JP2012017263A - Method of producing e,e-aliphatic conjugated diene compound by radical isomerization in the presence of urea - Google Patents

Method of producing e,e-aliphatic conjugated diene compound by radical isomerization in the presence of urea Download PDF

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JP2012017263A
JP2012017263A JP2010153718A JP2010153718A JP2012017263A JP 2012017263 A JP2012017263 A JP 2012017263A JP 2010153718 A JP2010153718 A JP 2010153718A JP 2010153718 A JP2010153718 A JP 2010153718A JP 2012017263 A JP2012017263 A JP 2012017263A
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conjugated diene
diene compound
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JP5470178B2 (en
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Naoki Ishibashi
尚樹 石橋
Miyoshi Yamashita
美与志 山下
Takehiko Fukumoto
毅彦 福本
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Shin Etsu Chemical Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To improve isomerization rate to an E,E-aliphatic conjugated diene compound from a geometric isomer of an aliphatic conjugated diene compounds other than the E,E-conjugated diene compound or these mixture.SOLUTION: A method of producing the E,E-aliphatic conjugated diene compound includes at least a step of isomerizing a 6-20C Z,Z-aliphatic conjugated diene compound, Z,E-aliphatic conjugated diene compound, E,Z-aliphatic conjugated diene compound or these mixture through radical reaction in the presence of a solvent and urea.

Description

本発明は、E,Z−脂肪族共役ジエン化合物又はZ,E−脂肪族共役ジエン化合物又はZ,Z−脂肪族共役ジエン化合物又はそれらの混合物を効率的にE,E−脂肪族共役ジエン化合物に異性化するE,E−脂肪族共役ジエン化合物の製造方法に関するものである。   The present invention relates to an E, Z-aliphatic conjugated diene compound, a Z, E-aliphatic conjugated diene compound, a Z, Z-aliphatic conjugated diene compound or a mixture thereof efficiently. The present invention relates to a method for producing an E, E-aliphatic conjugated diene compound that isomerizes into a diene.

共役ジエン化合物には、4種類の幾何異性体(E,E体、E,Z体、Z,E体、Z,Z体)共役ジエン化合物が存在するため、E,E−共役ジエン化合物を選択的に合成することが困難なことが多い。E,E体以外の異性体が選択的に得られたり、複数の異性体の混合物が得られたりする。また、製造方法によっては、E,E体以外の幾何異性体の方が容易に製造される場合や、E,E体以外の幾何異性体のみが市販されている場合もある。このような場合には共役ジエン化合物のE,E体以外の幾何異性体又はそれらの混合物をE,E体に異性化させる方法が重要となる。   There are four kinds of geometric isomers (E, E, E, Z, Z, E, Z, Z) conjugated diene compounds in conjugated diene compounds, so E, E-conjugated diene compounds are selected Are often difficult to synthesize. Isomers other than E and E are selectively obtained, or a mixture of a plurality of isomers is obtained. Depending on the production method, geometric isomers other than E and E isomers may be more easily produced, or only geometric isomers other than E and E isomers may be commercially available. In such a case, a method of isomerizing geometric isomers other than E and E forms of conjugated diene compounds or a mixture thereof into E and E forms becomes important.

異性化法としては、光異性化やラジカル異性化などが知られているが、基質によってはE,E体への異性化が十分に進行しないものもある。
例えば、C.A.Henrickらは非特許文献1において、3,7,11−トリメチル−11−メトキシ−Z2,E4−ドデカジエン酸をベンゼンチオールを用いてE2,E4体に異性化させているが、E2,E4体はE2,E4:Z2,E4=65:35の混合物としてしか得られていない。
As the isomerization method, photoisomerization, radical isomerization, and the like are known. However, depending on the substrate, there is a method in which isomerization to E and E forms does not proceed sufficiently.
For example, C.I. A. In Non-Patent Document 1, Henrick et al. Isomerized 3,7,11-trimethyl-11-methoxy-Z2, E4-dodecadienoic acid to E2, E4 using benzenethiol, It is obtained only as a mixture of E2, E4: Z2, E4 = 65: 35.

