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JPH0528692B2 - - Google Patents
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JPH0528692B2 - - Google Patents

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Publication number
JPH0528692B2
JPH0528692B2 JP60008848A JP884885A JPH0528692B2 JP H0528692 B2 JPH0528692 B2 JP H0528692B2 JP 60008848 A JP60008848 A JP 60008848A JP 884885 A JP884885 A JP 884885A JP H0528692 B2 JPH0528692 B2 JP H0528692B2
Authority
JP
Japan
Prior art keywords
compound
general formula
compound represented
acid
following general
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.)
Expired - Lifetime
Application number
JP60008848A
Other languages
Japanese (ja)
Other versions
JPS61167636A (en
Inventor
Terutaka Yao
Ryoji Sato
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.)
Zeon Corp
Original Assignee
Nippon Zeon Co Ltd
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 Nippon Zeon Co Ltd filed Critical Nippon Zeon Co Ltd
Priority to JP884885A priority Critical patent/JPS61167636A/en
Publication of JPS61167636A publication Critical patent/JPS61167636A/en
Publication of JPH0528692B2 publication Critical patent/JPH0528692B2/ja
Granted legal-status Critical Current

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  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明はビシナルジケトン化合物の新規な製造
法に関し、さらに詳しくは、下記一般式〔〕で
表わされるジハロアルカノン化合物を原料とし下
記一般式〔〕で表わされるジアルコキシアルカ
ノン化合物を経由して下記一般式〔〕で表わさ
れるビシナルジケトン化合物を製造する方法に関
する。
Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a novel method for producing a vicinal diketone compound, and more specifically, the present invention relates to a novel method for producing a vicinal diketone compound, and more specifically, a method for producing a vicinal diketone compound using a dihaloalkanone compound represented by the following general formula [] as a raw material. The present invention relates to a method for producing a vicinal diketone compound represented by the following general formula [] via a dialkoxyalkanone compound.

(式中、R1,R2及びR3は同種または異種の低
級アルキル基、Xはハロゲン原子を表わす。) (従来の技術) ジアセチルに代表される上記一般式〔〕で示
されるビシナルジケトン化合物は食品添加物や工
業的原料として有用な物質である。
(In the formula, R 1 , R 2 and R 3 are the same or different lower alkyl groups, and X represents a halogen atom.) (Prior art) The vicinal diketone compound represented by the above general formula [ ] represented by diacetyl is It is a useful substance as a food additive and industrial raw material.

かかるビシナルジケトン化合物の製造法とし
て、例えば2,3−ブタンジオールを酸化する方
法(特開昭55−36467号など)、メチルエチルケト
ンを酸化する方法(特開昭54−132515号など)な
どが知られているが、本発明者らはこれらの方法
とは異なる新規な合成法を開発すべく鋭意検討の
結果、上記一般式〔〕で表わされるジハロアル
カノン化合物を出発物質とすることにより効率よ
く上記一般式〔〕で表わされるビシナルジケト
ン化合物を製造し得る方法を見出し、本発明を完
成するに到つた。
Known methods for producing such vicinal diketone compounds include, for example, a method of oxidizing 2,3-butanediol (Japanese Patent Application Laid-Open No. 55-36467, etc.), a method of oxidizing methyl ethyl ketone (Japanese Patent Application Laid-Open No. 54-132515, etc.). However, as a result of intensive studies to develop a new synthetic method different from these methods, the present inventors have found that by using a dihaloalkanone compound represented by the above general formula [] as a starting material, the above general formula [] can be efficiently synthesized. The present inventors have discovered a method for producing the vicinal diketone compound represented by the following formula, and have completed the present invention.

(問題点を解決するための手段) かくして本発明によれば、下記一般式〔〕で
表わされるジハロアルカノン化合物をアルコール
性アルカリ金属化合物と反応させて下記一般式
〔〕で表わされるジアルコキシアルカノン化合
物を形成せしめたのち、酸の存在下に水と接触さ
せることを特徴とする下記一般式〔〕で表わさ
れるビシナルジケトン化合物の製造法 (式中、R1,R2及びR3は同種または異種の低
級アルキル基、Xはハロゲン原子を表わす)が提
供される。
(Means for Solving the Problems) Thus, according to the present invention, a dialkoxyalkanone compound represented by the following general formula [] is produced by reacting a dihaloalkanone compound represented by the following general formula [] with an alcoholic alkali metal compound. A method for producing a vicinal diketone compound represented by the following general formula [], which comprises forming a vicinal diketone compound, and then contacting the compound with water in the presence of an acid. (wherein R 1 , R 2 and R 3 are the same or different lower alkyl groups, and X represents a halogen atom).

