JPH05339176A - Production of alkyltetralin - Google Patents
Production of alkyltetralinInfo
- Publication number
- JPH05339176A JPH05339176A JP4171773A JP17177392A JPH05339176A JP H05339176 A JPH05339176 A JP H05339176A JP 4171773 A JP4171773 A JP 4171773A JP 17177392 A JP17177392 A JP 17177392A JP H05339176 A JPH05339176 A JP H05339176A
- Authority
- JP
- Japan
- Prior art keywords
- hexene
- reaction
- cyclization
- dialkyl
- acid
- 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.)
- Granted
Links
Classifications
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/52—Improvements 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
Description
【０００１】[0001]
【産業上の利用分野】この発明は、化学原料として有用
な１，４−ジメチル−５，８−ジアルキルテトラリンの
製造方法に関する。より詳しくは５−（ｐ−ジアルキ
ル）−ヘキセンの環化による製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing 1,4-dimethyl-5,8-dialkyltetralin useful as a chemical raw material. More specifically, it relates to a production method by cyclization of 5- (p-dialkyl) -hexene.
【０００２】[0002]
【従来の技術】アルキルテトラリンは、脱水素によりア
ルキルナフタレンとなることは知られている。フェニル
ヘキセン、トリルヘキセン、フェニルペンテンあるいは
トリルペンテン等の環化により相当するアルキル置換テ
トラリンを合成する方法は、広く知られている。この方
法は、一般に触媒としてＢＦ3やＨＦが用いられ、溶媒
の存在ないしは不存在下、室温付近の温度で処理し、高
収率で目的とするテトラリンを得ている（Ｊ．ｏｒｇ．
ｃｈｅｍ．Ｖｏｌ３０、Ｐ８２（１９６５）。また、フ
エニルペンテンまたはフェニルヘキセンを、不均一系触
媒として固体リン酸を用いて２００〜４５０℃で環化す
る方法（特公昭６０−２７６４９号公報）が知られてい
る。2. Description of the Related Art It is known that alkyltetralin becomes an alkylnaphthalene by dehydrogenation. A method of synthesizing a corresponding alkyl-substituted tetralin by cyclization of phenylhexene, tolylhexene, phenylpentene, tolylpentene or the like is widely known. In this method, BF 3 or HF is generally used as a catalyst, and the target tetralin is obtained in high yield by treating at a temperature near room temperature in the presence or absence of a solvent (J. org.
chem. Vol 30, P82 (1965). Also known is a method (Japanese Patent Publication No. 60-27649) in which phenylpentene or phenylhexene is cyclized at 200 to 450 ° C. using solid phosphoric acid as a heterogeneous catalyst.
【０００３】一方、ＢＦ3、ＡｌＣｌ3等のルイス酸や硫
酸等の鉱酸を触媒とし、均一系ないしは不均一系でアル
キルベンゼンをオレフィンで核アルキル化できることは
周知である。この場合、不均一系では、０〜１００℃の
反応温度を採用するのが一般的で、反応温度が１００℃
を超えると重合等の副反応が起こり、好ましくない。On the other hand, it is well known that alkylbenzene can be nuclear-alkylated with an olefin in a homogeneous or heterogeneous system by using a Lewis acid such as BF 3 or AlCl 3 or a mineral acid such as sulfuric acid as a catalyst. In this case, in a heterogeneous system, a reaction temperature of 0 to 100 ° C is generally adopted, and the reaction temperature is 100 ° C.
If it exceeds, side reactions such as polymerization occur, which is not preferable.
