JP5197439B2 - Process for producing bis (3-nitro-4-hydroxyphenyl) s - Google Patents

Process for producing bis (3-nitro-4-hydroxyphenyl) s Download PDF

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JP5197439B2
JP5197439B2 JP2009045685A JP2009045685A JP5197439B2 JP 5197439 B2 JP5197439 B2 JP 5197439B2 JP 2009045685 A JP2009045685 A JP 2009045685A JP 2009045685 A JP2009045685 A JP 2009045685A JP 5197439 B2 JP5197439 B2 JP 5197439B2
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hydroxyphenyl
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nitric acid
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JP2010195748A (en
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豊 井田
圭一 横田
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Air Water Inc
Sumitomo Bakelite Co Ltd
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Sumitomo Bakelite Co Ltd
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本発明は、下記の化学式(1)で表されるビス(3−ニトロ−4−ヒドロキシフェニル)類のうち、X=CH2、CHCH3の化合物の製造法に関する。更に詳しくは、化学式(1)で表されるビス(3−ニトロ−4−ヒドロキシフェニル)類のうち、X=CH2、CHCH3の化合物を高純度で製造する方法に関する。 The present invention relates to a method for producing a compound of X = CH 2 and CHCH 3 among bis (3-nitro-4-hydroxyphenyl) s represented by the following chemical formula (1). More specifically, the present invention relates to a method for producing a compound of X═CH 2 and CHCH 3 with high purity among bis (3-nitro-4-hydroxyphenyl) s represented by the chemical formula (1).

Figure 0005197439
Figure 0005197439

ビス(3−アミノ−4−ヒドロキシフェニル)類は耐熱性ポリマー等の原料として重要な化合物であり、対応するビス(3−ニトロ−4−ヒドロキシフェニル)化合物を還元することで得られる。   Bis (3-amino-4-hydroxyphenyl) s are important compounds as raw materials for heat-resistant polymers and the like, and can be obtained by reducing the corresponding bis (3-nitro-4-hydroxyphenyl) compounds.

ビス(3−ニトロ−4−ヒドロキシフェニル)類の製造方法としては、2,2−ビス(4−ヒドロキシフェニル)ヘキサフルオロプロパン(ビスフェノールAF)を原料として、クロロホルム溶媒中で硝酸によりニトロ化反応を行う方法(特許文献1)、酢酸溶媒中で硝酸によりニトロ化反応を行う方法(特許文献2)、硫酸水溶媒中で硫酸と硝酸より調製した混酸によりニトロ化反応を行う方法(特許文献3)等が知られている。   As a method for producing bis (3-nitro-4-hydroxyphenyl) s, nitration reaction is carried out with nitric acid in chloroform solvent using 2,2-bis (4-hydroxyphenyl) hexafluoropropane (bisphenol AF) as a raw material. A method of performing nitration reaction with nitric acid in an acetic acid solvent (Patent Document 2), a method of performing nitration reaction with a mixed acid prepared from sulfuric acid and nitric acid in a sulfuric acid aqueous solvent (Patent Document 3) Etc. are known.

また、ビス(3−ニトロ−4−ヒドロキシフェニル)類の製造する他の方法として、2,2−ビス(4−ヒドロキシフェニル)プロパン(ビスフェノールA)を原料として、酢酸溶媒中で硝酸によりニトロ化反応を行う方法(特許文献4)、塩化メチレン溶媒中で硝酸によりニトロ化反応を行う方法(特許文献5)等が知られている。   Further, as another method for producing bis (3-nitro-4-hydroxyphenyl) s, nitration with nitric acid in acetic acid solvent using 2,2-bis (4-hydroxyphenyl) propane (bisphenol A) as a raw material A method of performing a reaction (Patent Document 4), a method of performing a nitration reaction with nitric acid in a methylene chloride solvent (Patent Document 5), and the like are known.