本発明においては、まず上記一般式〔〕で表
わされるジハロアルカノン化合物とアルコール性
アルカリ金属化合物とから上記一般式〔〕で表
わされるジアルコキシアルカノン化合物が形成さ
れる。
In the present invention, first, a dialkoxyalkanone compound represented by the above general formula [] is formed from a dihaloalkanone compound represented by the above general formula [] and an alcoholic alkali metal compound.

原料として用いられるジハロアルカノン化合物
の具体例としては、例えば3,3−ジクロロブタ
ノン、3,3−ジブロモブタノン、3,3−ジク
ロロペンタノンなどが挙げられ、とくに3,3−
ジクロロブタノンが賞用される。
Specific examples of dihaloalkanone compounds used as raw materials include 3,3-dichlorobutanone, 3,3-dibromobutanone, 3,3-dichloropentanone, and especially 3,3-dichlorobutanone.
Dichlorobutanone is preferred.

一方、反応に用いられるアルコール性アルカリ
金属化合物はアルカリ金属アルコラートのほか、
アルコールに溶解したアルカリ金属化合物をさ
し、その具体例としてナトリウムメチラート、ナ
トリウムエチラート、カリウムメチラート、水酸
化ナトリウム、水酸化カリウム、炭酸ナトリウ
ム、炭酸カリウムなどが例示される。
On the other hand, the alcoholic alkali metal compounds used in the reaction include alkali metal alcoholates,
It refers to an alkali metal compound dissolved in alcohol, and specific examples thereof include sodium methylate, sodium ethylate, potassium methylate, sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, and the like.

アルカリ金属化合物を溶解するために用いられ
るアルコールの具体例としては、メタノール、エ
タノール、イソプロピルアルコールなどが例示さ
れる。
Specific examples of alcohol used to dissolve the alkali metal compound include methanol, ethanol, and isopropyl alcohol.

合成反応における反応温度は通常−10℃〜100
℃、好ましくは0〜70℃、反応圧力は0.5〜10気
圧、好ましくは1〜3気圧から選ばれ、原料とし
てのジハロアルカノン化合物の沸点を勘案して適
宜決定される。原料としてのジハロアルカノン化
合物1モルを基準とした場合、アルコール性アル
カリ金属化合物の使用量は通常1〜10モル、好ま
しくは1.5〜4モルである。
The reaction temperature in the synthesis reaction is usually -10°C to 100°C.
The reaction pressure is selected from 0.5 to 10 atm, preferably 1 to 3 atm, and is appropriately determined in consideration of the boiling point of the dihaloalkanone compound as a raw material. The amount of the alcoholic alkali metal compound used is usually 1 to 10 mol, preferably 1.5 to 4 mol, based on 1 mol of the dihaloalkanone compound as a raw material.

反応は一般にアルコールの存在下に実施され
る。用いられるアルコールはアルカリ金属化合物
を可溶化するために用いられるものと同一範ちゆ
うのものでよい。
The reaction is generally carried out in the presence of alcohol. The alcohol used may be in the same range as those used to solubilize alkali metal compounds.

また反応の形式はとくに限定されるものではな
く、ジハロアルカノン化合物にアルコール性アル
カリ金属化合物を添加する方法であつても、その
逆の方法であつてもよい。
Furthermore, the reaction format is not particularly limited, and may be a method of adding an alcoholic alkali metal compound to a dihaloalkanone compound, or the reverse method.

反応の途上において経時的に無機塩類の析出を
見るようなことがあつても反応にはとくに悪影響
は見られないが、撹拌等に操作上の支障が生じな
いようにする必要がある。
Even if inorganic salts are precipitated over time during the course of the reaction, there will be no particular adverse effect on the reaction, but it is necessary to ensure that stirring and other operations are not hindered.

本発明においては、かくして合成されたジアル
コキシアルカノン化合物を酸の存在下に水と接触
させることによつて目的とするビシナルジケトン
化合物が形成される。
In the present invention, the desired vicinal diketone compound is formed by contacting the dialkoxyalkanone compound thus synthesized with water in the presence of an acid.

用いられる酸の具体例としては、塩酸、硫酸、
リン酸、硝酸、硼酸、ヘテロポリ酸等の無機酸、
p−トルエンスルホン酸、酢酸等の有機酸が挙げ
られ、これらは通常、5〜30重量%の水溶液とし
て用いられる。また強酸型陽イオン交換樹脂のよ
うな固体酸を用いることもできる。
Specific examples of acids used include hydrochloric acid, sulfuric acid,
Inorganic acids such as phosphoric acid, nitric acid, boric acid, heteropolyacids,
Examples include organic acids such as p-toluenesulfonic acid and acetic acid, which are usually used as a 5 to 30% by weight aqueous solution. Further, a solid acid such as a strong acid type cation exchange resin can also be used.

