JPH01168634A - Production of bis(4-hydroxyphenyl)-cyclohexane - Google Patents

Production of bis(4-hydroxyphenyl)-cyclohexane

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Publication number
JPH01168634A
JPH01168634A JP32720287A JP32720287A JPH01168634A JP H01168634 A JPH01168634 A JP H01168634A JP 32720287 A JP32720287 A JP 32720287A JP 32720287 A JP32720287 A JP 32720287A JP H01168634 A JPH01168634 A JP H01168634A
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JP
Japan
Prior art keywords
cyclohexane
hydroxyphenyl
catalyst
formula
catalysts
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
Application number
JP32720287A
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Japanese (ja)
Other versions
JP2516233B2 (en
Inventor
Toru Miura
徹 三浦
Teruyuki Nagata
永田 輝幸
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.)
Mitsui Toatsu Chemicals Inc
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Mitsui Toatsu Chemicals Inc
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Priority to JP62327202A priority Critical patent/JP2516233B2/en
Publication of JPH01168634A publication Critical patent/JPH01168634A/en
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  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)

Abstract

PURPOSE:To efficiently obtain the title compound useful as a raw material for polymers, intermediate for medicines, etc., from an inexpensive and industrially readily available raw material, by subjecting tetrakis(4-hydroxyphenyl)- cyclohexane to decomposition reaction without using a hydrogen acceptor. CONSTITUTION:A compound expressed by formula I [two benzene rings (a) are linked to the same carbon atom on the cyclohexane ring] is subjected to decomposition reaction in the presence of a base or acid catalyst, especially strong basic catalyst, such as sodium hydroxide, at 100-400 deg.C, preferably 150-300 deg.C temperature without using a hydrogen acceptor to industrially and advantageously afford the aimed compound expressed by formula II. Furthermore, the above-mentioned reaction can be carried out in higher yield under milder conditions by the coexistence of a hydrogen transfer catalyst in the afore-mentioned reaction system. The above-mentioned raw material is obtained by reacting cyclohexanedione prepared by reducing the corresponding dihydroxybenzene, etc., with phenol in the presence of a catalyst.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、ビス(4−ヒドロキシフェニル)−シクロヘ
キサンの製造方法に関する。さらに詳細には式(1) (式中、2つのベンゼン環(a)は、同一のシクロヘキ
サン環炭素と結合、)で示されるテトラキス(4〜ヒド
ロキシフエニル)−シクロヘキサンを水素受容体を使用
せずに分解反応させることを特徴とする式(ff) で示されるビス(4−ヒドロキシフェニル)−シクロヘ
キサンの製造方法に関する。
DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for producing bis(4-hydroxyphenyl)-cyclohexane. More specifically, tetrakis(4-hydroxyphenyl)-cyclohexane represented by formula (1) (wherein, two benzene rings (a) are bonded to the same cyclohexane ring carbon) using a hydrogen acceptor. The present invention relates to a method for producing bis(4-hydroxyphenyl)-cyclohexane represented by formula (ff), which is characterized in that the decomposition reaction is carried out without decomposition reaction.

ビス(4−ヒドロキシフェニル)−シクロヘキサンはポ
リマー原料あるいは医薬中間体等として有用な化合物で
ある。
Bis(4-hydroxyphenyl)-cyclohexane is a compound useful as a polymer raw material or a pharmaceutical intermediate.

〔従来の技術〕[Conventional technology]

フェノールと1.3−シクロヘキサジエンを触媒存在下
に反応させて、1.4−ビス(4−ヒドロキシフェニル
)−シクロヘキサンを得ることは知られている(英国特
許1122372(’68)等)。
It is known to react phenol and 1,3-cyclohexadiene in the presence of a catalyst to obtain 1,4-bis(4-hydroxyphenyl)-cyclohexane (UK Patent No. 1,122,372 ('68), etc.).