【０００４】[0004]
【発明が解決しようとする課題】上記したとおり、アル
キル置換フェニルヘキセンは、環化によって相当するテ
トラリンに転化すること、また、この環化反応の触媒と
してルイス酸や鉱酸を用いることができることは、既に
述べたアルキル化の例を見るまでもなく、当業者であれ
ば容易に想像できる。本発明者らは、５−（ｐ−ジアル
キル）−ヘキセンの環化について鋭意検討を行った。そ
の結果、５−（ｐ−ジアルキル）−ヘキセンの環化は、
上記条件下では著しく困難であった。As described above, alkyl-substituted phenylhexene can be converted to the corresponding tetralin by cyclization, and Lewis acid or mineral acid can be used as a catalyst for this cyclization reaction. Of course, one skilled in the art can easily imagine without looking at the examples of alkylation already mentioned. The present inventors diligently studied cyclization of 5- (p-dialkyl) -hexene. As a result, the cyclization of 5- (p-dialkyl) -hexene is
It was extremely difficult under the above conditions.
【０００５】この発明の目的は、５−（ｐ−ジアルキ
ル）−ヘキセンを環化して高収率でテトラリンを得るこ
とができるアルキルテトラリンの製造方法を提供するこ
とにある。An object of the present invention is to provide a process for producing alkyltetralin which is capable of cyclizing 5- (p-dialkyl) -hexene to obtain tetralin in high yield.
【０００６】[0006]
【課題を解決するための手段】本発明者らは、上記目的
を達成すべく鋭意試験研究を行った。その結果、５−
（ｐ−ジアルキル）−ヘキセンの環化反応は、触媒とし
て硫酸または芳香族スルホン酸を用い、反応温度を１２
０〜２５０℃に保持することによって、高収率で目的物
であるアルキルテトラリンが得られることを究明し、こ
の発明に到達した。[Means for Solving the Problems] The inventors of the present invention have conducted earnest research to achieve the above object. As a result, 5-
The cyclization reaction of (p-dialkyl) -hexene uses sulfuric acid or aromatic sulfonic acid as a catalyst, and the reaction temperature is 12
It was clarified that the target product, alkyltetralin, can be obtained in a high yield by maintaining the temperature at 0 to 250 ° C., and the present invention was reached.
【０００７】すなわちこの発明は、５−（ｐ−ジアルキ
ル）−ヘキセンに触媒として硫酸および／または芳香族
スルホン酸を添加し、反応温度１２０〜２５０℃で環化
処理するのである。That is, according to the present invention, sulfuric acid and / or aromatic sulfonic acid is added as a catalyst to 5- (p-dialkyl) -hexene and cyclization is carried out at a reaction temperature of 120 to 250 ° C.
【０００８】[0008]
【作用】原料たる５−（ｐ−ジアルキル）−ヘキセン
は、エチルパラキシレンの１，３−ブタジエンによる側
鎖アルキル化、ｐ−ジアルキルベンゼンへのヘキサジェ
ンによる核アルキル化等いかなる方法で得られたものも
使用することができる。アルキル基の種類は、テトラリ
ンの用途によって異なるが、製造の容易性、製造コスト
等から考えれば、メチル基が製造し易い。The starting material, 5- (p-dialkyl) -hexene, is obtained by any method such as side chain alkylation of ethyl paraxylene with 1,3-butadiene and nuclear alkylation of p-dialkylbenzene with hexagen. Can also be used. Although the type of the alkyl group varies depending on the use of tetralin, the methyl group is easy to produce considering the ease of production and the production cost.
【０００９】触媒としては、硫酸、芳香族スルホン酸を
用いる。芳香族スルホン酸としては、例えば、ｐ−トル
エンスルホン酸、キシレンスルホン酸、フェノールスル
ホン酸、ナフタレンスルホン酸等反応系に溶解すること
が必要で、イオン交換樹脂等不均一系触媒は、この発明
では排除される。触媒の添加量は、多いほど環化反応が
進み易いが、多すぎるとピッチ状生成物が増大し好まし
くない。通常は、５−（ｐ−ジアルキル）−ヘキセンに
対して０．５〜２０％が望ましい。As the catalyst, sulfuric acid or aromatic sulfonic acid is used. As the aromatic sulfonic acid, for example, p-toluenesulfonic acid, xylenesulfonic acid, phenolsulfonic acid, naphthalenesulfonic acid, etc. need to be dissolved in the reaction system. Will be eliminated. The larger the amount of the catalyst added, the easier the cyclization reaction proceeds, but if it is too large, pitch-like products increase, which is not preferable. Usually, 0.5 to 20% is desirable based on 5- (p-dialkyl) -hexene.