また、上記のように幾何異性体混合物が得られた場合に、尿素による包接を利用してE, E体を分離する方法が知られている。この方法はE,E体が他の幾何異性体に比べて尿素の結晶に包接され易いことを利用しているが、その選択性は必ずしも高くなく、E,E体の母液への流出、包接結晶への他の幾何異性体の混入が見られる。そのため包接操作を複数回行う必要があり、収率も低下してしまう。
例えば、N.Ragoussisらは非特許文献2において、尿素による包接を利用して、(3E, 5E)−オクタジエン酸エチル、(2E,4E)−オクタジエン酸エチルを(3E,5Z)−オクタジエン酸エチルから分離しようと試みている。しかし、(E,E)−オクタジエン酸エチルの包接選択性が低いため、4回包接操作を行っても(3E,5Z)−オクタジエン酸エチルは幾何異性体純度60%でしか得られていない。
このように、幾何異性体の異性化や尿素による包接を利用した分離といった方法よりも簡便に、且つ高純度でE,E−共役ジエン化合物が得られる方法が望まれていた。
In addition, a method is known in which E and E isomers are separated using inclusion by urea when a geometric isomer mixture is obtained as described above. This method uses the fact that the E and E isomers are more likely to be included in urea crystals than other geometric isomers, but the selectivity is not necessarily high, and the E and E isomers flow into the mother liquor. The inclusion of other geometric isomers in the inclusion crystal is observed. Therefore, it is necessary to perform the inclusion operation a plurality of times, and the yield is also reduced.
For example, N.I. In Non-Patent Document 2, Ragoussis et al., Using urea inclusion, will separate ethyl (3E, 5E) -octadienoate and ethyl (2E, 4E) -octadienoate from ethyl (3E, 5Z) -octadienoate. I am trying. However, since the inclusion selectivity of ethyl (E, E) -octadienoate is low, ethyl (3E, 5Z) -octadienoate is obtained only with a geometric isomer purity of 60% even after four clathration operations. Absent.
Thus, there has been a demand for a method that can obtain an E, E-conjugated diene compound more easily and with a higher purity than methods such as isomerization of geometric isomers and separation using inclusion by urea.

J.Org.Chem.40(1),1(1975)J. et al. Org. Chem. 40 (1), 1 (1975) J.Agric.Food Chem.52(16),5047(2004)J. et al. Agric. Food Chem. 52 (16), 5047 (2004)

本発明は前記の課題を解決するためになされたもので、脂肪族共役ジエン化合物のE,E体以外の幾何異性体又はそれらの混合物から、E,E−脂肪族共役ジエン化合物への異性化率を向上させることを目的とする。   The present invention has been made to solve the above-mentioned problems, and isomerization of an aliphatic conjugated diene compound from a geometric isomer other than the E and E isomers or a mixture thereof to an E, E-aliphatic conjugated diene compound. The purpose is to improve the rate.

本発明者らは、上記課題の解決のため鋭意検討した結果、溶媒及び尿素存在下でラジカル異性化を行うことが、前記課題の解決に有用であることを見出し、本発明をなすに至ったものである。
本発明は、炭素数6〜20のZ,Z−脂肪族共役ジエン化合物、Z,E−脂肪族共役ジエン化合物、E,Z−脂肪族共役ジエン化合物又はこれらの混合物を溶媒及び尿素存在下、ラジカル反応により異性化させるステップを少なくとも含むE,E−脂肪族共役ジエン化合物の製造方法を提供する。
As a result of intensive studies for solving the above problems, the present inventors have found that performing radical isomerization in the presence of a solvent and urea is useful for solving the above problems, and have made the present invention. Is.
The present invention relates to a Z, Z-aliphatic conjugated diene compound having 6 to 20 carbon atoms, a Z, E-aliphatic conjugated diene compound, an E, Z-aliphatic conjugated diene compound or a mixture thereof in the presence of a solvent and urea. Provided is a method for producing an E, E-aliphatic conjugated diene compound including at least a step of isomerization by a radical reaction.

本発明によれば、例えばZ9,E11−テトラデカジエニルアセテートのようにE,E体への異性化が進行しにくい脂肪族共役ジエン化合物でさえも、高い異性化率でE,E体に異性化させることができる。   According to the present invention, even an aliphatic conjugated diene compound that hardly undergoes isomerization to the E and E forms, such as Z9, E11-tetradecadienyl acetate, can be converted to the E and E forms at a high isomerization rate. It can be isomerized.

