JP4228571B2 - Method for producing aromatic aldehyde - Google Patents

Method for producing aromatic aldehyde Download PDF

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Publication number
JP4228571B2
JP4228571B2 JP2001381113A JP2001381113A JP4228571B2 JP 4228571 B2 JP4228571 B2 JP 4228571B2 JP 2001381113 A JP2001381113 A JP 2001381113A JP 2001381113 A JP2001381113 A JP 2001381113A JP 4228571 B2 JP4228571 B2 JP 4228571B2
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reaction mixture
mass
aromatic
phosgene
parts
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JP2003183268A (en
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勝 鴨田
浩二 矢野
浩之 市田
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Sumitomo Chemical Co Ltd
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Sumitomo Chemical Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、芳香族アルデヒドの製造方法に関する。
【0002】
【従来の技術】
式(I)

Figure 0004228571
〔式中、R1、R2およびR3はそれぞれ独立に水素原子またはアルキル基を示し、Xは酸素原子または硫黄原子を示す。〕
で示される芳香族アルデヒドは、農薬、医薬、香料などの中間体として有用である。かかる芳香族アルデヒド(I)の製造方法としては、溶媒中で式(II)
Figure 0004228571
〔式中、R1、R2、R3およびXはそれぞれ前記と同じ意味を示す。〕
で示される芳香族化合物、N,N−ジメチルホルムアミドおよびホスゲンを反応させた後、加水分解する方法が知られており、加水分解後の反応混合物を精留することで、留分として目的の芳香族アルデヒド(I)を取出す方法も知られている。特開昭57−91982号公報には、1,2−ジクロロエタン中で2−メチルフラン、N,N−ジメチルホルムアミドおよびホスゲンを反応させたのち加水分解して得た反応混合物を精留して、留分として5−メチルフルフラールを取り出した旨が記載されている。
【0003】
しかし、かかる従来の製造方法では、精留に際して多くのタール成分が生成して、目的とする芳香族アルデヒド(I)の取出し収率が低くなるという問題があった。
【0004】
【発明が解決しようとする課題】
そこで本発明者は、溶媒中で芳香族化合物(II)、N,N−ジメチルホルムアミドおよびホスゲンを反応させたのち加水分解して得られた反応混合物から、タール成分を殆んど生成させることなく精留して、留分として芳香族アルデヒド(I)を収率よく得ることのできる製造方法を開発するべく鋭意検討した結果、溶媒としてハロゲン化芳香族炭化水素を用いて反応させたのち加水分解して得た反応混合物は、これを精留してもタール成分が殆んど生成せず、芳香族アルデヒド(I)の取出し収率が向上することを見出し、本発明に至った。
【0005】
【課題を解決するための手段】
すなわち本発明は、ハロゲン化芳香族炭化水素中で前記式(II)(但し、式中Xは酸素原子を示す)で示される芳香族化合物、N,N−ジメチルホルムアミドおよびホスゲンを反応させたのち加水分解して得た反応混合物を精留して、留分として式(I)(但し、式中Xは酸素原子を示す)で示される芳香族アルデヒドを得ることを特徴とする前記芳香族アルデヒドの製造方法を提供するものである。