特許第2534267号Patent No. 2534267 特開平01−301653号JP-A-01-301653 特開平11−106365号JP-A-11-106365 特開平11−60545号JP-A-11-60545 WO2004−90070パンフレットWO2004-90070 pamphlet

しかしながら、従来公知のビス(3−ニトロ−4−ヒドロキシフェニル)類の製造方法には、化学式(1)で示される化合物のうちX=CH2、CHCH3の化合物を原料として反応した例はなく、実際に前記記載の溶媒で反応してみたところ、ビス(3−ニトロ−4−ヒドロキシフェニル)の収率及び品質は、著しく低いものであった。2つの芳香環に挟まれたメチレン基、または2つの芳香環のベンジル位に水素を有することから、反応性に富み、容易に分解しやすいためと思われる。 However, there is no example in which the conventionally known methods for producing bis (3-nitro-4-hydroxyphenyl) s are reacted using a compound of X = CH 2 or CHCH 3 among the compounds represented by the chemical formula (1). When actually reacting with the above-mentioned solvents, the yield and quality of bis (3-nitro-4-hydroxyphenyl) were remarkably low. It seems to be because of having a methylene group sandwiched between two aromatic rings or hydrogen at the benzylic position of two aromatic rings, it is highly reactive and easily decomposes.

本発明の目的は、化学式(1)で表わされるビス(3−ニトロ−4−ヒドロキシフェニル)類でX=CH2、CHCH3の化合物について、高収率及び高純度で得る手段を提供することにある。 An object of the present invention is to provide means for obtaining a compound of X = CH 2 and CHCH 3 in the bis (3-nitro-4-hydroxyphenyl) s represented by the chemical formula (1) with high yield and high purity. It is in.

本発明者は、上記にあげた課題を解決すべく鋭意研究を行った結果、化学式(2)で表わされるビス(4−ヒドロキシフェニル)類でX=CH2の化合物であるビス(4−ヒドロキシフェニル)メタン、或いはX=CHCH3の化合物であるビス(4−ヒドロキシフェニル)エタンをアセトニトリル溶媒中、硝酸でニトロ化することによりビス(3−ニトロ−4−ヒドロキシフェニル)メタン、ビス(3−ニトロ−4−ヒドロキシフェニル)エタンが高収率、高純度で得られることを見出し、本発明に到達したものである。 As a result of intensive studies to solve the above problems, the present inventor has found that bis (4-hydroxy) which is a bis (4-hydroxyphenyl) s represented by the chemical formula (2) and is a compound of X = CH 2. Phenyl) methane or bis (4-hydroxyphenyl) ethane, which is a compound of X═CHCH 3 , is nitrated with nitric acid in an acetonitrile solvent to thereby produce bis (3-nitro-4-hydroxyphenyl) methane, bis (3- It has been found that nitro-4-hydroxyphenyl) ethane can be obtained in high yield and high purity, and the present invention has been achieved.

Figure 0005197439
Figure 0005197439

すなわち、本発明は、ビス(4−ヒドロキシフェニル)メタンまたはビス(4−ヒドロキシフェニル)エタンをアセトニトリル溶媒中、硝酸でニトロ化することを特徴とするビス(3−ニトロ−4−ヒドロキシフェニル)メタン、ビス(3−ニトロ−4−ヒドロキシフェニル)エタンの製造方法に関する。   That is, the present invention relates to bis (3-nitro-4-hydroxyphenyl) methane characterized in that bis (4-hydroxyphenyl) methane or bis (4-hydroxyphenyl) ethane is nitrated with nitric acid in an acetonitrile solvent. Relates to a process for producing bis (3-nitro-4-hydroxyphenyl) ethane.

本発明によれば、化学式(1)で表わされるビス(3−ニトロ−4−ヒドロキシフェニル)類で従来使用されていた溶媒である酢酸に比べて純度および収率が高くなる。すなわち、本発明に係る製造方法を採用することで初めて工業的レベルでの生産が可能となる。   According to the present invention, purity and yield are higher than acetic acid, which is a solvent conventionally used in the bis (3-nitro-4-hydroxyphenyl) s represented by the chemical formula (1). That is, production at an industrial level is possible only when the manufacturing method according to the present invention is employed.

以下、本発明の製造方法、すなわち、ビス(4−ヒドロキシフェニル)類を硝酸によりニトロ化してビス(3−ニトロ−4−ヒドロキシフェニル)類を製造する方法において、溶媒としてアセトニトリルを用いる方法を詳細に説明する。   Hereinafter, in the production method of the present invention, that is, the method of producing bis (3-nitro-4-hydroxyphenyl) s by nitration of bis (4-hydroxyphenyl) s with nitric acid, a method using acetonitrile as a solvent is described in detail. Explained.