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

しかし上記従来法においては原料として用いる1、3−
シクロヘキサジエンが高価であり、工業的に入手も困難
であり、有利な方法とは言い難い。
However, in the above conventional method, the 1,3-
Cyclohexadiene is expensive and difficult to obtain industrially, so it cannot be called an advantageous method.

〔問題を解決する為の手段〕[Means to solve the problem]

本発明者等は、安価な工業的に入手可能な原料を用いた
ビス(4−ヒドロキシフェニル)−シクロヘキサンの製
造方法につき鋭意検討し本発明に到達した。
The present inventors have conducted extensive studies on a method for producing bis(4-hydroxyphenyl)-cyclohexane using inexpensive industrially available raw materials, and have arrived at the present invention.

即ち、本発明は式(I) (式中、2つのベンゼン環(a)は、同一のシクロヘキ
サン環炭素に結合。)で示されるテトラキス(4−ヒド
ロキシフェニル)−シクロヘキサンを水素受容体を使用
せずに分解反応させることを特徴とする式(n) で示されるビス(4−ヒドロキシフェニル)−シクロヘ
キサンの製造方法である。
That is, the present invention provides tetrakis(4-hydroxyphenyl)-cyclohexane represented by formula (I) (wherein, two benzene rings (a) are bonded to the same cyclohexane ring carbon) using a hydrogen acceptor. This is a method for producing bis(4-hydroxyphenyl)-cyclohexane represented by formula (n), which is characterized in that the decomposition reaction is carried out without decomposition reaction.

本発明に於いて原料として使用されるテトラキス(4−
ヒドロキシフェニ)−シクロヘキサンは、例えば特開昭
56−55328に記載されているようなシクロヘキサ
ンジオンとフェノールを触媒存在下に反応させることに
より得ることができる。
Tetrakis (4-
Hydroxyphenylene)-cyclohexane can be obtained, for example, by reacting cyclohexanedione and phenol in the presence of a catalyst as described in JP-A-56-55328.

また、シクロヘキサジオンは対応するジヒドロキシベン
ゼン、卯ちカテコール、レゾルシン、ハイドロキノンの
還元、あるいはシクロヘキサンジオールの酸化等により
得ることができる。
Further, cyclohexadione can be obtained by reduction of the corresponding dihydroxybenzene, unicatechol, resorcinol, hydroquinone, or oxidation of cyclohexanediol.

本発明は、このようにして得られる弐(1)のテトラキ
ス(4−ヒドロキシフェニル)−シクロヘキサンを水素
受容体を使用せずに分解反応させることにより、式(I
I)のビス(4−ヒドロキシフェニル)−シクロヘキサ
ンを得るものであり、安価で工業的に入手が容易なジヒ
ドロキシベンゼン(カテコール、レゾルシン、ハイドロ
キノン)とフェノールより効率的に目的生成物を得るこ
とができる。
In the present invention, the formula (I
I) Bis(4-hydroxyphenyl)-cyclohexane is obtained, and the desired product can be obtained more efficiently than dihydroxybenzene (catechol, resorcinol, hydroquinone) and phenol, which are inexpensive and easily available industrially. .

この分解反応は次の様に進行する。1.1,4.4−テ
トラキス(4−ヒドロキシフェニル)−シクロヘキサン
(■°)を例に挙げて説明すると以下のようになる。
This decomposition reaction proceeds as follows. The following is an explanation using 1.1,4.4-tetrakis(4-hydroxyphenyl)-cyclohexane (■°) as an example.

(B)           (n’)即ち、式(ビ)
化合物が分解されて弐(A)で示される中間体となり、
この化合物(A)が不均化反応を起こして、通常約2=
1で目的の(■”)と副生物(B)となる。この不均化
反応は、水素移動反応であるので、水素移動触媒の使用
により、温和な条件で反応を進めることが好ましい。
(B) (n'), that is, formula (Bi)
The compound is decomposed to become the intermediate shown by (A),
This compound (A) causes a disproportionation reaction, usually about 2=
In step 1, the target (■'') and by-product (B) are obtained. Since this disproportionation reaction is a hydrogen transfer reaction, it is preferable to proceed with the reaction under mild conditions by using a hydrogen transfer catalyst.