【0006】
【発明の実施の形態】
本発明に適用される反応混合物は、ハロゲン化芳香族炭化水素中で芳香族化合物(II)、N,N−ジメチルホルムアミドおよびホスゲンを反応させたのち加水分解することによって得られた反応混合物である。
【0007】
ハロゲン化芳香族炭化水素としては、例えばモノフルオロベンゼン、ジフルオロベンゼンなどのフッ化芳香族炭化水素、モノクロロベンゼン、ジクロロベンゼンなどの塩素化芳香族炭化水素、モノブロモベンゼン、ジブロモベンゼンの臭素化芳香族炭化水素などが挙げられ、容易に入手できる点で塩素化芳香族炭化水素、さらにはモノクロロベンゼンが好ましい。ハロゲン化芳香族炭化水素の使用量は、芳香族化合物(II)1質量部あたり通常は1質量部以上10質量部以下である。
【0008】
式(II)で示される芳香族化合物において、R1、R2およびR3におけるアルキル基としては、例えばメチル基、エチル基、n−プロピル基、イソプロピル基、n−ブチル基、イソブチル基、t−ブチル基などの炭素数1〜5程度のアルキル基などが挙げられる。
【0009】
かかる芳香族化合物(II)としては、例えばフラン、2−メチルフラン、2−エチルフラン、2−プロピルフラン、2−ブチルフラン、3−メチルフラン、3−エチルフラン、3−プロピルフラン、3−ブチルフラン、4−メチルフラン、4−エチルフラン、4−プロピルフラン、4−ブチルフラン、2,3−ジメチルフラン、2,3−ジエチルフラン、2,4−ジメチルフラン、2,4−ジエチルフラン、3,4−ジメチルフラン、3,4−ジエチルフラン、2,3,4−トリメチルフラン、2,3,4−トリエチルフランなどが挙げられる。
【0011】
N,N−ジメチルホルムアミドの使用量は芳香族化合物(II)1モルあたり通常は1モル以上であり、好ましくは1.5モル以下、さらに好ましくは1.1モル以下程度である。ホスゲンの使用量は芳香族化合物(II)1モルあたり通常は1モル以上であるが、好ましくは1.1モル以上であり、好ましくは1.5モル以下、更に好ましくは1.2モル以下程度である。
【0012】
ハロゲン化芳香族炭化水素中で芳香族化合物(II)、N,N−ジメチルホルムアミドおよびホスゲンを反応させるには、ハロゲン化芳香族炭化水素中でこれらを混合すればよく、例えばハロゲン化芳香族炭化水素中で芳香族化合物(II)およびN,N−ジメチルホルムアミドを混合したのちホスゲンを吹き込みながら反応させてもよいし、ハロゲン化芳香族炭化水素中でN,N−ジメチルホルムアミドおよびホスゲンを混合した後に芳香族化合物(II)を加えることにより反応させてもよい。また目的とする芳香族アルデヒド(I)の反応収率の点で、ハロゲン化芳香族炭化水素に芳香族化合物(II)、N,N−ジメチルホルムアミドおよびホスゲンを同時に供給しながら反応させることが好ましい。反応温度は通常0℃以上90℃以下であり、好ましくは10℃以上50℃以下である。反応温度で、芳香族化合物(II)、N,N−ジメチルホルムアミドおよびホスゲンを混合することで、芳香族化合物(II)、N,N−ジメチルホルムアミドおよびホスゲンが反応する。
【0013】
次いで、加水分解する。加水分解するには、通常は反応後の反応混合物を水と接触させればよく、具体的には反応後の反応混合物に水を加えればよい。水の使用量は、反応混合物1質量部あたり通常0.2質量部以上1質量部以下である。水として水酸化ナトリウム水溶液、水酸化カリウム水溶液などのアルカリ水溶液を用いることもできる。加水分解温度は、通常30℃以上50℃以下程度である。
【0014】
加水分解に用いた水は通常、加水分解後、反応混合物から除去する。本発明の製造方法では、先の反応でハロゲン化芳香族炭化水素を用いるので、加水分解後の反応混合物と加水分解に用いた水とは通常、有機層と水層との2層に層分離する。このため、通常の分液操作によって、反応混合物から水を分離することができる。分離された水には芳香族アルデヒド(I)が含まれることもあるが、かかる芳香族アルデヒド(I)は、疎水性有機溶媒、例えば上記したと同様のハロゲン化芳香族炭化水素などを抽出溶媒として抽出することで容易に回収することができる。回収された芳香族アルデヒド(I)は、抽出溶媒と共に加水分解後の反応混合物に加えてもよい。