使用する溶媒としてはアセトニトリルを用いる。溶媒使用量は特に限定されず、経済性も考慮しつつニトロ化の反応が適切に進行するように適宜決定すればよい。通常、ビス(4−ヒドロキシフェニル)類に対して0.1〜50倍(重量比)であり、好ましくは1〜10倍である。   Acetonitrile is used as a solvent to be used. The amount of the solvent used is not particularly limited, and may be appropriately determined so that the nitration reaction appropriately proceeds in consideration of economy. Usually, it is 0.1-50 times (weight ratio) with respect to bis (4-hydroxyphenyl), Preferably it is 1-10 times.

アセトニトリルが好ましい理由は必ずしも明らかではないが、実施例において後述するように、1回の再結晶で99%以上の純度とすることができたことから、アセトニトリルを溶媒として使用することで、ジニトロ化の転化率のみならずジニトロ化の選択率も従来技術に係る溶媒に比べて高まっているものと推測される。   The reason why acetonitrile is preferred is not necessarily clear, but as will be described later in the examples, it was possible to achieve a purity of 99% or more by one recrystallization, and therefore, by using acetonitrile as a solvent, dinitration can be achieved. It is presumed that not only the conversion rate but also the dinitration selectivity is increased compared to the solvents according to the prior art.

ニトロ化剤として使用する硝酸は濃度が10〜98%(%は質量%を意味する。以下特に断らない限り同じ)水溶液であり、市販の工業用硝酸をそのまま、または水で希釈して使用する。収率を高めつつジニトロ化の選択性を高める観点から好ましい硝酸濃度は40〜80%である。硝酸の使用量は通常、ビス(4−ヒドロキシフェニル)類1モルに対して1.8〜3モルであり、使用量が過度に少ない場合には反応が進行しにくくなり、過度に多い場合にはニトロ化が進みすぎるばかりでなく、分解反応も起こりやすくなる。好ましくは1.9〜2.5モルである。   Nitric acid used as a nitrating agent is an aqueous solution having a concentration of 10 to 98% (% means mass%. The same applies unless otherwise specified), and commercially available nitric acid is used as it is or diluted with water. . From the viewpoint of increasing the dinitration selectivity while increasing the yield, the preferred nitric acid concentration is 40-80%. The amount of nitric acid used is usually 1.8 to 3 moles per mole of bis (4-hydroxyphenyl) s. When the amount used is excessively small, the reaction is difficult to proceed. Not only does nitration progress too much, but it also tends to cause decomposition reactions. Preferably it is 1.9-2.5 mol.

反応温度は通常、−20〜50℃であり、過度に低い場合には反応が進行せず、過度に高い場合には副反応の影響が多くなり純度、収率が低下してしまう。純度および収率を高度に両立する観点から好ましい反応温度は−10〜30℃である。   The reaction temperature is usually −20 to 50 ° C., and when it is excessively low, the reaction does not proceed. When it is excessively high, the influence of side reactions increases and the purity and yield are reduced. A preferable reaction temperature is −10 to 30 ° C. from the viewpoint of achieving both high purity and yield.

反応の操作方法としては、ビス(4−ヒドロキシフェニル)類を溶媒中に分散させたまま撹拌し、所定の温度にしてから所定量の硝酸水溶液を滴下して加える。または、溶媒中にまず所定量の硝酸水溶液を添加後、所定の温度にしてからビス(4−ヒドロキシフェニル)類を添加する。硝酸水溶液の滴下やビス(4−ヒドロキシフェニル)類の添加によって温度が上昇するため、上記の温度範囲になるように滴下/添加速度を調整したり、適宜冷却手段を動作させたりすることが好ましい。   As a method of operating the reaction, bis (4-hydroxyphenyl) s are stirred while being dispersed in a solvent, and after a predetermined temperature is reached, a predetermined amount of nitric acid aqueous solution is added dropwise. Alternatively, a predetermined amount of nitric acid aqueous solution is first added to the solvent, and then bis (4-hydroxyphenyl) is added after a predetermined temperature is reached. Since the temperature rises due to the dropwise addition of nitric acid aqueous solution or the addition of bis (4-hydroxyphenyl) s, it is preferable to adjust the dropping / addition rate so as to be within the above temperature range or to operate the cooling means appropriately. .

反応混合物を所定の温度で原料がほぼなくなるまで撹拌する。なお、反応中の反応混合物における原料濃度は高速液体クロマトグラフィー(HPLC)など公知の方法により確認すればよい。攪拌時間は典型的には30分〜2時間である。反応終了後、反応液に含まれる混合物をろ過する。ろ過ケーキを水で洗浄後、乾燥することで目的物を得る。   The reaction mixture is stirred at a given temperature until there is almost no feed. In addition, what is necessary is just to confirm the raw material density | concentration in the reaction mixture in reaction by well-known methods, such as a high performance liquid chromatography (HPLC). The stirring time is typically 30 minutes to 2 hours. After completion of the reaction, the mixture contained in the reaction solution is filtered. The target product is obtained by washing the filter cake with water and drying.