また、反応系に水素移動触媒と水素受容体を加えること
により、(B)の4.4’−ジヒドロキシターフェニル
のみを効率よく製造できることを本発明者らは別に提案
したが、本発明方法においては、水素受容体を使用しな
い。水素受容体の使用は(B)のみへの反応を増し、目
的の(■゛)の収率が低下する。
In addition, the present inventors have separately proposed that only 4,4'-dihydroxyterphenyl (B) can be efficiently produced by adding a hydrogen transfer catalyst and a hydrogen acceptor to the reaction system, but in the method of the present invention, does not use hydrogen acceptors. The use of a hydrogen acceptor increases the reaction to only (B) and reduces the yield of the desired (■゛).

分解反応においては塩基又は酸触媒が使用される。効率
的な分解用触媒は、水酸化ナトリウム、水酸化カリウム
、水酸化リチウム等の如きアルカリ金属水酸化物、水酸
化マグネシウム、水酸化バリウム等の如きアルカリ土類
金属水酸化物、炭酸塩、酢酸塩、フェノキシト、有機弱
酸の塩を包含する。
Base or acid catalysts are used in the decomposition reaction. Efficient decomposition catalysts include alkali metal hydroxides such as sodium hydroxide, potassium hydroxide, lithium hydroxide, etc., alkaline earth metal hydroxides such as magnesium hydroxide, barium hydroxide, etc., carbonates, acetic acid, etc. salts, phenoxides, and salts of weak organic acids.

また酸類としては、P−トルエンスルホン酸の如き、酸
、亜硫酸水素カリウムの如き弱酸性の酸塩、塩化アルミ
ニウム、塩化第一すず及びその他の酸性金属塩化物が包
含される。
Examples of acids include acids such as P-toluenesulfonic acid, weakly acidic acid salts such as potassium bisulfite, aluminum chloride, stannous chloride, and other acidic metal chlorides.

特に好ましい触媒は、水酸化ナトリウム等の強塩基性触
媒である。その使用量は通常、式(1)のテトラキス(
4−ヒドロキシフェニル)−シクロヘキサンに対し通常
0.1〜40重量%、好ましくは1〜20重量%の範囲
である。
Particularly preferred catalysts are strongly basic catalysts such as sodium hydroxide. The amount used is usually tetrakis (
The amount is usually 0.1 to 40% by weight, preferably 1 to 20% by weight based on 4-hydroxyphenyl)-cyclohexane.

本発明方法は水素移動触媒なしでも実施できるが、水素
移動触媒を共存させることにより、より高収率で、また
より温和な条件で実施できる。
The method of the present invention can be carried out without a hydrogen transfer catalyst, but by coexisting with a hydrogen transfer catalyst, it can be carried out in higher yields and under milder conditions.