【0015】
かくして得られた反応混合物は、酸性水溶液で洗浄することが好ましい。酸性水溶液としては、例えば塩酸(塩化水素の水溶液)、硫酸水溶液などが用いられる。酸性水溶液に塩化ナトリウム、硫酸ナトリウムなどの強電解質を加えておくと、芳香族アルデヒド(I)の酸性水溶液への溶解を抑制できて、好ましい。
【0016】
本発明の製造方法では、かくして得られた反応混合物を精留して、留分として芳香族アルデヒド(I)を得る。
【0017】
加水分解して得られた反応混合物には、既にタール成分が存在することもあるが、かかるタール成分は予め除去しておくことが好ましい。反応混合物からタール成分を除去するには、例えば反応混合物を蒸留すればよい。蒸留により、反応混合物を留分として得ることにより、タール成分を残渣として除去することができる。
【0018】
精留は、通常と同様に沸点により留出成分を分画することで行なわれる。精留に際して、反応で用いたハロゲン化芳香族炭化水素の沸点が芳香族アルデヒド(I)の沸点よりも低い場合には、先ずハロゲン化芳香族炭化水素が留出し、その後に芳香族アルデヒド(I)が留出する。
【0019】
精留は、減圧下に行なわれることが、タール成分の生成がより少なくなる点で好ましく、例えば芳香族アルデヒド(I)は、30kPa以下、好ましくは3kPa以下の圧力下で通常110℃以下、好ましくは100℃以下の温度で留出させることが好ましい。
【0020】
かくして得られる芳香族アルデヒド(I)としては、例えばフルフラール、5−メチルフルフラール、5−エチルフルフラール、5−プロピルフルフラール、5−ブチルフルフラール、4−メチルフルフラール、4−エチルフルフラール、4−プロピルフルフラール、4−ブチルフルフラール、3−メチルフルフラール、3−エチルフルフラール、3−プロピルフルフラール、3−ブチルフルフラール、4,5−ジメチルフルフラール、4,5−ジエチルフルフラール、3,5−ジメチルフルフラール、3,5−ジエチルフルフラールチオフナール、3,4−ジメチルフルフラール、3,4−ジエチルフルフラールチオフナール、3,4,5−トリメチルフルフラール、3,4,5−トリエチルフルフラールなどが挙げられる。
【0022】
【発明の効果】
本発明の製造方法によれば、芳香族化合物(II)、N,N−ジメチルホルムアミドおよびホスゲンを反応させたのち加水分解して得た反応混合物から、タール成分を殆んど生ずることなく、精留により、留分として芳香族アルデヒド(I)を得ることができる。
【0023】
【実施例】
以下、実施例により本発明をより詳細に説明するが、本発明はかかる実施例により限定されるものではない。
【0024】
実施例1
〔2−メチルフラン、N,N−ジメチルホルムアミドおよびホスゲンの反応〕
モノクロロベンゼン(312質量部)に、減圧下(約−4.5〜−2.5kPa(ゲージ読み圧力))で35℃〜45℃の温度を保ち攪拌しながら、2−メチルフラン、N,N−ジメチルホルムアミドおよびホスゲンの供給を開始し、12時間かけて2−メチルフラン132質量部およびN,N−ジメチルホルムアミド123.4質量部をそれぞれ滴下して供給すると同時に、13時間かけてホスゲン182.4質量部を吹き込んだ。ホスゲンの供給を停止したのち、更に同圧力下、同温度範囲で1時間攪拌して反応混合物を得た。
【0025】
〔加水分解〕
上記で得た反応混合物を攪拌しながら同圧力範囲、同温度範囲で1.5時間かけて水(約230質量部)を加えたのち、攪拌しながら同圧力範囲、同温度範囲を10分間保持し、次いで同圧力下、同温度範囲で5.5時間かけて25%水酸化ナトリウム水溶液(100質量部中に水酸化ナトリウム25質量部を含む、約330質量部)を加え、同圧力下、同温度範囲で攪拌しながら同圧力範囲、同温度範囲を10分間保持して加水分解した。その後、大気圧下、同温度範囲で静置し、分液して、有機層としての反応混合物と、水層とを得た。得られた水層にモノクロロベンゼン(約250質量部)を加え、攪拌後、静置し、分液して有機層を得、得られた有機層を先に得た反応混合物に加えた。
【0026】