本発明について、以下に詳細に説明する。
本発明のE,E−脂肪族共役ジエン化合物の製造方法は、炭素数6〜20のZ,Z−脂肪族共役ジエン化合物、Z,E−脂肪族共役ジエン化合物、E,Z−脂肪族共役ジエン化合物又はこれらの混合物を尿素存在下、ラジカル反応により異性化させることを特徴とするE,E−脂肪族共役ジエン化合物の製造方法である。上記混合物には、E,E−脂肪族共役ジエン化合物が含まれていてもよい。
The present invention will be described in detail below.
The method for producing the E, E-aliphatic conjugated diene compound of the present invention comprises a Z, Z-aliphatic conjugated diene compound having 6 to 20 carbon atoms, a Z, E-aliphatic conjugated diene compound, and an E, Z-aliphatic conjugate. A process for producing an E, E-aliphatic conjugated diene compound, characterized in that a diene compound or a mixture thereof is isomerized by radical reaction in the presence of urea. The mixture may contain an E, E-aliphatic conjugated diene compound.

本発明のZ,Z体、Z,E体、E,Z体又はこれらの混合物の炭素数6〜20の脂肪族共役ジエン化合物としては、置換又は非置換の炭素数6〜20の炭化水素が挙げられる。ここで、炭素数6〜20の炭化水素としては、例えば1,3−ヘキサジエン、2,4−ヘキサジエン、1,3−ヘプタジエン、2,4−ヘプタジエン、1,3−オクタジエン、2,4−オクタジエン、3,5−オクタジエン、1,3−ノナジエン、2,4−ノナジエン、3,5−ノナジエン、1,3−デカジエン、2,4−デカジエン、3,5−デカジエン、4,6−デカジエン、1,3−ウンデカジエン、2,4−ウンデカジエン、3,5−ウンデカジエン、4,6−ウンデカジエン、1,3−ドデカジエン、2,4−ドデカジエン、3,5−ドデカジエン、4,6−ドデカジエン、5,7−ドデカジエン、1,3−トリデカジエン、2,4−トリデカジエン、3,5−トリデカジエン、4,6−トリデカジエン、5,7−トリデカジエン、1,3−テトラデカジエン、2,4−テトラデカジエン、3,5−テトラデカジエン、4,6−テトラデカジエン、5,7−テトラデカジエン、6,8−テトラデカジエン、1,3−ペンタデカジエン、2,4−ペンタデカジエン、3,5−ペンタデカジエン、4,6−ペンタデカジエン、5,7−ペンタデカジエン、6,8−ペンタデカジエン、1,3−ヘキサデカジエン、2,4−ヘキサデカジエン、3,5−ヘキサデカジエン、4,6−ヘキサデカジエン、5,7−ヘキサデカジエン、6,8−ヘキサデカジエン、7,9−ヘキサデカジエン、1,3−ヘプタデカジエン、2,4−ヘプタデカジエン、3,5−ヘプタデカジエン、4,6−ヘプタデカジエン、5,7−ヘプタデカジエン、6,8−ヘプタデカジエン、7,9−ヘプタデカジエン、1,3−オクタデカジエン、2,4−オクタデカジエン、3,5−オクタデカジエン、4,6−オクタデカジエン、5,7−オクタデカジエン、6,8−オクタデカジエン、7,9−オクタデカジエン、8,10−オクタデカジエン、1,3−ノナデカジエン、2,4−ノナデカジエン、3,5−ノナデカジエン、4,6−ノナデカジエン、5,7−ノナデカジエン、6,8−ノナデカジエン、7,9−ノナデカジエン、8,10−ノナデカジエン、1,3−イコサジエン、2,4−イコサジエン、3,5−イコサジエン、4,6−イコサジエン、5,7−イコサジエン、6,8−イコサジエン、7,9−イコサジエン、8,10−イコサジエン、9,11−イコサジエン等が挙げられる。
これらの炭化水素に置換されてもよい置換基としては、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、sec−ブチル基、tert−ブチル基等の炭素数1〜4のアルキル基、水酸基、炭素数1〜6のアルコキシ基、炭素数1〜6(カルボニル基の炭素を含む)のアシルオキシ基、ホルミル基、カルボニル基、カルボキシル基、炭素数1〜7(カルボニル基の炭素を含む)のアルコキシカルボニル基、エポキシ基等が挙げられる。
Examples of the Z, Z isomer, Z, E isomer, E, Z isomer of the present invention and the aliphatic conjugated diene compound having 6 to 20 carbon atoms include substituted or unsubstituted hydrocarbons having 6 to 20 carbon atoms. Can be mentioned. Here, examples of the hydrocarbon having 6 to 20 carbon atoms include 1,3-hexadiene, 2,4-hexadiene, 1,3-heptadiene, 2,4-heptadiene, 1,3-octadiene, and 2,4-octadiene. 3,5-octadiene, 1,3-nonadiene, 2,4-nonadiene, 3,5-nonadiene, 1,3-decadiene, 2,4-decadiene, 3,5-decadiene, 4,6-decadiene, 1 , 3-Undecadiene, 2,4-undecadiene, 3,5-undecadiene, 4,6-undecadiene, 1,3-dodecadiene, 2,4-dodecadiene, 3,5-dodecadiene, 4,6-dodecadiene, 5,7 -Dodecadiene, 1,3-tridecadiene, 2,4-tridecadiene, 3,5-tridecadiene, 4,6-tridecadiene, 5,7-tridecadiene 1,3-tetradecadiene, 2,4-tetradecadiene, 3,5-tetradecadiene, 4,6-tetradecadiene, 5,7-tetradecadiene, 6,8-tetradecadiene, 1, 3-pentadecadiene, 2,4-pentadecadiene, 3,5-pentadecadiene, 4,6-pentadecadiene, 5,7-pentadecadiene, 6,8-pentadecadiene, 1,3- Hexadecadiene, 2,4-hexadecadiene, 3,5-hexadecadiene, 4,6-hexadecadiene, 5,7-hexadecadiene, 6,8-hexadecadiene, 7,9-hexadeca Diene, 1,3-heptadecadien, 2,4-heptadecadien, 3,5-heptadecadien, 4,6-heptadecadien, 5,7-heptadecadien, 6,8-heptadecadien, 7,9-hepta Cadien, 1,3-octadecadien, 2,4-octadecadien, 3,5-octadecadien, 4,6-octadecadien, 5,7-octadecadien, 6,8-octadecadien, 7,9-octadecadien, 8,10-octadecadien, 1,3-nonadecadien, 2,4-nonadecadien, 3,5-nonadecadien, 4,6-nonadecadien, 5,7-nonadecadien, 6,8- Nonadecadien, 7,9-nonadecadien, 8,10-nonadecadien, 1,3-icosadien, 2,4-icosadien, 3,5-icosadien, 4,6-icosadien, 5,7-icosadien, 6,8-icosadien, 7,9-icosadien, 8,10-icosadien, 9,11-icosadien and the like can be mentioned.
Examples of the substituent that may be substituted with these hydrocarbons include 1 to 4 carbon atoms such as a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, and a tert-butyl group. Alkyl group, hydroxyl group, alkoxy group having 1 to 6 carbon atoms, acyloxy group having 1 to 6 carbon atoms (including carbon of carbonyl group), formyl group, carbonyl group, carboxyl group, 1 to 7 carbon atoms (of carbonyl group) (Including carbon) alkoxycarbonyl groups, epoxy groups, and the like.