水素移動触媒は公知のものなら特に限定されないが、例
えば、ラネーニッケル、還元ニッケル、ニッケルを珪藻
土、アルミナ、軽石、シリカゲル、酸性白土などの種々
の担体に担持したニッケル担体触媒、ラネーコバルト、
還元コバルト、コバルト−担体触媒などのコバルト触媒
、ラネー銅、還元銅、銅−担体触媒などの銅触媒、パラ
ジウム黒、酸化パラジウム、コロイドパラジウム、パラ
ジウム−炭素、パラジウム−硫酸バリウム、パラジウム
−酸化マグネシウム、パラジウム−酸化カルシウム、パ
ラジウム−アルミナなどのパラジウム触媒、白金黒、コ
ロイド白金、酸化白金、硫化白金、白金−炭素のどの白
金−担体触媒等の白金触媒、コロイドロジウム、ロジウ
ム−炭素、酸化ロジウムなどのロジウム触媒、ルテニウ
ム触媒などの白金族触媒、七酸化ニレニウム、レニウム
−炭素などのレニウム触媒、銅クロム酸化物触媒、酸化
モリブデン触媒、酸化バナジウム触媒、酸化タングステ
ン触媒、銀触媒などが挙げられる。
Hydrogen transfer catalysts are not particularly limited as long as they are known, but examples include Raney nickel, reduced nickel, nickel supported catalysts in which nickel is supported on various carriers such as diatomaceous earth, alumina, pumice, silica gel, and acid clay, Raney cobalt,
Cobalt catalysts such as reduced cobalt, cobalt-supported catalysts, copper catalysts such as Raney copper, reduced copper, copper-supported catalysts, palladium black, palladium oxide, colloidal palladium, palladium-carbon, palladium-barium sulfate, palladium-magnesium oxide, Palladium catalysts such as palladium-calcium oxide, palladium-alumina, platinum catalysts such as platinum black, colloidal platinum, platinum oxide, platinum sulfide, platinum-carbon supported platinum catalysts, colloidal rhodium, rhodium-carbon, rhodium oxide, etc. Examples include platinum group catalysts such as rhodium catalysts and ruthenium catalysts, rhenium catalysts such as nyrenium heptoxide and rhenium-carbon, copper chromium oxide catalysts, molybdenum oxide catalysts, vanadium oxide catalysts, tungsten oxide catalysts, and silver catalysts.

これらの触媒の内ではパラジウム触媒等白金族触媒が好
ましい、これらの水素移動触媒の使用割合は、前記−最
大(1)で表されるテトラキス(4−ヒドロキシフェニ
ル)−シクロヘキサン1モルに対し前記触媒の金属原子
として通常0.001〜0.2グラム原子、好ましくは
0.002〜0.01グラム原子の範囲である。
Among these catalysts, platinum group catalysts such as palladium catalysts are preferable.The usage ratio of these hydrogen transfer catalysts is as follows: - Maximum ratio of the above catalyst to 1 mole of tetrakis(4-hydroxyphenyl)-cyclohexane represented by (1). The metal atom is usually in the range of 0.001 to 0.2 gram atom, preferably 0.002 to 0.01 gram atom.

反応温度は100〜400℃、好ましくは150〜30
0℃の範囲で実施するのが良い0反応温度が低い場合は
反応速度が小さく、高い場合は副反応が起こり得策では
ない。
The reaction temperature is 100-400°C, preferably 150-30°C.
It is preferable to carry out the reaction in the range of 0°C. If the reaction temperature is low, the reaction rate is low, and if it is high, side reactions may occur.

本発明方法は気相でも実施することができるが、原料や
生成物の融点が高いので、気相反応の場合は300℃以
上の高温を必要とし、収率、操作性、エネルギー等の面
から液相で実施するのが好ましい、その際、溶媒の存在
下に実施するのが良く、具体的には水のほかエチレング
リコールモノメチルエーテル、エチレングリコールジメ
チルエーテル、ジエチレングリコールモノメチルエーテ
ル、テトラヒドロフラン、ジオキサン、ジプロピルエー
テル、ジフェニルエーテル等のエーテル、エタノール、
イソプロパツール、エチレングリコール、ジエチレング
リコール、トリエチレングリコール、プロピレングリコ
ール等のアルコール、アセトニトリル、プロピオニトリ
ル、ベンゾニトリル等のニトリル、ベンゼン、トルエン
、キシレン、メシチレン、エチルベンゼン、クメン等の
芳香族炭化水素などが挙げられる。
The method of the present invention can be carried out in the gas phase, but since the melting points of the raw materials and products are high, a high temperature of 300°C or higher is required in the case of a gas phase reaction, which is disadvantageous in terms of yield, operability, energy, etc. It is preferable to carry out the process in a liquid phase. In this case, it is preferable to carry out the process in the presence of a solvent. Specifically, in addition to water, ethylene glycol monomethyl ether, ethylene glycol dimethyl ether, diethylene glycol monomethyl ether, tetrahydrofuran, dioxane, and dipropyl ether are used. , ethers such as diphenyl ether, ethanol,
Alcohols such as isopropanol, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, nitriles such as acetonitrile, propionitrile, benzonitrile, aromatic hydrocarbons such as benzene, toluene, xylene, mesitylene, ethylbenzene, cumene, etc. Can be mentioned.

