JPS59139336A - Production of trifluoromethylphenol - Google Patents

Production of trifluoromethylphenol

Info

Publication number
JPS59139336A
JPS59139336A JP58013916A JP1391683A JPS59139336A JP S59139336 A JPS59139336 A JP S59139336A JP 58013916 A JP58013916 A JP 58013916A JP 1391683 A JP1391683 A JP 1391683A JP S59139336 A JPS59139336 A JP S59139336A
Authority
JP
Japan
Prior art keywords
solvent
mixed solvent
reaction
present
added
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP58013916A
Other languages
Japanese (ja)
Inventor
Yasumasa Takahashi
高橋 予正
Toshiro Chiba
千葉 俊郎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Asahi Kasei Corp
Asahi Chemical Industry Co Ltd
Original Assignee
Asahi Chemical Industry Co Ltd
Asahi Kasei Kogyo KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Asahi Chemical Industry Co Ltd, Asahi Kasei Kogyo KK filed Critical Asahi Chemical Industry Co Ltd
Priority to JP58013916A priority Critical patent/JPS59139336A/en
Publication of JPS59139336A publication Critical patent/JPS59139336A/en
Pending legal-status Critical Current

Links

Classifications

    • 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

Landscapes

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

Abstract

PURPOSE:To prepare the titled compound useful as a preparation raw material of pharmaceuticals, etc., in shortened reaction time, in high yield, by adding potassium hydroxide to a specific mixed solvent and hydrolyzing 3,4-dichlorobenzotrifluoride in the solution keeping the reaction temperature at a preset level. CONSTITUTION:Potassium hydroxide is added to a mixed solvent comprising an inert aprotic solvent and an aliphatic tertiary alcohol, and the mixture is maintained at 100-130 deg.C. 3,4-Dichlorobenzotrifluoride is added to the above mixed solvent and made to react for 0.5-4hr to effect the hydrolysis and obtain the objective 2-chloro-4-trifluoromethylphenol in a yield of >=90%. The inert aprotic solvent is preferably dimethylsulfoxide (DMSO) or hexamethylphosphoramide, especially DMSO. The aliphatic alcohol is e.g. t-butanol, pinacol, 2,5- dimethylhexane-2,5-diol, etc.

Description

【発明の詳細な説明】[Detailed description of the invention]

本発明は、トリフルオルメチルフェノール造法に関し、
更に詳しくは、3.4−ジクロルペンシトリフルオライ
ド(以下.DCBTFという)の苛性カリによる加水分
解により、選択的に2−り本化合物は、医薬,農薬など
の生理活性物質を製造する原料として有用な物質である
。本化合物t−製造する公知の方法としては,皮とえば
.DC11’l’Fをアルカリ金属の了ルコラートと反
応させ,3−クロル−4−アルコキシペンシトリフルオ
ライドをー.F1合成し、これに臭化水素酸、又はピリ
ジンのハロゲン化水素酸塩と約390℃で処理する方法
がある.、i友、特開昭55−353726号公キシル
化溶媒を加えてから、約り0℃〜約300℃、好ましく
は65〜85℃の温度で,5時間〜約5.5日開反応さ
せることにエクトリフルオルメテルフェルートヲ製造す
ることが知られている。 前者の方法は反応金2段階で実施するtめ工業的製法と
しては不利である、これに対し後者の方法は反
The present invention relates to a method for producing trifluoromethylphenol,
More specifically, by hydrolyzing 3,4-dichloropene citrifluoride (hereinafter referred to as DCBTF) with caustic potassium, the present compound is selectively 2-dichlorofluoride, which is useful as a raw material for producing physiologically active substances such as medicines and agricultural chemicals. It is a substance. Known methods for producing this compound include, for example. DC11'l'F was reacted with an alkali metal chlorate to form 3-chloro-4-alkoxypencitrifluoride. There is a method of synthesizing F1 and treating it with hydrobromic acid or pyridine hydrohalide at about 390°C. , i-yu, JP-A No. 55-353726 After adding the xylation solvent, open reaction is carried out at a temperature of about 0°C to about 300°C, preferably 65 to 85°C, for 5 hours to about 5.5 days. In particular, it is known to produce etrifluoromethane ferrite. The former method is disadvantageous as an industrial production method because it is carried out in two reaction steps, whereas the latter method is disadvantageous.