尿素の使用量は、脂肪族共役ジエン化合物100質量部に対して、好ましくは10〜1000質量部、特に好ましくは50〜300質量部である。   The amount of urea used is preferably 10 to 1000 parts by mass, particularly preferably 50 to 300 parts by mass with respect to 100 parts by mass of the aliphatic conjugated diene compound.

溶媒としては、Z,Z−脂肪族共役ジエン化合物、Z,E−脂肪族共役ジエン化合物、E,Z−脂肪族共役ジエン化合物、尿素、後述するラジカル媒体及びラジカル開始剤を溶解できるものが好ましく、例えばメタノール、エタノール等のアルコールが好ましく、その使用量は、脂肪族共役ジエン化合物100質量部に対して、好ましくは10〜1000質量部、特に好ましくは50〜1000質量部である。   As the solvent, those capable of dissolving a Z, Z-aliphatic conjugated diene compound, a Z, E-aliphatic conjugated diene compound, an E, Z-aliphatic conjugated diene compound, urea, a radical medium and a radical initiator described later are preferable. For example, alcohols such as methanol and ethanol are preferred, and the amount used is preferably 10 to 1000 parts by mass, particularly preferably 50 to 1000 parts by mass, with respect to 100 parts by mass of the aliphatic conjugated diene compound.