〔反応混合物の洗浄〕
上記で得た反応混合物に5%硫酸ナトリウム水溶液(100質量部中に硫酸ナトリウム5質量部を含む)約90質量部および20%塩酸(100質量部中に塩化水素20質量部を含む)約11質量部を加え、攪拌後、静置し、分液して水層を除去し、5%硫酸ナトリウム水溶液(約100質量部)を加えて攪拌後、静置し、分液して、水層を除去し、更に5%硫酸ナトリウム水溶液(約100質量部)を加えて攪拌後、静置し、分液して水層を除去して洗浄した。洗浄後の反応混合物には、171.2質量部の5−メチルフルフラールが含まれていた。
【0027】
〔蒸留〕
上記で洗浄した後の反応混合物を蒸留して、65Torr(約8.6kPa)で85℃の留分として反応混合物を得て、タール成分を除去した。
【0028】
〔精留〕
上記で得た反応混合物を蒸留して30Torr(約3.9kPa)で43℃の留分(主成分はモノクロロベンゼン)を留去したのち、30Torr(約3.9kPa)で43℃の留分(主成分はモノクロロベンゼン)を留去した。次いで20Torr(約2.6kPa)で95℃の留分として5−メチルフルフラール168質量部を得た(取出し収率は98%)。なお、5−メチルフルフラールを得たのちの残渣(タール成分)は、約0.242質量部であった。
【0029】
比較例1
〔反応〕
減圧下(約−4.5〜−2.5kPa(ゲージ読み圧力))で35℃〜45℃の温度を保ち攪拌しながら、1,2−ジクロロエタン(353質量部)、2−メチルフラン(130質量部)およびN,N−ジメチルホルムアミド(123.4質量部)を混合し、次いで同圧力下、同温度範囲でホスゲン(182質量部)を13時間かけて吹き込んで反応させた。ホスゲンの供給を停止したのち、更に同圧力下、同温度範囲で45分間攪拌して反応混合物を得た。
【0030】
〔加水分解〕
実施例1で得た反応混合物に代えて、上記で得た反応混合物を用いる以外は実施例1と同様に操作して加水分解し、静置し、分液して、有機層としての反応混合物と水層とを得た。得られた水層に1,2−ジクロロエタン(280質量部)を加え、攪拌後、静置し、分液して有機層を得、得られた有機層を先に得た反応混合物に加えた。
【0031】
〔反応混合物の洗浄〕
実施例1で加水分解して得た反応混合物に代えて、上記で得た反応混合物を用いる以外は実施例1と同様に操作して、洗浄した。洗浄後の反応混合物には、166.4質量部の5−メチルフルフラールが含まれていた。
【0032】
〔蒸留〕
上記で得た反応混合物を蒸留して、230Torr(約30kPa)で110℃の留分として反応混合物を得て、タール成分を除去した。
【0033】
〔精留〕
上記で得た反応混合物を精留して150Torr(約20kPa)で50℃の留分(主成分は1,2−ジクロロエタンおよびモノクロロベンゼン)を留去したのち、50Torr(約6.6kPa)で30℃の留分(主成分は1,2−ジクロロエタンおよびモノクロロベンゼン)を留去した。次いで20Torr(約2.6kPa)で95℃の留分として、5−メチルフルフラール150質量部を得た(取出し収率は90%)。なお、5−メチルフルフラールを得たのちの残渣(タール成分)は、5.1質量部であった。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing an aromatic aldehyde.
[0002]
[Prior art]
Formula (I)
Figure 0004228571
[Wherein, R 1 , R 2 and R 3 each independently represents a hydrogen atom or an alkyl group, and X represents an oxygen atom or a sulfur atom. ]
Is useful as an intermediate for agricultural chemicals, medicines, fragrances and the like. Such a method for producing the aromatic aldehyde (I) includes formula (II) in a solvent.