【6時間
が長く,一般的に、最も好ましい反応争件においても1
0〜55時間を要し、さらに。 へ体的に本化合物を製造する実施例では反応温度62〜
75℃で34〜」32時間反応を行っている。 本発明者らは、かかる現状に鑑み本化合物を工業的に、
有利に!!造することを目的とし7て鋭意研究を行った
結果、格glに改良され−た2−クロル−4−トI+フ
ルオルメチルフェノールの製造方法を見出すに至ったの
である。 即ち、本発明に従えば、不活件庁非ゾロトン溶媒および
脂肪族3級アルコールエリ威る共溶媒中に苛性カリを存
在すしめ、これに100〜130℃の温度範囲で、3,
4−ジクロルベンシトリフルオライドを加える方法にJ
ニジ30分〜4時間反旧さ萌ることを特徴とする2−ク
ロル−4−トリフルオルメチルフェノール全製造する方
法が提供される7本発明方法においては、先ず溶媒とし
て1反応中に自ら1化を受けることなく・1効なものと
して極性の非プロトン溶媒を用いる。たとえは、ジメチ
ルスルフォキサイドCDMSO”1.ヘギサメチルノオ
スフオルアミドなどが好適に用いられる。中でも、DM
SOは安全性も高く、安価で有利な溶媒でめる。好まし
い溶媒の使用量は、DCBTF に対し−C3〜20倍
tである。本発明方法では、さらに、脂肪族3級アルコ
ールを併用し、共溶媒中で反応が行なわれる。脂肪族3
級アルコールとしては、たとえば、t−ブタノール、ピ
ナコール、2,5−ジメチル−ヘキサン−2,5−ジオ
ールなどの中から選ばれる。本発明方法においては、脂
肪族3級アルコールの使用量は1本化合物に対して約2
倍モル以上使用され、好ましくは2〜4倍モルが使用さ
れる。1だ、加水分解試剤としては苛性カリが用いられ
、好ましくは、粉砕されたものt使用する。苛性カリの
量はDCBTFに対して、4倍モル以上、好ましくは約
6〜10倍モルの量で使用される。 本発明方法において最も重要なことは、上記の共溶媒中
に苛性カリヲ加え、反応温it保ちながら、原料のI)
CBTF?少し宛加えることT′ある。 このようにすることにより比較的に高温・短時間および
本化合物が共通に所有する、トリフルメルメチル基の分
j!lvを抑制し、且つ反応時間を大幅に短縮し、さら
に本化合物の収率を最島にすることができる。 本発明方法においては、反応温度は300〜130℃が
適用され、さらに好ましくは、505〜120℃が適用
される。反応時間は、比較的高温において、短時間、す
なわち0.5〜4時間、好ましくは約1時間〜約2時間
の範囲で実施することが必要である。 本発明方法において規定され之諸條件を厳密に適用する
ことに、1、本化合物が90チ以上の1区率で、且つ工
業的にも、経済的にも有利な方法で製造することができ
る。 本発明方法は、不活性ガス雰囲気下で実施するときは、
反応生成物それ自身、おLび引継いて中和、抽出、蒸と
4などにぶって得られた本化合物の着色性が著しく改善
されるので好ましい。本発明方法はバッチ式反応器、あ
るいは連続式反応器のいずれの反応器金剛いても実施す
ること力Iできる。 次に実施例金挙げて、本発明をさらに詳しく説明する。 実施例1 攪拌機及び還流冷却器を備えた50−の三1」7ラヌコ
中にジメチルスルフォキサイド(以下、DMSOと略称
する)JO−1t−ブチルアルコール1.6 W (2
1,6mmot)、粉砕した苛性カリ2.5f(45m
moj)’r加へ、湯浴中で12o〜J22℃に加熱し
ながら、 DCBTF J y (4,65mmoりを
滴下し7’j、 1時間反応を続け、終了後油状物質を
エーテル151neで3回抽出し、抽出液をガスクロマ
トグラフで分析を行った処(5%FFAPカラム(日本
ガスクロ工業(株)製)、380℃)、DCBTFは消
失し、目的の本化合物が0839 (4,22mmot
)(収率90チ)得られたことが確認された。 実施例2 撹拌機及びM紺冷却器を備えた250−のミロフラスコ
中に、DMSOJOOml、、t−ブチルアルコール1
5.8 f (0,2J mot)及び粉砕した苛性カ
リ20f(0,35mot)’に入れ、窒素気流中32
0〜125℃で加熱、攪拌を行い、DCBTF J O
f(46,5mmo7)’fH滴下反応させた、反応時
間は65分であった0反応終了後6N−塩酸一氷中に注
ぎ、油層全分別し、更にエーテル40meで4回抽出を
行った。抽出液に無水芒硝を加入、脱水後、エーテルを
留去し、残液を減圧(16nm)Ig )で蒸溜した。 沸点65〜7 J ℃/J 6讐Hg’7)留分7.8
t(収率86チ)が得られた。釜残にDMS O及び本
化合物0.3 f (3,2%)が更に残存していた。 実施例3 実施例1と同様に、苛性カリ2 F (30mmot)
を用い1反応温度を90〜145℃の範囲で変えて実施
した。結果は以下の表1に示す通りであった・    
    Ll 1     88〜90        582   
 J05〜106        893】20〜12
3     9 ) 4   128〜130        8 85  
 145〜347        6 7冥施汐り4 t−7’f−ルアルコールk DCB’I’F vCK
j L、、 1〜8倍モルの範囲で変えて実施した以外
は実施例1と同様にして実験した。結果はμ下の表2に
示す通りeあっンh。 表 2 」       l         422    
 2        88 3     4        91 4     8        90 実IM向5 苛性カリのL)e B T Fに対−J−るモル比と罠
えた以外は実施flll’に繰返した。結果は表3に示
す通りであった。 表3 、  l   1.8   5] 2  3.6   73 :3  5.4   91 49.0  89 実施例6 反応時間を30分、1,2,4.8時間と笈えた以外は
尖施汐jJ Jと同様にして実験を行った。結果は以下
の表4にボす通りであった。 汲 4 1 30分       72 2   1時間        90 3   211i[目]87 4   4時間       61 5  8時10J       17
[6 hours long, typically even in the most favorable reaction cases
It takes 0-55 hours and more. In the example in which the present compound is produced hepatically, the reaction temperature is 62~
The reaction was carried out at 75°C for 34 to 32 hours. In view of the current situation, the present inventors have developed the present compound industrially.
To your advantage! ! As a result of intensive research with the aim of producing 2-chloro-4-to-I+fluoromethylphenol, they discovered a highly improved method for producing 2-chloro-4-to-I+fluoromethylphenol. That is, according to the present invention, caustic potash is present in a co-solvent containing an inert non-zolotonic solvent and an aliphatic tertiary alcohol, and 3.
J to the method of adding 4-dichlorobencitrifluoride
A method for producing 2-chloro-4-trifluoromethylphenol, which is characterized by aging for 30 minutes to 4 hours, is provided. A polar aprotic solvent is used as an effective solvent without undergoing chemical reaction. For example, dimethyl sulfoxide CDMSO''1.
SO is highly safe and can be prepared using inexpensive and advantageous solvents. The preferred amount of solvent used is -C3 to 20 times the amount of DCBTF. In the method of the present invention, an aliphatic tertiary alcohol is further used in combination, and the reaction is carried out in a co-solvent. aliphatic 3
The alcohol is selected from, for example, t-butanol, pinacol, 2,5-dimethyl-hexane-2,5-diol, and the like. In the method of the present invention, the amount of aliphatic tertiary alcohol used is approximately 2