【００１０】環化反応は、溶媒の存在ないしは不存在
下、減圧、常圧または加圧下で、反応温度１２０℃以上
で実施する。反応温度が１２０℃未満の場合は、反応速
度が遅く、また、高すぎるとピッチ状生成物発生の原因
となるので、好ましくは１４０〜２２０℃の範囲であ
る。環化反応は、回分式、連続式のいずれでも良い。The cyclization reaction is carried out in the presence or absence of a solvent, under reduced pressure, normal pressure or increased pressure, at a reaction temperature of 120 ° C. or higher. When the reaction temperature is lower than 120 ° C, the reaction rate is slow, and when it is too high, pitch-like products are generated, so the temperature is preferably in the range of 140 to 220 ° C. The cyclization reaction may be a batch system or a continuous system.
【００１１】５−（ｐ−ジアルキル）−ヘキセンの環化
反応は、一般のフェニルヘキセンの環化反応やアルキル
ベンゼンのオレフィンによるアルキル化反応などに比較
し、均一系触媒を使用してさえ上記のように過酷な条件
を必要とする。その理由は、生成物である１，４−ジメ
チル−５，８−ジアルキルテトラリンの１位と８位、４
位と５位二つのペリ位のアルキル基相互の立体障害によ
るものと思われる。The cyclization reaction of 5- (p-dialkyl) -hexene is compared with the general cyclization reaction of phenylhexene and the alkylation reaction of alkylbenzene with olefin, and the above-mentioned reaction is performed even when a homogeneous catalyst is used. Require harsh conditions. The reason is that 1-position and 8-position of 1,4-dimethyl-5,8-dialkyltetralin which is a product, 4
This is probably due to steric hindrance between the two alkyl groups at the 2nd and 5th positions.
【００１２】環化反応に供する原料である５−（ｐ−ジ
アルキル）−ヘキセンは、高純度品である必要はなく、
前記したエチル−ｐ−キシレンの１，３−ブタジエンに
よる側鎖アルキル化後の反応液をそのまま、あるいは水
洗等によって触媒を除去した後、未反応物や副生物を除
去することなく、あるいは除去したのち、環化反応に供
することができる。環化反応の途中で軽沸点分が発生す
るときは、系外に抜出しながら行うのが反応温度を所定
温度に保持するため必要となる場合がある。反応終了後
は、触媒を中和、水洗あるいは濾過等により除去したの
ち、蒸留等の手段によって容易に高純度の１，４−ジメ
チル−５，８−ジアルキルテトラリンを９５％以上の高
収率で得ることができる。The starting material for the cyclization reaction, 5- (p-dialkyl) -hexene, need not be a highly pure product.
The reaction solution after the side chain alkylation of ethyl-p-xylene with 1,3-butadiene as described above is used, or after removing the catalyst by washing with water or the like, the unreacted materials and by-products are not removed or removed. After that, it can be subjected to a cyclization reaction. When a light boiling point is generated in the middle of the cyclization reaction, it may be necessary to perform it while extracting it outside the system in order to keep the reaction temperature at a predetermined temperature. After completion of the reaction, the catalyst is removed by neutralization, washing with water, filtration or the like, and then high-purity 1,4-dimethyl-5,8-dialkyltetralin can be easily obtained with a high yield of 95% or more by means such as distillation. Obtainable.