Figure 0004228571
[Wherein R 1 , R 2 , R 3 and X each have the same meaning as described above. ]
A method of hydrolyzing the aromatic compound, N, N-dimethylformamide and phosgene represented by the following formula is known, and the target fragrance is obtained as a fraction by rectifying the reaction mixture after hydrolysis. A method for removing the group aldehyde (I) is also known. JP-A-57-91982 discloses rectifying a reaction mixture obtained by reacting 2-methylfuran, N, N-dimethylformamide and phosgene in 1,2-dichloroethane and then hydrolyzing it. It is described that 5-methylfurfural was taken out as a fraction.
[0003]
However, such a conventional production method has a problem that many tar components are produced during rectification and the yield of the desired aromatic aldehyde (I) is lowered.
[0004]
[Problems to be solved by the invention]
Therefore, the present inventor has produced almost no tar component from the reaction mixture obtained by reacting aromatic compound (II), N, N-dimethylformamide and phosgene in a solvent and then hydrolyzing it. As a result of intensive fractionation to develop a production method capable of obtaining aromatic aldehyde (I) in a high yield as a fraction, hydrolysis was carried out after reaction using a halogenated aromatic hydrocarbon as a solvent. The reaction mixture obtained in this way was found to produce little tar component even when it was rectified, and to improve the yield of the aromatic aldehyde (I), which led to the present invention.
[0005]
[Means for Solving the Problems]
That is, the present invention is a method of reacting an aromatic compound represented by the above formula (II) ( wherein X represents an oxygen atom) , N, N-dimethylformamide and phosgene in a halogenated aromatic hydrocarbon. The reaction mixture obtained by hydrolysis is rectified to obtain an aromatic aldehyde represented by the formula (I) (wherein X represents an oxygen atom ) as a fraction. The manufacturing method of this is provided.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The reaction mixture applied to the present invention is a reaction mixture obtained by reacting an aromatic compound (II), N, N-dimethylformamide and phosgene in a halogenated aromatic hydrocarbon, followed by hydrolysis. .
[0007]
Examples of halogenated aromatic hydrocarbons include fluorinated aromatic hydrocarbons such as monofluorobenzene and difluorobenzene, chlorinated aromatic hydrocarbons such as monochlorobenzene and dichlorobenzene, and brominated aromatics such as monobromobenzene and dibromobenzene. Examples thereof include hydrocarbons, and chlorinated aromatic hydrocarbons and monochlorobenzene are preferred because they are easily available. The amount of the halogenated aromatic hydrocarbon used is usually 1 part by mass or more and 10 parts by mass or less per 1 part by mass of the aromatic compound (II).
[0008]
In the aromatic compound represented by the formula (II), examples of the alkyl group in R 1 , R 2 and R 3 include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, t -Alkyl groups having about 1 to 5 carbon atoms such as a butyl group.
[0009]
Examples of the aromatic compound (II) include furan, 2-methyl furan, 2-ethyl furan, 2-propyl furan, 2-butyl furan, 3-methyl furan, 3-ethyl furan, 3-propyl furan, 3- Butyl furan, 4-methyl furan, 4-ethyl furan, 4-propyl furan, 4-butyl furan, 2,3-dimethyl furan, 2,3-diethyl furan, 2,4-dimethyl furan, 2,4-diethyl furan 3,4-dimethylfuran, 3,4-diethylfuran, 2,3,4-trimethylfuran, 2,3,4-triethylfuran and the like.
[0011]
The amount of N, N-dimethylformamide to be used is usually 1 mol or more, preferably 1.5 mol or less, more preferably about 1.1 mol or less per mol of the aromatic compound (II). The amount of phosgene used is usually 1 mol or more per mol of the aromatic compound (II), preferably 1.1 mol or more, preferably 1.5 mol or less, more preferably about 1.2 mol or less. It is.