It is used in an amount of 2 to 4 times the mole or more, preferably 2 to 4 times the mole. 1. Caustic potash is used as the hydrolysis reagent, preferably in pulverized form. The amount of caustic potash used is 4 times or more, preferably about 6 to 10 times the mole of DCBTF. The most important thing in the method of the present invention is to add caustic potassium into the above co-solvent, and while maintaining the reaction temperature, the raw material I)
CBTF? There is a little T' to add. By doing this, it is possible to reduce the amount of triflumermethyl group, which is common to this compound, at a relatively high temperature and for a short time! lv can be suppressed, the reaction time can be significantly shortened, and the yield of the present compound can be maximized. In the method of the present invention, the reaction temperature is 300 to 130°C, more preferably 505 to 120°C. The reaction time needs to be carried out at a relatively high temperature and for a short time, ie in the range from 0.5 to 4 hours, preferably from about 1 hour to about 2 hours. By strictly applying the conditions stipulated in the method of the present invention, 1. The present compound can be produced at a per-section ratio of 90% or more, and in a method that is advantageous both industrially and economically. . When the method of the present invention is carried out under an inert gas atmosphere,
The reaction product itself is preferably subjected to neutralization, extraction, steaming, etc., since the coloring property of the obtained compound is significantly improved. The process of the present invention can be carried out in either a batch reactor or a continuous reactor. Next, the present invention will be explained in more detail with reference to Examples. Example 1 Dimethyl sulfoxide (hereinafter abbreviated as DMSO) JO-1 t-butyl alcohol 1.6 W (2
1,6 mmot), crushed caustic potash 2.5 f (45 m
To the mixture, 4.65 mmol of DCBTF J y was added dropwise to the mixture while heating it in a hot water bath at 12°C to 22°C, and the reaction was continued for 1 hour. When the extract was extracted twice and analyzed by gas chromatography (5% FFAP column (manufactured by Nippon Gascro Industries Co., Ltd., 380°C), DCBTF disappeared and the target compound was found to be 0839 (4,22 mmot).
) (yield: 90 cm). Example 2 In a 250-mil flask equipped with a stirrer and a navy blue condenser, 1 ml of DMSOJOO, 1 t-butyl alcohol was added.
5.8 f (0,2 J mot) and crushed caustic potash 20 f (0,35 mot)' in a stream of nitrogen.
Heating and stirring at 0 to 125°C, DCBTF J O
f(46,5mmo7)'fH was reacted dropwise, and the reaction time was 65 minutes. After the reaction was completed, it was poured into 6N hydrochloric acid and ice, the oil layer was completely separated, and further extracted four times with ether 40me. Anhydrous sodium sulfate was added to the extract, and after dehydration, the ether was distilled off, and the remaining liquid was distilled under reduced pressure (16 nm). Boiling point 65-7 J °C/J 6mHg'7) Distillation 7.8
t (yield: 86 cm) was obtained. DMSO and 0.3 f (3.2%) of the present compound further remained in the bottom of the pot. Example 3 Similar to Example 1, caustic potash 2F (30 mmot)
The reaction temperature was varied within the range of 90 to 145°C. The results were as shown in Table 1 below.
Ll 1 88-90 582
J05~106 893]20~12
3 9) 4 128-130 8 85
145-347 6 7 Meishiori 4 t-7'f-ru alcohol k DCB'I'F vCK
An experiment was carried out in the same manner as in Example 1, except that the amount was varied in the range of 1 to 8 times the mole. The results are shown in Table 2 below. Table 2 422
2 88 3 4 91 4 8 90 Actual IM 5 The experiment was repeated as in full' except that the molar ratio of caustic potash to -J- to L) e B TF was determined. The results were as shown in Table 3. Table 3, l 1.8 5] 2 3.6 73 : 3 5.4 91 49.0 89 Example 6 The reaction time was 30 minutes, 1, 2, and 4.8 hours. The experiment was conducted in the same manner as J. The results were as shown in Table 4 below. 4 1 30 minutes 72 2 1 hour 90 3 211i [eye] 87 4 4 hours 61 5 8:10J 17