【００１３】[0013]
実施例１ ５−（ｐ−キシリル）−ヘキセン１８８ｇ、ｐ−トルエ
ンスルホン酸・１水和物１０ｇを３００ｍｌのガラス製
フラスコに仕込み、攪拌しながら１６０℃で３時間環化
反応せしめた。反応終了後ｐ−トルエンスルホン酸と等
モルの苛性ソーダ水溶液で中和して分液し、１８４ｇの
１，４，５，８−テトラメチルテトラリンを得た。１，
４，５，８−テトラメチルテトラリンの反応収率は、９
８％であった。Example 1 188 g of 5- (p-xylyl) -hexene and 10 g of p-toluenesulfonic acid monohydrate were placed in a 300 ml glass flask and cyclized at 160 ° C. for 3 hours while stirring. After completion of the reaction, the solution was neutralized with an aqueous solution of caustic soda in an equimolar amount to p-toluenesulfonic acid and separated to obtain 184 g of 1,4,5,8-tetramethyltetralin. 1,
The reaction yield of 4,5,8-tetramethyltetralin is 9
It was 8%.
【００１４】実施例２ ５−（ｐ−キシリル）−ヘキセンを３０％含有する反応
液５００ｇ、ｐ−トルエンスルホン酸５ｇを１０００ｍ
ｌのガラス製フラスコに仕込んで加熱し、環化反応温度
が２００℃になるまで軽沸点分を留出せしめたのち、２
００℃で２時間環化反応せしめた。反応終了後４０℃ま
で冷却し、ｐ−トルエンスルホン酸を水洗除去したの
ち、精密蒸留し１，４，５，８−テトラメチルテトラリ
ン１４５ｇを得た。１，４，５，８−テトラメチルテト
ラリンの収率は、９６．７％であった。Example 2 500 g of a reaction solution containing 30% of 5- (p-xylyl) -hexene and 1000 g of 5 g of p-toluenesulfonic acid.
It was charged in a glass flask of 1 l and heated to distill light boiling components until the cyclization reaction temperature reached 200 ° C, and then 2
The cyclization reaction was carried out at 00 ° C. for 2 hours. After completion of the reaction, the mixture was cooled to 40 ° C., p-toluenesulfonic acid was washed off with water, and then precision distilled to obtain 145 g of 1,4,5,8-tetramethyltetralin. The yield of 1,4,5,8-tetramethyltetralin was 96.7%.
【００１５】実施例３ ５−（ｐ−キシリル）−ヘキセンを３０％含有する反応
液５００ｇ、濃度９６％の硫酸５ｇを１０００ｍｌのガ
ラス製フラスコに仕込んで加熱し、環化反応温度が２０
０℃になるまで軽沸点分を留出せしめたのち、２００℃
で２時間環化反応せしめた。反応終了後４０℃まで冷却
し、ｐ−トルエンスルホン酸を水洗除去したのち、精密
蒸留して１，４，５，８−テトラメチルテトラリン１４
３．３ｇを得た。１，４，５，８−テトラメチルテトラ
リンの収率は、９５．５％であった。Example 3 500 g of a reaction solution containing 30% of 5- (p-xylyl) -hexene and 5 g of sulfuric acid having a concentration of 96% were placed in a 1000 ml glass flask and heated to a cyclization reaction temperature of 20.
After distilling the light boiling point until it reaches 0 ℃, 200 ℃
The cyclization reaction was carried out for 2 hours. After completion of the reaction, the mixture was cooled to 40 ° C., p-toluenesulfonic acid was washed off with water, and then precision distilled to obtain 1,4,5,8-tetramethyltetralin 14
3.3 g was obtained. The yield of 1,4,5,8-tetramethyltetralin was 95.5%.
【００１６】実施例４ ５−（ｐ−キシリル）−ヘキセン１００ｇ、フェノール
スルホン酸１ｇを２００ｍｌのガラス製フラスコに仕込
み、２２０℃で１時間環化反応せしめた。反応終了後水
２０ｇを添加してフェノールスルホン酸を溶解、分液
し、９７．５ｇの１，４−ジメチル−５，８−ジエチル
テトラリンを得た。１，４−ジメチル−５，８−ジエチ
ルテトラリンの収率は、９７．５％であった。Example 4 100 g of 5- (p-xylyl) -hexene and 1 g of phenolsulfonic acid were placed in a 200 ml glass flask and cyclized at 220 ° C. for 1 hour. After the completion of the reaction, 20 g of water was added to dissolve the phenolsulfonic acid and the layers were separated to obtain 97.5 g of 1,4-dimethyl-5,8-diethyltetralin. The yield of 1,4-dimethyl-5,8-diethyltetralin was 97.5%.