[0012]
In order to react the aromatic compound (II), N, N-dimethylformamide and phosgene in the halogenated aromatic hydrocarbon, these may be mixed in the halogenated aromatic hydrocarbon, for example, halogenated aromatic carbonization. After mixing aromatic compound (II) and N, N-dimethylformamide in hydrogen, the reaction may be carried out while blowing phosgene, or N, N-dimethylformamide and phosgene are mixed in halogenated aromatic hydrocarbon. You may make it react by adding aromatic compound (II) later. Moreover, it is preferable to make it react, supplying aromatic compound (II), N, N- dimethylformamide, and phosgene to halogenated aromatic hydrocarbon simultaneously from the point of the reaction yield of the target aromatic aldehyde (I). . The reaction temperature is usually 0 ° C. or higher and 90 ° C. or lower, preferably 10 ° C. or higher and 50 ° C. or lower. The aromatic compound (II), N, N-dimethylformamide and phosgene react by mixing the aromatic compound (II), N, N-dimethylformamide and phosgene at the reaction temperature.
[0013]
It is then hydrolyzed. For hydrolysis, the reaction mixture after the reaction is usually brought into contact with water, and specifically, water may be added to the reaction mixture after the reaction. The amount of water used is usually 0.2 parts by mass or more and 1 part by mass or less per 1 part by mass of the reaction mixture. An aqueous alkali solution such as an aqueous sodium hydroxide solution or an aqueous potassium hydroxide solution can also be used as water. The hydrolysis temperature is usually about 30 ° C. or higher and 50 ° C. or lower.
[0014]
The water used for the hydrolysis is usually removed from the reaction mixture after hydrolysis. In the production method of the present invention, since halogenated aromatic hydrocarbons are used in the previous reaction, the reaction mixture after hydrolysis and the water used for hydrolysis are usually separated into two layers, an organic layer and an aqueous layer. To do. For this reason, water can be separated from the reaction mixture by a normal liquid separation operation. The separated water may contain an aromatic aldehyde (I), and the aromatic aldehyde (I) is extracted from a hydrophobic organic solvent, for example, a halogenated aromatic hydrocarbon similar to that described above. Can be easily recovered. The recovered aromatic aldehyde (I) may be added to the reaction mixture after hydrolysis together with the extraction solvent.
[0015]
The reaction mixture thus obtained is preferably washed with an acidic aqueous solution. As the acidic aqueous solution, for example, hydrochloric acid (aqueous hydrogen chloride solution), sulfuric acid aqueous solution, or the like is used. It is preferable to add a strong electrolyte such as sodium chloride or sodium sulfate to the acidic aqueous solution because dissolution of the aromatic aldehyde (I) in the acidic aqueous solution can be suppressed.
[0016]
In the production method of the present invention, the reaction mixture thus obtained is rectified to obtain aromatic aldehyde (I) as a fraction.
[0017]
Although a tar component may already be present in the reaction mixture obtained by hydrolysis, it is preferable to remove this tar component in advance. In order to remove the tar component from the reaction mixture, for example, the reaction mixture may be distilled. By obtaining the reaction mixture as a fraction by distillation, the tar component can be removed as a residue.
[0018]
The rectification is performed by fractionating the distillate component according to the boiling point as usual. In the rectification, when the boiling point of the halogenated aromatic hydrocarbon used in the reaction is lower than the boiling point of the aromatic aldehyde (I), the halogenated aromatic hydrocarbon is first distilled, and then the aromatic aldehyde (I ) Distills.
[0019]
The rectification is preferably performed under reduced pressure from the viewpoint of less generation of tar components. For example, the aromatic aldehyde (I) is usually 110 ° C. or less at a pressure of 30 kPa or less, preferably 3 kPa or less, preferably Is preferably distilled at a temperature of 100 ° C. or lower.
[0020]
As the aromatic aldehyde (I) thus obtained, for example, furfural, 5-methylfurfural, 5-ethylfurfural, 5-propylfurfural, 5-butylfurfural, 4-methylfurfural, 4-ethylfurfural, 4-propylfurfural, 4-butylfurfural, 3-methylfurfural, 3-ethylfurfural, 3-propylfurfural, 3-butylfurfural, 4,5-dimethylfurfural, 4,5-diethylfurfural, 3,5-dimethylfurfural, 3,5- Examples include diethylfurfural thiofonal, 3,4-dimethylfurfural, 3,4-diethylfurfural thiofonal, 3,4,5-trimethylfurfural, 3,4,5-triethylfurfural, and the like.