Claims (1)

【特許請求の範囲】[Claims] 1、不活性な非プロトン溶媒お工び脂肪族3級アルコー
ルエリ成る共溶媒中に苛性力1ノを存在せしめ、これに
300〜330℃の温度範四で、3.4−ジクロルペン
シトリフルオライドる方法にL930分〜4時間反応さ
せることを特徴とする2−クロル−4−トリフルオルメ
チルフェノール
1. In an inert aprotic solvent, a co-solvent consisting of an aliphatic tertiary alcohol is present at a level of caustic strength, and 3,4-dichloropene cytrifluoride is added to this at a temperature range of 300 to 330°C. 2-chloro-4-trifluoromethylphenol, which is characterized in that it is reacted for 30 minutes to 4 hours according to the method of reaction.
JP58013916A 1983-01-31 1983-01-31 Production of trifluoromethylphenol Pending JPS59139336A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58013916A JPS59139336A (en) 1983-01-31 1983-01-31 Production of trifluoromethylphenol

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58013916A JPS59139336A (en) 1983-01-31 1983-01-31 Production of trifluoromethylphenol

Publications (1)

Publication Number Publication Date
JPS59139336A true JPS59139336A (en) 1984-08-10

Family

ID=11846489

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58013916A Pending JPS59139336A (en) 1983-01-31 1983-01-31 Production of trifluoromethylphenol

Country Status (1)

Country Link
JP (1) JPS59139336A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103910609A (en) * 2014-04-10 2014-07-09 安徽海华科技股份有限公司 Method for synthesizing cresol

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103910609A (en) * 2014-04-10 2014-07-09 安徽海华科技股份有限公司 Method for synthesizing cresol
CN103910609B (en) * 2014-04-10 2015-09-30 安徽海华科技股份有限公司 A kind of synthetic method of cresols

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