ラジカル媒介物質としては、例えばベンゼンチオール、ジフェニルジスルフィド等が挙げられ、その使用量は、脂肪族共役ジエン化合物1molに対し、好ましくは0.00001〜0.1mol、特に好ましくは0.0001〜0.05molである。
また、ラジカル開始剤としては、例えば2,2’−アゾビス(イソブチロニトリル)、2, 2’−アゾビス(2−メチルプロピオン酸メチル)、2,2’−アゾビス[2−(2−イミダゾリン−2−イル)プロパン]二塩酸塩等が挙げられ、その使用量は、脂肪族共役ジエン化合物1molに対し、好ましくは0.0001〜0.5mol、特に好ましくは0.001〜0.1molである。
Examples of the radical mediator include benzene thiol, diphenyl disulfide, and the like, and the amount used is preferably 0.00001 to 0.1 mol, particularly preferably 0.0001 to 0. 0, with respect to 1 mol of the aliphatic conjugated diene compound. 05 mol.
Examples of the radical initiator include 2,2′-azobis (isobutyronitrile), 2,2′-azobis (methyl 2-methylpropionate), 2,2′-azobis [2- (2-imidazoline). -2-yl) propane] dihydrochloride and the like, and the amount used is preferably 0.0001 to 0.5 mol, particularly preferably 0.001 to 0.1 mol, relative to 1 mol of the aliphatic conjugated diene compound. is there.

E,E−脂肪族共役ジエン化合物は、脂肪族共役ジエン化合物、溶媒、尿素、ラジカル媒介物質、及びラジカル開始剤の混合物を、好ましくは25〜150℃で異性化させて得ることができる。
好ましい態様の一つは、脂肪族共役ジエン化合物、溶媒、尿素、及びラジカル媒介物質の混合物を還流しながら、ラジカル開始剤の溶液を適下する。この態様は、ラジカル開始剤の滴下中は異性化反応が停止することを防ぐことができる点で好ましい。ラジカル開始剤の滴下には、0.5〜10時間かけるのが好ましく、滴下終了後、0.5〜30時間還流を継続することが好ましい。
The E, E-aliphatic conjugated diene compound can be obtained by isomerizing a mixture of an aliphatic conjugated diene compound, a solvent, urea, a radical mediator, and a radical initiator, preferably at 25 to 150 ° C.
In one preferred embodiment, the radical initiator solution is submerged while refluxing the mixture of aliphatic conjugated diene compound, solvent, urea, and radical mediator. This embodiment is preferable in that the isomerization reaction can be prevented from stopping during the dropwise addition of the radical initiator. The dripping of the radical initiator is preferably performed for 0.5 to 10 hours, and it is preferable to continue the reflux for 0.5 to 30 hours after the dropping.

E,E−脂肪族共役ジエン化合物を得るために、好ましくは、異性化させるステップの後、得られた反応液を水和してE,E−脂肪族共役ジエン化合物を尿素から分離するステップをさらに含む。すなわち、異性化反応させるステップの終了後、尿素を水和させることにより、E,E−脂肪族共役ジエンを分離することができる。
水和は、例えば、必要に応じて溶媒の一部を留去し、反応液に水を加えることによって行われる。尿素は水に溶解するため、有機相を取り出して、蒸留、カラムクロマトグラフィー等の公知の方法により、E,E−脂肪族共役ジエン化合物を得ることができる。尿素の結晶の構造は、小分子が入るのに丁度良い大きさの空孔を有しており、様々な化合物と包接化合物を作ることができる。異性化反応により得られたE,E−脂肪族共役ジエン化合物が尿素に包接されているが、尿素が水和することにより、E,E−脂肪族共役ジエン化合物が放出されると考えられる。なお、尿素は、Z,Z−脂肪族共役ジエン化合物、Z,E−脂肪族共役ジエン化合物及びE,Z−脂肪族共役ジエン化合物に比べ、E,E−脂肪族共役ジエン化合物と包接化合物を形成し易い。
In order to obtain an E, E-aliphatic conjugated diene compound, preferably, after the isomerization step, a step of separating the E, E-aliphatic conjugated diene compound from urea by hydrating the obtained reaction liquid. In addition. That is, after completion of the isomerization reaction step, the E, E-aliphatic conjugated diene can be separated by hydrating urea.
Hydration is performed, for example, by distilling off a part of the solvent as necessary and adding water to the reaction solution. Since urea dissolves in water, the organic phase is taken out, and an E, E-aliphatic conjugated diene compound can be obtained by a known method such as distillation or column chromatography. The structure of urea crystals has pores that are just large enough for small molecules to enter, and can make various compounds and inclusion compounds. Although the E, E-aliphatic conjugated diene compound obtained by the isomerization reaction is included in urea, it is considered that the urea is hydrated to release the E, E-aliphatic conjugated diene compound. . Urea is an E, E-aliphatic conjugated diene compound and an inclusion compound as compared with Z, Z-aliphatic conjugated diene compound, Z, E-aliphatic conjugated diene compound and E, Z-aliphatic conjugated diene compound. Is easy to form.