また、得られた目的物を適当な溶媒(例えばN−メチル−2−ピロリジノン)を用いて溶解し、これを再結晶することにより、容易に高純度にすることができる。   Moreover, it can be easily made highly pure by melt | dissolving the obtained target object using a suitable solvent (for example, N-methyl-2-pyrrolidinone), and recrystallizing this.

次に実施例によって本発明をさらに具体的に説明するが、本発明がこれらの具体例にのみ限定されるものではない。
なお、純度分析はHPLCを用いて実施し、純度は面積比率(単位:面積%)により求めた(以下、「HPLC純度」という。)。また、HPLCの測定条件は以下に示す:
カラム:L−Column ODS((財)化学物質評価研究機構製、4.6×150mm)、
カラム温度:40℃、
注入量:10μL、
流 量:1.0mL/分、
検出器:UV=254nm、
移動相:A/B=60/40(0分)→90/10(20〜30分)、
A:メタノール、
B:20mMリン酸二水素カリウム(pH=3.6)、
サンプル調製:
メタン:固体10mgをDMF50mLに溶解、
エタン:固体10mgをメタノール50mLに溶解。
EXAMPLES Next, although an Example demonstrates this invention further more concretely, this invention is not limited only to these specific examples.
The purity analysis was performed using HPLC, and the purity was determined by area ratio (unit: area%) (hereinafter referred to as “HPLC purity”). The HPLC measurement conditions are as follows:
Column: L-Column ODS (manufactured by Chemicals Research Institute, 4.6 × 150 mm),
Column temperature: 40 ° C
Injection volume: 10 μL,
Flow rate: 1.0 mL / min,
Detector: UV = 254 nm,
Mobile phase: A / B = 60/40 (0 minutes) → 90/10 (20-30 minutes),
A: methanol,
B: 20 mM potassium dihydrogen phosphate (pH = 3.6),
Sample preparation:
Methane: 10 mg of solid dissolved in 50 mL of DMF,
Ethane: 10 mg of solid dissolved in 50 mL of methanol.

実施例1
温度計、ジムロート冷却器及び攪拌機を備えた300mL四つ口フラスコに、ビス(4−ヒドロキシフェニル)メタン10g(0.050モル)、アセトニトリル100gを加えて撹拌し、15〜20℃で温度を保持しながら69%硝酸10.0g(理論モル比:2.2)を1時間かけて滴下した。温度を保持しながら1時間撹拌後にろ過し、アセトニトリル10g、さらに水10gで洗浄してウェットケーキ10.1gを得た。真空乾燥機で乾燥し、乾燥品8.1gを黄橙色結晶として得た。HPLC純度92.8%、収率54.7%(対理論)。
Example 1
Add 300 g of bis (4-hydroxyphenyl) methane and 100 g of acetonitrile to a 300 mL four-necked flask equipped with a thermometer, Dimroth cooler and stirrer, and maintain the temperature at 15 to 20 ° C. Then, 10.0 g of 69% nitric acid (theoretical molar ratio: 2.2) was added dropwise over 1 hour. The mixture was stirred for 1 hour while maintaining the temperature, filtered, and washed with 10 g of acetonitrile and 10 g of water to obtain 10.1 g of a wet cake. It dried with the vacuum dryer and obtained 8.1g of dried products as a yellow-orange crystal | crystallization. HPLC purity 92.8%, yield 54.7% (versus theory).