また、スチレン類、フェノール類、ニトロベンゼン、ア
セトンの如き水素受容性の溶媒の使眉は副生の4,4#
−ジヒドロキシクーフェニル類の生成量を高め、その分
ビス(4−ヒドロキシフェニル)−シクロヘキサンの収
率が低下するので好ましくない。
In addition, the use of hydrogen-accepting solvents such as styrenes, phenols, nitrobenzene, and acetone can cause the by-product 4,4#.
This is not preferable because it increases the amount of -dihydroxycuphenyls produced and reduces the yield of bis(4-hydroxyphenyl)-cyclohexane accordingly.

このようにして生成したビス(4−ヒドロキシフェニル
)−シクロへ′キサンは、反応終了後の混合物より水素
移動触媒を分離したのち、酸析や再結晶等の方法で取り
出すことができる。
The bis(4-hydroxyphenyl)-cyclohexane thus produced can be recovered by methods such as acid precipitation and recrystallization after separating the hydrogen transfer catalyst from the mixture after the reaction is completed.

また、本発明方法に於いて、必ず副生ずる4、4”−ジ
ヒドロキシターフェニル類は、式(II)のビス(4−
ヒドロキシフェニル)−シクロヘキサンと、酸性度、溶
解度等が異なるので、pl+を調整して酸析を行うこと
により、あるいは抽出、再結晶を行うことにより分L!
することができ、高純度のビス(4−ヒドロキシフェニ
ル)−シクロヘキサン及び4,4′−ジヒドロキシター
フェニルを得ることができる。
Furthermore, in the method of the present invention, 4,4''-dihydroxyterphenyls, which are always produced as by-products, are bis(4-
Since the acidity, solubility, etc. are different from that of hydroxyphenyl)-cyclohexane, the amount of L!
High purity bis(4-hydroxyphenyl)-cyclohexane and 4,4'-dihydroxyterphenyl can be obtained.

以下、実施例によい本発明を具体的に説明する。Hereinafter, the present invention will be specifically explained with reference to Examples.

〔実施例−1〕 1.4−シクロヘキサンジオンとフェノールを酸触媒下
に反応させて1,1,4.4−テトラキス(4−ヒドロ
キシフェニル)−シクロヘキサンを得た。
[Example-1] 1,1,4,4-tetrakis(4-hydroxyphenyl)-cyclohexane was obtained by reacting 1,4-cyclohexanedione and phenol under an acid catalyst.

このようにして得られた1、1,4.4−テトラキス(
4−ヒドロキシフェニル)−シクロヘキサン45.3g
(0,10モル)、苛性ソーダ2.3g、 5%パラジ
ウム炭素2.3g、水100 dを300 dステンレ
ス製オートクレイプに仕込み、内部を窒素ガスで置換し
たのち190°Cで6時間反応させた。反応終了後、塩
酸水でpH=4とし、結晶を分離した。ついでこの結晶
をメタノールに加熱溶解し、不溶のパラジウム炭素を分
離回収した。メタノールを留去して白色結晶20.4g
を得た。HPLCによる1、4−ビス(4−ヒドロキシ
フェニル)−シクロヘキサンの純度65.1%で不純物
の大部分は4,4“−ジヒドロキシ−p−ターフェニル
であった。純度換算収率49.5%であった。
1,1,4,4-tetrakis (
4-hydroxyphenyl)-cyclohexane 45.3g
(0.10 mol), 2.3 g of caustic soda, 2.3 g of 5% palladium on carbon, and 100 d of water were placed in a 300 d stainless steel autoclave, and after purging the inside with nitrogen gas, they were reacted at 190°C for 6 hours. . After the reaction was completed, the pH was adjusted to 4 with hydrochloric acid and the crystals were separated. The crystals were then heated and dissolved in methanol, and insoluble palladium on carbon was separated and recovered. After distilling off methanol, 20.4g of white crystals were obtained.
I got it. The purity of 1,4-bis(4-hydroxyphenyl)-cyclohexane by HPLC was 65.1%, and most of the impurities were 4,4"-dihydroxy-p-terphenyl. Yield in terms of purity was 49.5%. Met.