得られた反応液を水和してE,E−脂肪族共役ジエン化合物を尿素から分離するステップは、好ましくは、異性化させるステップの後、尿素を水和させずに、得られた反応液を冷却して尿素を析出する段階と、冷却された反応液をろ過して尿素含有物を分離する段階と、分離された尿素含有物を水和することにより、E,E−脂肪族共役ジエン化合物を取り出す段階とを少なくとも含む。すなわち、尿素を水和させずに反応液をそのまま冷却して尿素を析出させた後に、ろ過した尿素を水和させることにより高純度のE,E−脂肪族共役ジエンが得られる。
得られた反応液を冷却して尿素を析出する段階において、冷却温度は、好ましくは−30〜25℃、特に好ましくは−10〜10℃である。また、ろ過により分離された尿素含有物の水和は、例えば、分離された尿素含有物に水を加えることによって行われる。尿素は水に溶解するため、有機相を取り出して、蒸留、カラムクロマトグラフィー等の公知の方法により、E,E−脂肪族共役ジエン化合物を得ることができる。
The step of separating the E, E-aliphatic conjugated diene compound from urea by hydrating the obtained reaction solution is preferably performed without hydrating urea after the isomerization step. Is cooled to precipitate urea, the cooled reaction solution is filtered to separate the urea-containing material, and the separated urea-containing material is hydrated to obtain an E, E-aliphatic conjugated diene. Removing the compound. That is, the reaction solution is cooled as it is without hydrating urea to precipitate urea, and then the filtered urea is hydrated to obtain high purity E, E-aliphatic conjugated diene.
In the stage of cooling the obtained reaction liquid to precipitate urea, the cooling temperature is preferably −30 to 25 ° C., particularly preferably −10 to 10 ° C. Moreover, the hydration of the urea-containing material separated by filtration is performed, for example, by adding water to the separated urea-containing material. Since urea dissolves in water, the organic phase is taken out, and an E, E-aliphatic conjugated diene compound can be obtained by a known method such as distillation or column chromatography.

以下、実施例及び比較例を示し、本発明を具体的に説明するが、本発明は下記の実施例に制限されるものではない。
<実施例1>
エタノール224.2gに尿素336.3g、ジフェニルジスルフィド0.37g(0.0017mol)を加え、加熱還流させた後、Z9,E11−テトラデカジエニルアセテート224.2g(Z,E体の純度81.8%、幾何異性体合計の純度96.2%、0.855mol、)を加えて再び還流させた。その後、2,2’−アゾビス(2−メチルプロピオン酸メチル)1.97g(0.00855mol)のエタノール29.6g溶液を2時間かけて滴下し、18時間還流した。続いて徐々に360mmHgまで減圧してエタノール110gを留去した。
食塩水で2回洗浄した後、減圧下濃縮し、E9,E11−テトラデカジエニルアセテートの粗生成物232.6g(E,E体の純度70.2%、幾何異性体合計の純度92.4%、0.852mol)を得た。
蒸留により、主留(132〜139℃/5mm)は209.47g(E,E体の純度73.0%、幾何異性体合計の純度96.5%、0.801mol)、前留4.52g(E,E体の純度56.1%、幾何異性体合計の純度78.3%、0.0140mol)が得られた。反応全体の収率は95.3%であった。
EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated concretely, this invention is not restrict | limited to the following Example.
<Example 1>
After adding 336.3 g of urea and 0.37 g (0.0017 mol) of diphenyl disulfide to 224.2 g of ethanol and heating to reflux, 224.2 g of Z9, E11-tetradecadienyl acetate (purity of Z, E form 81. 8%, total purity of geometric isomers 96.2%, 0.855 mol,) was added and refluxed again. Thereafter, a solution of 2,2′-azobis (methyl 2-methylpropionate) 1.97 g (0.00855 mol) in ethanol 29.6 g was added dropwise over 2 hours and refluxed for 18 hours. Subsequently, the pressure was gradually reduced to 360 mmHg to distill off 110 g of ethanol.
After washing twice with brine, the reaction mixture was concentrated under reduced pressure, and 232.6 g of a crude product of E9, E11-tetradecadienyl acetate (purity of E, E isomer 70.2%, geometric isomer purity 92. 4%, 0.852 mol).
By distillation, the main fraction (132 to 139 ° C./5 mm) was 209.47 g (E, E purity 73.0%, geometric isomer purity 96.5%, 0.801 mol), fore distillation 4.52 g (E, purity of E-isomer 56.1%, total geometric isomer purity 78.3%, 0.0140 mol) was obtained. The overall yield of the reaction was 95.3%.

