catalyst) 6 0.0 g, 240 g of toluene, and 120 g of 1,4-dioxolane (all of which are reaction solvents) are charged into a reaction kettle and maintained at 90 ° C. with stirring. To this, 21.1 g (0.26 mol) of a 37% formalin aqueous solution is added. It was added dropwise over time. Then, after stirring for 2 hours, 2.1 g of 28% aqueous ammonia was added to the resulting reaction mixture for neutralization. Subsequently, the precipitated crystals were filtered by suction, washed sufficiently with toluene, and then dried in a dryer at 120 ° C. for 7 hours to obtain 117 g of crystals.
This crystal is a yellow crystal having a melting point of 222 ° C. (decomposition). From the results of elemental analysis, mass spectrometry, and proton nuclear magnetic resonance spectrum, bis- (2,3,4-trihydroxy-5-benzoylphenyl) methane is obtained. It was confirmed that.
[0026]
Elemental analysis C: 66.1%, H: 4.3%, N: 0.05% or less (theoretical value C: 68.6%, H = 4.3%, N = 0.00%)
EI-MS (mass spectrometry)
M = 472
H-NMR (CDC1 3)
δ (ppm, TMS standard)
3.28 (s, 2H) CH 2
4.10 (s, 6H) OH
6.40 (s, 2H) Aromatic hydrogen
7.04 (s, 10H) The purity of the obtained crystals of aromatic hydrogen by liquid chromatography was 97.8%.
[0027]
Example 2
(Production of bis- [2,3,4-trihydroxy-5- (4-hydroxybenzoyl) phenyl] methane)
2,4.6,4'-tetrahydroxybenzophenone (24.6 g, 0.1 mol), p-toluenesulfonic acid (catalyst) (1.0 g) and acetic acid (solvent) (100 g) were charged into a reaction kettle and stirred at 45 ° C. Then, 4.4 g (0.1 mol) of a commercially available 37% aqueous formalin solution was added dropwise thereto. The temperature of the reaction mixture was raised to 80 to 90 ° C. and reacted for 2 hours.
[0028]
The produced crystals were suction filtered, washed with water until neutral, and dried in a vacuum dryer at 120 ° C. for 10 hours to obtain 21.2 g of crude crystals.
21.2 g of the crude crystals were recrystallized from 25 g of tetrahydrofuran to obtain 8.2 g of yellow purified crystals having a melting point of 313 to 318 ° C. (decomposition). This crystal was confirmed to be bis- [2,3,4-trihydroxy-5- (4-hydroxybenzoyl) phenyl] methane from the results of elemental analysis, mass spectrometry and proton nuclear magnetic resonance spectrum.
[0029]
Elemental analysis C: 6.2%, H = 4.00%, N = 0.05% or less (theoretical value C: 64.29%, H: 3.99%, N: 0.00%)
EI-MS (mass spectrometry)
M = 504
H-NMR (CDC1 3)
δ (ppm, TMS standard)
3.78 (s, 2H) CH 2
4.79 (s, 10H) OH
6.73, 6.88 (d, 4H) Aromatic hydrogen
7.38, 7.53 (d, 4H) Aromatic hydrogen
6.93 (s, 2H) Aromatic hydrogen The purity of the obtained crystals by liquid chromatography was 97%.
[0030]
Example 3
(Production of 1,1-bis- [2,3,4-trihydroxy-5- (4-hydroxybenzoyl) phenyl] ethane)
2,3,4,4′-tetrahydroxybenzophenone 123.0 g (0.5 mol), p-toluenesulfonic acid (catalyst) 8.5 g and acetic acid (solvent) 500 g were charged into a reaction kettle and stirred at 45 ° C. 11.0 g (0.25 mol) of commercially available acetaldehyde was added dropwise thereto. The temperature of the reaction mixture was raised to 80 to 90 ° C. and reacted for 2 hours.
[0031]
After completion of the reaction, the obtained reaction mixture was poured into a large amount of water, and the produced crystals were suction filtered, washed with water until neutral, dried in a vacuum dryer at 120 ° C. for 10 hours, 90.7 g of crude crystals were obtained.
The crude crystals were recrystallized from a mixed solvent of tetrahydrofuran / water to obtain yellow purified crystals having a melting point of 269 ° C. (decomposition). This crystal was confirmed to be 1,1-bis- [2,3,4-trihydroxy-5- (4-hydroxybenzoyl) phenyl] ethane from the results of elemental analysis, mass spectrometry and proton nuclear magnetic resonance spectrum. It was done.
[0032]
EI-MS (mass spectrometry)
M = 518
H-NMR (CDC1 3)
δ (ppm, TMS standard)
1.27, 1.38 (d, 3H) CH 3
2.20 (q, 1H) CH
4.79 (s, 10H) OH
6.73, 6.87 (d, 2H) Aromatic hydrogen
7.33, 7.46 (d, 2H) Aromatic hydrogen
6.94 (s, 1H) Aromatic hydrogen

Claims (4)

一般式(I)
Figure 0003732539
(式中、Rは水素又は炭素数1〜3のアルキル基を示し、nは1又は2を示す。)
で表わされるポリフェノール。
Formula (I)
Figure 0003732539
(In the formula, R represents hydrogen or an alkyl group having 1 to 3 carbon atoms, and n represents 1 or 2. )
Polyphenol represented by
ビス−〔2,3,4−トリヒドロキシ−5−(4−ヒドロキシベンゾイル)フェニル〕メタン。  Bis- [2,3,4-trihydroxy-5- (4-hydroxybenzoyl) phenyl] methane. ビス−〔2,3,4−トリヒドロキシ−5−(2,4−ジヒドロキシベンゾイル)フェニル〕メタン。  Bis- [2,3,4-trihydroxy-5- (2,4-dihydroxybenzoyl) phenyl] methane. 1,1, 1−ビス−〔1-bis- [ 2,3,2,3, 4−トリヒドロキシ−5−(4−ヒドロキシベンゾイル)フェニル〕エタン。4-Trihydroxy-5- (4-hydroxybenzoyl) phenyl] ethane.
JP26525994A 1994-10-28 1994-10-28 Novel polyphenol and method for producing the same Expired - Fee Related JP3732539B2 (en)

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