実施例2
温度計、ジムロート冷却器及び攪拌機を備えた300mL四つ口フラスコに、アセトニトリル100g、69%硝酸10.0g(理論モル比:2.2)を加えて撹拌し、15〜20℃で温度を保持しながらビス(4−ヒドロキシフェニル)メタン10g(0.050モル)を1時間かけて添加した。温度を保持しながら1時間撹拌後にろ過し、アセトニトリル10g、さらに水10gで洗浄してウェットケーキ11.5gを得た。真空乾燥機で乾燥し、乾燥品9.1gを黄色結晶として得た。HPLC純度95.4%、収率60.3%(対理論)。
Example 2
A 300 mL four-necked flask equipped with a thermometer, Dimroth cooler, and stirrer was added with 100 g of acetonitrile and 10.0 g of 69% nitric acid (theoretical molar ratio: 2.2) and stirred, and the temperature was maintained at 15 to 20 ° C. Then, 10 g (0.050 mol) of bis (4-hydroxyphenyl) methane was added over 1 hour. The mixture was stirred for 1 hour while maintaining the temperature, filtered, and washed with 10 g of acetonitrile and 10 g of water to obtain 11.5 g of a wet cake. It dried with the vacuum dryer and obtained 9.1g of dried products as yellow crystals. HPLC purity 95.4%, yield 60.3% (versus theory).

実施例3
温度計、ジムロート冷却器及び攪拌機を備えた5L四つ口フラスコに、アセトニトリル1000g、69%硝酸200.9g(理論モル比:2.2)を加えて撹拌し、0〜5℃に冷却後、温度を保持しながらビス(4−ヒドロキシフェニル)メタン200.3g(1.00モル)を4時間かけて滴下した。温度を保持しながら1時間撹拌後にろ過し、アセトニトリル200g、さらに水200gで洗浄してウェットケーキ226.0gを得た。真空乾燥機で乾燥し、乾燥品178.5gを黄色結晶として得た。HPLC純度93.4%、収率54.2%(対理論)。
Example 3
To a 5 L four-necked flask equipped with a thermometer, a Dimroth cooler and a stirrer, 1000 g of acetonitrile and 200.9 g of 69% nitric acid (theoretical molar ratio: 2.2) were added and stirred. After cooling to 0 to 5 ° C., While maintaining the temperature, 200.3 g (1.00 mol) of bis (4-hydroxyphenyl) methane was added dropwise over 4 hours. The mixture was stirred for 1 hour while maintaining the temperature, filtered, and washed with 200 g of acetonitrile and 200 g of water to obtain 226.0 g of a wet cake. It dried with the vacuum dryer and obtained 178.5g of dried products as a yellow crystal. HPLC purity 93.4%, yield 54.2% (versus theory).

これにN−メチル−2−ピロリジノン1000gを加え、加熱溶解後、水167gを加えてから15〜20℃に冷却した。温度を保持しながら1時間撹拌後にろ過し、水167gで洗浄してウェットケーキ157.8gを得た。真空乾燥機で乾燥し、乾燥品142.0gを黄色結晶として得た。HPLC純度99.1重量%、収率45.7モル%(対理論)であった。   To this was added 1000 g of N-methyl-2-pyrrolidinone, and after heating and dissolving, 167 g of water was added, and then cooled to 15 to 20 ° C. The mixture was stirred for 1 hour while maintaining the temperature, filtered, and washed with 167 g of water to obtain 157.8 g of a wet cake. It dried with the vacuum dryer and obtained 142.0g of dried products as a yellow crystal. The HPLC purity was 99.1% by weight, and the yield was 45.7 mol% (theoretical).

実施例4
温度計、ジムロート冷却器及び攪拌機を備えた100mL四つ口フラスコに、ビス(4−ヒドロキシフェニル)エタン5g(0.023モル)、アセトニトリル10gを加えて撹拌し、0〜5℃に冷却後、温度を保持しながら61%硝酸5.3g(理論モル比:2.2)を1時間かけて滴下した。温度を保持しながら1時間撹拌後、さらに61%硝酸1.2g(理論モル比:0.5)を滴下し、温度を保持しながら1時間撹拌後、室温まで徐々に昇温した。温度を保持したまま1時間撹拌後にろ過し、アセトニトリル5g、さらに水5gで洗浄してウェットケーキ6.1gを得た。真空乾燥機で乾燥し、乾燥品4.5gを黄色結晶として得た。HPLC純度90.9%、収率59.6%(対理論)。
Example 4
In a 100 mL four-necked flask equipped with a thermometer, a Dimroth cooler and a stirrer, 5 g (0.023 mol) of bis (4-hydroxyphenyl) ethane and 10 g of acetonitrile were added and stirred. After cooling to 0 to 5 ° C., While maintaining the temperature, 5.3 g of 61% nitric acid (theoretical molar ratio: 2.2) was added dropwise over 1 hour. After stirring for 1 hour while maintaining the temperature, 1.2 g of 61% nitric acid (theoretical molar ratio: 0.5) was further added dropwise. After stirring for 1 hour while maintaining the temperature, the temperature was gradually raised to room temperature. The mixture was stirred for 1 hour while maintaining the temperature, filtered, and washed with 5 g of acetonitrile and 5 g of water to obtain 6.1 g of a wet cake. It dried with the vacuum dryer and obtained 4.5 g of dried products as yellow crystals. HPLC purity 90.9%, yield 59.6% (versus theory).