酸の使用量はジアルコキシアルカノン化合物1
モルを基準とした場合、通常0.05〜5モル、好ま
しくは0.1〜1モルの範囲で選択される。酸の水
溶液を用いる場合には改めて水を供給する必要は
ないが、無水の酸を用いる場合には少量の水を共
存させる必要がある。
The amount of acid used is dialkoxyalkanone compound 1
On a mole basis, it is usually selected in the range of 0.05 to 5 moles, preferably 0.1 to 1 mole. When using an aqueous acid solution, there is no need to supply water again, but when using an anhydrous acid, it is necessary to coexist a small amount of water.

この処理における温度は、通常0〜100℃、好
ましくは20〜60℃、圧力は0.5〜10気圧、好まし
くは1〜3気圧から選ばれ、ジアルコキシアルカ
ノン化合物に酸の水溶液を添加することにより、
あるいは強酸型陽イオン交換樹脂のような固体酸
を充填した充填塔にジアルコキシアルカノン化合
物を水ととも連続的に通過させることにより、目
的とするビシナルジケトン化合物が形成される。
The temperature in this treatment is usually selected from 0 to 100°C, preferably 20 to 60°C, and the pressure is selected from 0.5 to 10 atm, preferably 1 to 3 atm. ,
Alternatively, the desired vicinal diketone compound is formed by continuously passing the dialkoxyalkanone compound together with water through a packed column filled with a solid acid such as a strong acid type cation exchange resin.

このようにして形成されたビシナルジケトン化
合物はアルコールを留去後、蒸留によつて得られ
るが、加水分解を行う前に予めアルコールを大気
圧下又は減圧下で留去しておくことがビシナルジ
ケトン化合物の純度を高めるうえで好ましい。
The vicinal diketone compound thus formed can be obtained by distillation after distilling off the alcohol, but it is recommended that the alcohol be distilled off under atmospheric pressure or reduced pressure before hydrolysis. Preferable for increasing purity.

(発明の効果) かくして本発明によれば、前記一般式〔〕で
表わされるビシナルジケトン化合物の合成に関
し、極めて容易で実用性のある方法が提供され
る。
(Effects of the Invention) Thus, according to the present invention, an extremely easy and practical method for synthesizing the vicinal diketone compound represented by the general formula [] is provided.

(実施例) 以下に実施例によつてさらに本発明の内容を説
明する。なお、実施例中の部及び%はとくに付言
しない限り重量基準である。
(Example) The content of the present invention will be further explained below with reference to Examples. Note that parts and percentages in the examples are based on weight unless otherwise specified.

実施例 1 (1) 3,3−ジメトキシ−2−ブタノンの合成 3,3−ジメトキシ−2−ブタノン141部とメ
タノール700部とを撹拌機および冷却還流器つき
の四つ口フラスコに入れ、温浴中に浸し、内容物
の温度40℃の状態で撹拌しながら、ナトリウムメ
チラートの10%メタノール溶液1100部を2時間か
けて添加し、添加終了後も同じ温度で30分間撹拌
を行つた。撹拌終了後、反応液を100mmHgの減圧
で過して析出した塩化ナトリウムを取り除い
た。
Example 1 (1) Synthesis of 3,3-dimethoxy-2-butanone 141 parts of 3,3-dimethoxy-2-butanone and 700 parts of methanol were placed in a four-neck flask equipped with a stirrer and a cooling reflux device, and placed in a hot bath. 1100 parts of a 10% methanol solution of sodium methylate was added over 2 hours while stirring at a temperature of 40° C. After the addition was complete, stirring was continued at the same temperature for 30 minutes. After the stirring was completed, the reaction solution was filtered under reduced pressure of 100 mmHg to remove precipitated sodium chloride.

液をガスクロマトグラフにより分析した結
果、液中に112部(モル収率85%)の3,3−
ジメトキシ−2−ブタノンが生成しており、未反
応の3,3−ジクロル−2−ブタノンは痕跡程度
であることがわかつた。
As a result of analyzing the liquid by gas chromatography, it was found that 112 parts (molar yield 85%) of 3,3-
It was found that dimethoxy-2-butanone had been produced and that unreacted 3,3-dichloro-2-butanone was only a trace.