<実施例2>
エタノール224.2gに尿素336.3g、ジフェニルジスルフィド0.37g(0.0017mol)を加え、加熱還流させた後、Z9, E11−テトラデカジエニルアセテート224.2g(Z,E体の純度81.8%、幾何異性体合計の純度96.2%、0.855mol)を加えて再び還流させた。その後、実施例1と同様のラジカル開始剤1.97g(0.00855mol)のエタノール29.6g溶液を2時間かけて滴下し、18時間還流した。
得られた反応液をゆっくり5℃まで冷却した後、5℃で一晩放置して尿素を析出させた。尿素をろ別し、温水で洗浄後、蒸留することによりE9,E11−テトラデカジエニルアセテート100.0g(E,E体の純度84.5%、幾何異性体合計の純度98.3%、0.389mol)を得た。また、母液を減圧濃縮、蒸留することによりE9,E11−テトラデカジエニルアセテート111.1g(E,E体純度63.0%、幾何異性体合計の純度96.8%、0.426mol)が得られた。反応全体の収率は95.3%であった。
<Example 2>
After adding 336.3 g of urea and 0.37 g (0.0017 mol) of diphenyl disulfide to 224.2 g of ethanol and heating to reflux, 224.2 g of Z9, E11-tetradecadienyl acetate (purity of Z, E form 81. 8%, purity of geometric isomers total 96.2%, 0.855 mol) was added and refluxed again. Thereafter, a solution of 1.97 g (0.00855 mol) of the same radical initiator as in Example 1 in 29.6 g of ethanol was added dropwise over 2 hours and refluxed for 18 hours.
The obtained reaction solution was slowly cooled to 5 ° C. and then left overnight at 5 ° C. to precipitate urea. Urea was filtered off, washed with warm water, and then distilled to obtain 100.0 g of E9, E11-tetradecadienyl acetate (purity of E, E isomer 84.5%, total geometric isomer purity 98.3%, 0.389 mol) was obtained. The mother liquor was concentrated under reduced pressure and distilled to obtain 111.1 g of E9, E11-tetradecadienyl acetate (E, E purity 63.0%, geometric isomer purity 96.8%, 0.426 mol). Obtained. The overall yield of the reaction was 95.3%.

<比較例1>
エタノール224.2gにジフェニルジスルフィド0.37g(0.0017mol)を加え、加熱還流させた後、Z9,E11−テトラデカジエニルアセテート224.2 g(Z,E体の純度81.8%、幾何異性体合計の純度96.2%、0.855mol)を加えて再び還流させた。その後、実施例1と同様のラジカル開始剤1.97g(0.00855mol)のエタノール29.6g溶液を2時間かけて滴下し、18時間還流した。得られた反応液を減圧下濃縮してE9,E11−テトラデカジエニルアセテートの粗生成物215.8g(E,E体の純度60.5%、幾何異性体合計の純度96.0%、0.821mol)を得た。
蒸留により主留(132〜139℃/5mm)186.1g(E,E体の純度62.0%、幾何異性体合計の純度96.8%、0.714mol)、前留23.7g(E,E体純度55.4%、幾何異性体合計の純度90.9%、0.085mol)が得られた。反応全体の収率は93.5%であった。
<Comparative Example 1>
After adding 0.37 g (0.0017 mol) of diphenyl disulfide to 224.2 g of ethanol and heating to reflux, 224.2 g of Z9, E11-tetradecadienyl acetate (purity of Z, E form 81.8%, geometric The purity of the total isomer was 96.2%, 0.855 mol) was added and refluxed again. Thereafter, a solution of 1.97 g (0.00855 mol) of the same radical initiator as in Example 1 in 29.6 g of ethanol was added dropwise over 2 hours and refluxed for 18 hours. The reaction solution thus obtained was concentrated under reduced pressure to give 215.8 g of a crude product of E9, E11-tetradecadienyl acetate (purity of E, E isomer 60.5%, total geometric isomer purity 96.0%, 0.821 mol) was obtained.
The main fraction (132-139 ° C./5 mm) by distillation was 186.1 g (E, E purity 62.0%, total geometric isomer purity 96.8%, 0.714 mol), front fraction 23.7 g (E , E-form purity 55.4%, total geometric isomer purity 90.9%, 0.085 mol). The overall yield of the reaction was 93.5%.