比較例1
温度計、ジムロート冷却器及び攪拌機を備えた500mL四つ口フラスコに、ビス(4−ヒドロキシフェニル)メタン30g(0.15モル)、酢酸150gを加えて撹拌し、15〜20℃で温度を保持しながら69%硝酸27.4g(理論モル比:2.0)を1時間かけて滴下した。温度を保持したまま1時間撹拌後にろ過し、水90gで洗浄してウェットケーキ36.1gを得た。真空乾燥機で乾燥し、乾燥品30.3gを赤橙色結晶として得た。HPLC純度78.4%、収率47.2%(対理論)。
Comparative Example 1
Bis (4-hydroxyphenyl) methane 30 g (0.15 mol) and acetic acid 150 g are added to a 500 mL four-necked flask equipped with a thermometer, a Dimroth cooler, and a stirrer, and the temperature is maintained at 15 to 20 ° C. Then, 27.4 g of 69% nitric acid (theoretical molar ratio: 2.0) was added dropwise over 1 hour. The mixture was stirred for 1 hour while maintaining the temperature, filtered, and washed with 90 g of water to obtain 36.1 g of a wet cake. It dried with the vacuum dryer and obtained 30.3g of dried products as red orange crystal | crystallization. HPLC purity 78.4%, yield 47.2% (versus theory).

比較例2
温度計、ジムロート冷却器及び攪拌機を備えた100mL四つ口フラスコに、ビス(4−ヒドロキシフェニル)エタン5g(0.023モル)、酢酸10gを加えて撹拌し、5〜10℃に冷却後、温度を保持しながら61%硝酸5.3g(理論モル比:2.2)を1時間かけて滴下した。温度を保持したまま1時間撹拌後、さらに61%硝酸1.2g(理論モル比:0.5)を滴下し、温度を保持しながら1時間撹拌後、室温まで徐々に昇温した。温度を保持したまま1時間撹拌後にろ過し、水5gで洗浄してウェットケーキ7.2gを得た。真空乾燥機で乾燥し、乾燥品4.9gを黄茶色結晶として得た。HPLC純度75.6%、収率49.4%(対理論)。
Comparative Example 2
In a 100 mL four-necked flask equipped with a thermometer, a Dimroth cooler and a stirrer, 5 g (0.023 mol) of bis (4-hydroxyphenyl) ethane and 10 g of acetic acid were added and stirred, and cooled to 5 to 10 ° C. While maintaining the temperature, 5.3 g of 61% nitric acid (theoretical molar ratio: 2.2) was added dropwise over 1 hour. After stirring for 1 hour while maintaining the temperature, 1.2 g of 61% nitric acid (theoretical molar ratio: 0.5) was further added dropwise. After stirring for 1 hour while maintaining the temperature, the temperature was gradually raised to room temperature. The mixture was stirred for 1 hour while maintaining the temperature, filtered, and washed with 5 g of water to obtain 7.2 g of a wet cake. It dried with the vacuum dryer and obtained 4.9g of dried products as yellow brown crystals. HPLC purity 75.6%, yield 49.4% (versus theory).

Claims (1)

ビス(4−ヒドロキシフェニル)メタンまたはビス(4−ヒドロキシフェニル)エタンをニトロ化してビス(3−ニトロ−4−ヒドロキシフェニル)メタンまたはビス(3−ニトロ−4−ヒドロキシフェニル)エタンを製造する方法において、溶媒としてアセトニトリルを用いることを特徴とするビス(3−ニトロ−4−ヒドロキシフェニル)メタンまたはビス(3−ニトロ−4−ヒドロキシフェニル)エタンの製造方法。 Process for producing bis (3-nitro-4-hydroxyphenyl) methane or bis (3-nitro- 4-hydroxyphenyl) ethane by nitration of bis (4-hydroxyphenyl) methane or bis (4-hydroxyphenyl) ethane A process for producing bis (3-nitro-4-hydroxyphenyl) methane or bis (3-nitro-4-hydroxyphenyl) ethane , characterized in that acetonitrile is used as a solvent.
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