[0022]
【The invention's effect】
According to the production method of the present invention, the reaction mixture obtained by reacting the aromatic compound (II), N, N-dimethylformamide and phosgene and then hydrolyzing the compound does not produce a tar component, and hardly produces it. By the distillation, the aromatic aldehyde (I) can be obtained as a fraction.
[0023]
【Example】
EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited by this Example.
[0024]
Example 1
[Reaction of 2-methylfuran, N, N-dimethylformamide and phosgene]
While stirring at a temperature of 35 ° C. to 45 ° C. under reduced pressure (about −4.5 to −2.5 kPa (gauge reading pressure)) with monochlorobenzene (312 parts by mass), 2-methylfuran, N, N -The supply of dimethylformamide and phosgene was started, and 132 parts by mass of 2-methylfuran and 123.4 parts by mass of N, N-dimethylformamide were added dropwise over 12 hours, and at the same time, phosgene 182. 4 parts by mass were blown. After stopping the supply of phosgene, the reaction mixture was further stirred under the same pressure and in the same temperature range for 1 hour.
[0025]
〔Hydrolysis〕
While stirring the reaction mixture obtained above, water (about 230 parts by mass) was added over 1.5 hours in the same pressure range and the same temperature range, and then the same pressure range and the same temperature range were maintained for 10 minutes while stirring. Then, under the same pressure, 25% aqueous sodium hydroxide solution (containing about 330 parts by mass of sodium hydroxide in 100 parts by mass) is added over 5.5 hours at the same temperature range. While stirring in the same temperature range, the same pressure range and the same temperature range were maintained for 10 minutes for hydrolysis. Thereafter, the mixture was allowed to stand under atmospheric pressure in the same temperature range and separated to obtain a reaction mixture as an organic layer and an aqueous layer. Monochlorobenzene (about 250 parts by mass) was added to the obtained aqueous layer, stirred, allowed to stand, and separated to obtain an organic layer. The obtained organic layer was added to the previously obtained reaction mixture.
[0026]
[Washing of reaction mixture]
About 90 parts by mass of 5% aqueous sodium sulfate solution (including 5 parts by mass of sodium sulfate in 100 parts by mass) and 20% hydrochloric acid (including 20 parts by mass of hydrogen chloride in 100 parts by mass) were added to the reaction mixture obtained above. Add parts by weight, and after stirring, let stand, separate and remove the aqueous layer, add 5% aqueous sodium sulfate solution (about 100 parts by weight), stir, let stand, separate and separate the water layer Then, 5% aqueous sodium sulfate solution (about 100 parts by mass) was added and stirred, allowed to stand, and separated to remove the aqueous layer, followed by washing. The reaction mixture after washing contained 171.2 parts by mass of 5-methylfurfural.
[0027]
〔distillation〕
The reaction mixture after the above washing was distilled to obtain a reaction mixture as a fraction at 85 Torr (about 8.6 kPa) at 85 ° C., and the tar component was removed.
[0028]
[Rectification]
The reaction mixture obtained above was distilled to distill a fraction at 43 ° C. (mainly monochlorobenzene) at 30 Torr (about 3.9 kPa), and then a fraction at 43 ° C. at 30 Torr (about 3.9 kPa) ( The main component was monochlorobenzene). Next, 168 parts by mass of 5-methylfurfural was obtained as a fraction at 95 ° C. at 20 Torr (about 2.6 kPa) (extraction yield was 98%). In addition, the residue (tar component) after obtaining 5-methylfurfural was about 0.242 mass part.
[0029]
Comparative Example 1
〔reaction〕
1,2-dichloroethane (353 parts by mass), 2-methylfuran (130) while stirring at a temperature of 35 ° C. to 45 ° C. under reduced pressure (about −4.5 to −2.5 kPa (gauge reading pressure)). Part by mass) and N, N-dimethylformamide (123.4 parts by mass), and then reacted by blowing phosgene (182 parts by mass) over 13 hours under the same pressure and in the same temperature range. After the supply of phosgene was stopped, the reaction mixture was further stirred under the same pressure for 45 minutes in the same temperature range.