<比較例2>
メタノール189.8gに尿素138.0gを加え、加熱還流させた後、Z9, E11−テトラデカジエニルアセテート224.2g(Z, E体の純度81.8%、幾何異性体合計の純度96.2%、0.855mol)を加えて再び還流させた。
得られた反応液をゆっくり5℃まで冷却した後、5℃で一晩放置して尿素を析出させた。尿素をろ別し、温水で洗浄することによりE9, E11−テトラデカジエニルアセテートが58.6g(E,E体の純度53.8%、幾何異性体合計の純度96.0%、0.223mol)得られた。
これを尿素73.3gの熱メタノール110.0g溶液に加え、加熱還流させた後、ゆっくり5℃まで冷却し、5℃で一晩放置して尿素を析出させた。尿素をろ別し、温水で洗浄することにより、E9,E11−テトラデカジエニルアセテートが33.0 g(E, E体の純度84.5%、幾何異性体合計の純度98.0%、0.128mol)得られた。尿素をろ別した際の母液2回分からはZ9,E11−テトラデカジエニルアセテートが183.1g(Z,E体の純度88.5%、幾何異性体合計の純度93.2%、0.676mol)得られた。反応全体の収率は94.0%であった。
<Comparative example 2>
After 138.0 g of urea was added to 189.8 g of methanol and heated to reflux, 224.2 g of Z9, E11-tetradecadienyl acetate (purity of Z, E isomer 81.8%, geometric isomer purity 96. 2%, 0.855 mol) was added and refluxed again.
The obtained reaction solution was slowly cooled to 5 ° C. and then left overnight at 5 ° C. to precipitate urea. Urea was filtered off and washed with warm water to obtain 58.6 g of E9, E11-tetradecadienyl acetate (purity of E, E isomer 53.8%, total geometric isomer purity 96.0%, 0.005%). 223 mol).
This was added to a solution of 113.3 g of hot methanol in 73.3 g of urea, heated to reflux, slowly cooled to 5 ° C., and allowed to stand overnight at 5 ° C. to precipitate urea. By filtering urea and washing with warm water, 33.0 g of E9, E11-tetradecadienyl acetate (E, purity of E isomer 84.5%, total purity of geometric isomers 98.0%, 0.128 mol) was obtained. From the two mother liquors when the urea was filtered off, 183.1 g of Z9, E11-tetradecadienyl acetate (Z, E purity 88.5%, total geometric isomer purity 93.2%, 0.3%). 676 mol). The overall yield of the reaction was 94.0%.

Claims (3)

炭素数6〜20のZ,Z−脂肪族共役ジエン化合物、Z,E−脂肪族共役ジエン化合物、E,Z−脂肪族共役ジエン化合物又はこれらの混合物を溶媒及び尿素存在下、ラジカル反応により異性化させるステップを少なくとも含むE,E−脂肪族共役ジエン化合物の製造方法。   A isomer of a C6-20 Z, Z-aliphatic conjugated diene compound, Z, E-aliphatic conjugated diene compound, E, Z-aliphatic conjugated diene compound or a mixture thereof by a radical reaction in the presence of a solvent and urea. A process for producing an E, E-aliphatic conjugated diene compound, comprising at least a step of crystallization. 上記異性化させるステップの後、得られた反応液を水和してE,E−脂肪族共役ジエン化合物を尿素から分離するステップをさらに含む請求項1に記載のE,E−脂肪族共役ジエン化合物の製造方法。   The E, E-aliphatic conjugated diene according to claim 1, further comprising a step of hydrating the reaction solution obtained after the isomerizing step to separate the E, E-aliphatic conjugated diene compound from urea. Compound production method. 上記水和によりE,E−脂肪族共役ジエン化合物を尿素から分離するステップが、
上記得られた反応液を冷却して尿素を析出する段階と、
上記冷却された反応液をろ過して尿素含有物を分離する段階と、
上記分離された尿素含有物を水和することにより、E,E−脂肪族共役ジエン化合物を取り出す段階と
を少なくとも含む請求項2に記載のE,E−脂肪族共役ジエン化合物の製造方法。
Separating the E, E-aliphatic conjugated diene compound from urea by hydration,
Cooling the reaction solution obtained above to precipitate urea;
Filtering the cooled reaction liquid to separate urea-containing material;
The method for producing an E, E-aliphatic conjugated diene compound according to claim 2, comprising at least a step of removing the E, E-aliphatic conjugated diene compound by hydrating the separated urea-containing material.
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