【００１７】比較例 ５−（ｐ−キシリル）−ヘキセン１８８ｇ、ｐ−トルエ
ンスルホン酸・１水和物１０ｇを３００ｍｌのガラス製
フラスコに仕込み、攪拌しながら１００℃で３時間環化
反応せしめた。反応終了後ｐ−トルエンスルホン酸と等
モルの苛性ソーダ水溶液で中和して分液したが、１，
４，５，８−テトラメチルテトラリンは全く得られなか
った。Comparative Example 188 g of 5- (p-xylyl) -hexene and 10 g of p-toluenesulfonic acid monohydrate were placed in a 300 ml glass flask and cyclized at 100 ° C. for 3 hours with stirring. After completion of the reaction, the solution was neutralized with an aqueous solution of caustic soda having an equimolar amount to that of p-toluenesulfonic acid and separated.
No 4,5,8-tetramethyltetralin was obtained.
【００１８】[0018]
【発明の効果】以上述べたとおり、この発明方法によれ
ば、触媒として硫酸またはｐ−トルエンスルホン酸を使
用し、反応温度１２０〜２５０℃に保持することによっ
て、５−（ｐ−ジアルキル）−ヘキセンの環化を高収率
で達成することができる。As described above, according to the method of the present invention, by using sulfuric acid or p-toluenesulfonic acid as a catalyst and maintaining the reaction temperature at 120 to 250 ° C., 5- (p-dialkyl)- Cyclization of hexene can be achieved in high yield.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 武田 享一 茨城県鹿島郡鹿島町大字光３番地 住金化 工株式会社鹿島工場内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Kouichi Takeda, No. 3, Hikari, Oshima, Kashima-cho, Kashima-gun, Ibaraki Prefecture Sumitomo Chemical Co., Ltd. Kashima Plant
Claims (3)
媒として硫酸および／または芳香族スルホン酸を添加
し、温度１２０℃以上で環化処理することを特徴とする
１，４−ジメチル−５，８−ジアルキルテトラリンの製
造方法。1. 1,4-Dimethyl-5, which comprises adding sulfuric acid and / or aromatic sulfonic acid as a catalyst to 5- (p-dialkyl) -hexene and subjecting it to cyclization at a temperature of 120 ° C. or higher. , 8-Dialkyltetralin production method.
載の１，４−ジメチル−５，８−ジアルキルテトラリン
の製造方法。2. The method for producing 1,4-dimethyl-5,8-dialkyltetralin according to claim 1, wherein the alkyl group is a methyl group.
ン酸である請求項１および２記載の１，４−ジメチル−
５，８−ジアルキルテトラリンの製造方法。3. A 1,4-dimethyl-group according to claim 1, wherein the aromatic sulfonic acid is p-toluenesulfonic acid.
A method for producing 5,8-dialkyltetralin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17177392A JP3200470B2 (en) | 1992-06-05 | 1992-06-05 | Method for producing alkyltetralin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17177392A JP3200470B2 (en) | 1992-06-05 | 1992-06-05 | Method for producing alkyltetralin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05339176A true JPH05339176A (en) | 1993-12-21 |
| JP3200470B2 JP3200470B2 (en) | 2001-08-20 |
Family
ID=15929416
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17177392A Expired - Lifetime JP3200470B2 (en) | 1992-06-05 | 1992-06-05 | Method for producing alkyltetralin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3200470B2 (en) |
-
1992
- 1992-06-05 JP JP17177392A patent/JP3200470B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP3200470B2 (en) | 2001-08-20 |
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