[0030]
〔Hydrolysis〕
In place of the reaction mixture obtained in Example 1, the reaction mixture obtained above was used, except that the reaction mixture was hydrolyzed and allowed to stand, liquid separation was performed, and the reaction mixture as an organic layer was used. And an aqueous layer. 1,2-Dichloroethane (280 parts by mass) was added to the obtained aqueous layer, and after stirring, the mixture was allowed to stand and liquid-separated to obtain an organic layer. The obtained organic layer was added to the previously obtained reaction mixture. .
[0031]
[Washing of reaction mixture]
The washing was carried out in the same manner as in Example 1 except that the reaction mixture obtained above was used instead of the reaction mixture obtained by hydrolysis in Example 1. The reaction mixture after washing contained 166.4 parts by mass of 5-methylfurfural.
[0032]
〔distillation〕
The reaction mixture obtained above was distilled to obtain a reaction mixture as a fraction at 110 ° C. at 230 Torr (about 30 kPa), and the tar component was removed.
[0033]
[Rectification]
The reaction mixture obtained above was rectified to distill off a 50 ° C. fraction (main components: 1,2-dichloroethane and monochlorobenzene) at 150 Torr (about 20 kPa), and then 30 at 50 Torr (about 6.6 kPa). A fraction at 0 ° C. (main components were 1,2-dichloroethane and monochlorobenzene) was distilled off. Subsequently, 150 parts by mass of 5-methylfurfural was obtained as a fraction at 95 ° C. at 20 Torr (about 2.6 kPa) (removal yield was 90%). In addition, the residue (tar component) after obtaining 5-methylfurfural was 5.1 mass parts.

Claims (4)

ハロゲン化芳香族炭化水素中で式(II)
Figure 0004228571
〔式中、R1、R2およびR3はそれぞれ独立に水素原子またはアルキル基を示し、Xは酸素原子を示す。〕
で示される芳香族化合物、N,N−ジメチルホルムアミドおよびホスゲンを反応させたのち加水分解して得た反応混合物を精留して、留分として式(I)
Figure 0004228571
〔式中、R1、R2、R3およびXはそれぞれ前記と同じ意味を示す。〕
で示される芳香族アルデヒドを得ることを特徴とする前記芳香族アルデヒドの製造方法。
Formula (II) in halogenated aromatic hydrocarbons
Figure 0004228571
Wherein, R 1, R 2 and R 3 independently represent a hydrogen atom or an alkyl group, X represents an oxygen atom. ]
The reaction mixture obtained by reacting the aromatic compound represented by the following formula, N, N-dimethylformamide and phosgene and then hydrolyzing the rectified fraction is rectified to obtain a fraction of the formula (I)
Figure 0004228571
[Wherein R 1 , R 2 , R 3 and X each have the same meaning as described above. ]
A process for producing the aromatic aldehyde, wherein the aromatic aldehyde is represented by the formula:
ハロゲン化芳香族炭化水素が塩素化芳香族炭化水素である請求項1に記載の製造方法。The production method according to claim 1, wherein the halogenated aromatic hydrocarbon is a chlorinated aromatic hydrocarbon. 反応混合物が、ハロゲン化芳香族炭化水素に式(II)で示される芳香族化合物、N,N−ジメチルホルムアミドおよびホスゲンを同時に供給しながら反応させたのち加水分解して得た反応混合物である請求項1に記載の製造方法。The reaction mixture is a reaction mixture obtained by reacting while simultaneously supplying an aromatic compound represented by the formula (II), N, N-dimethylformamide and phosgene to a halogenated aromatic hydrocarbon, and then hydrolyzing it. Item 2. The manufacturing method according to Item 1. 減圧下に精留する請求項1に記載の製造方法。The production method according to claim 1, wherein rectification is performed under reduced pressure.
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