次にこの液を大気圧下に80〜90℃の温度で加
熱し、液からメタノールを1600部回収し、液
を濃縮した。濃縮液にはメタノールに溶解してい
た塩化ナトリウムが析出したのでデカンテーシヨ
ンして溶液部分を次の加水分解反応に供した。
Next, this liquid was heated at a temperature of 80 to 90°C under atmospheric pressure, 1600 parts of methanol was recovered from the liquid, and the liquid was concentrated. Sodium chloride, which had been dissolved in methanol, precipitated in the concentrated solution, so it was decanted and the solution portion was subjected to the next hydrolysis reaction.

(2) ジアセチルの合成 112部の3,3−ジメトキシ−2−ブタノンを
含む濃縮液(約220部)を撹拌機および冷却還流
器つきの四つ口フラスコに入れ、温浴中に浸し、
内容物の温度40℃の状態で撹拌しながら硫酸の15
%水溶液180部を15分間かけて添加し、終了後も、
同じ温度で30分間撹拌を続けた。このときの反応
液のPHは0.7となつた。
(2) Synthesis of diacetyl A concentrated solution (approximately 220 parts) containing 112 parts of 3,3-dimethoxy-2-butanone was placed in a four-necked flask equipped with a stirrer and a cooling reflux device, and immersed in a hot bath.
15 of sulfuric acid while stirring with the contents at a temperature of 40°C.
% aqueous solution was added over 15 minutes, and even after the addition,
Stirring was continued for 30 minutes at the same temperature. At this time, the pH of the reaction solution was 0.7.

反応液をガスクロマトグラフで分析したとこ
ろ、反応液中に73部のジアセチルが生成してお
り、加水分解によりジメトキシブタノンからジア
セチルがほぼ定量的に生成していることがわかつ
た。
When the reaction solution was analyzed by gas chromatography, it was found that 73 parts of diacetyl was produced in the reaction solution, indicating that diacetyl was produced almost quantitatively from dimethoxybutanone through hydrolysis.

実施例 2 実施例1で用いたナトリウムメチラートのメタ
ノール溶液にかえて、水酸化ナトリウムの7.4%
メタノール溶液1100部を用いること以外は実施例
1と同様にして反応を行い、ガスクロマトグラフ
で分析した結果、3,3−ジメトキシ−2−ブタ
ノンのモル収率は82%であり、ジメトキシブタノ
ンからジアセチルへの反応はほぼ定量的であるこ
とがわかつた。
Example 2 Instead of the methanol solution of sodium methylate used in Example 1, 7.4% sodium hydroxide was used.
The reaction was carried out in the same manner as in Example 1 except that 1100 parts of methanol solution was used, and as a result of gas chromatograph analysis, the molar yield of 3,3-dimethoxy-2-butanone was 82%, and diacetyl was converted from dimethoxybutanone. The response was found to be almost quantitative.

Claims (1)

【特許請求の範囲】 1 下記一般式〔〕で表わされるジハロアルカ
ノン化合物をアルコール性アルカリ金属化合物と
反応させて下記一般式〔〕で表わされるジアル
コキシアルカノン化合物を形成せしめたのち、酸
の存在下に水と接触させることを特徴とする下記
一般式〔〕で表わされるビシナルジケトン化合
物の製造法。 (式中、R1,R2及びR3は同種または異種の低
級アルキル基、Xはハロゲン原子を表わす)
[Claims] 1. A dihaloalkanone compound represented by the following general formula [] is reacted with an alcoholic alkali metal compound to form a dialkoxyalkanone compound represented by the following general formula [], and then in the presence of an acid. A method for producing a vicinal diketone compound represented by the following general formula [], which comprises bringing the compound into contact with water. (In the formula, R 1 , R 2 and R 3 are the same or different lower alkyl groups, and X represents a halogen atom)
JP884885A 1985-01-21 1985-01-21 Production of vicinal diketone compound Granted JPS61167636A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP884885A JPS61167636A (en) 1985-01-21 1985-01-21 Production of vicinal diketone compound

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP884885A JPS61167636A (en) 1985-01-21 1985-01-21 Production of vicinal diketone compound

Publications (2)

Publication Number Publication Date
JPS61167636A JPS61167636A (en) 1986-07-29
JPH0528692B2 true JPH0528692B2 (en) 1993-04-27

Family

ID=11704164

Family Applications (1)

Application Number Title Priority Date Filing Date
JP884885A Granted JPS61167636A (en) 1985-01-21 1985-01-21 Production of vicinal diketone compound

Country Status (1)

Country Link
JP (1) JPS61167636A (en)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54132515A (en) * 1978-04-07 1979-10-15 Mitsubishi Chem Ind Ltd Preparation of alpha-diketone

Also Published As

Publication number Publication date
JPS61167636A (en) 1986-07-29

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