〔実施例−2〕 1.3−シクロヘキサンジオンとフェノールから1、L
3,3−テトラキス(4−ヒドロキシフェニル)−シク
ロヘキサンを同様に合成した。次に1.1゜4.4体に
替え、この1.1,3.3体を用いて実施例−1と同様
に反応、処理して1.3−ビス(4−ヒドロキシフェニ
ル)−シクロヘキサン19.9gを得た。
[Example-2] 1, L from 1.3-cyclohexanedione and phenol
3,3-tetrakis(4-hydroxyphenyl)-cyclohexane was similarly synthesized. Next, the 1.1゜4.4 body was replaced with 1.1゜4.4 body, and the 1.1,3.3 body was reacted and treated in the same manner as in Example 1 to produce 1.3-bis(4-hydroxyphenyl)-cyclohexane. 19.9g was obtained.

HPLCによる純度63.9%であり、不純物の大部分
は4.41−ジヒドロキシ−m−ターフェニルであった
The purity was 63.9% by HPLC, and most of the impurities were 4.41-dihydroxy-m-terphenyl.

純度換算収率47.4%であった。The yield in terms of purity was 47.4%.

特許出願人 三井東圧化学株式会社Patent applicant Mitsui Toatsu Chemical Co., Ltd.

Claims (1)

【特許請求の範囲】[Claims] (1)式( I ) ▲数式、化学式、表等があります▼( I ) (式中、2つのベンゼン環(a)は、同一のシクロヘキ
サン環炭素と結合。) で示されるテトラキス(4−ヒドロキシフェニル)−シ
クロヘキサンを水素受容体を使用せずに分解反応させる
ことを特徴とする式(II) ▲数式、化学式、表等があります▼(II) で示されるビス(4−ヒドロキシフェニル)−シクロヘ
キサンの製造方法。
(1) Formula (I) ▲Mathematical formulas, chemical formulas, tables, etc.▼(I) (In the formula, two benzene rings (a) are bonded to the same cyclohexane ring carbon.) Tetrakis (4-hydroxy Bis(4-hydroxyphenyl)-cyclohexane represented by formula (II), which is characterized by decomposition reaction of (phenyl)-cyclohexane without using a hydrogen acceptor. manufacturing method.
JP62327202A 1987-12-25 1987-12-25 Process for producing bis (4-hydroxyphenyl) -cyclohexane Expired - Fee Related JP2516233B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62327202A JP2516233B2 (en) 1987-12-25 1987-12-25 Process for producing bis (4-hydroxyphenyl) -cyclohexane

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62327202A JP2516233B2 (en) 1987-12-25 1987-12-25 Process for producing bis (4-hydroxyphenyl) -cyclohexane

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002062736A1 (en) * 2001-02-08 2002-08-15 Honshu Chemical Industry Co., Ltd. Diphenol and process for producing the same
WO2005061473A1 (en) 2003-12-24 2005-07-07 Sumitomo Chemical Company, Limited Epoxy compounds and cured epoxy resins obtained by curing the compounds
WO2007105809A1 (en) 2006-03-16 2007-09-20 Sumitomo Chemical Company, Limited Method for producing epoxy compound
WO2008130028A1 (en) 2007-04-19 2008-10-30 Sumitomo Chemical Company, Limited Epoxy composition
JP2013256494A (en) * 2012-05-14 2013-12-26 Honshu Chem Ind Co Ltd Process for production of 1,3-bis(4-hydroxyphenyl)cyclohexane

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002062736A1 (en) * 2001-02-08 2002-08-15 Honshu Chemical Industry Co., Ltd. Diphenol and process for producing the same
WO2005061473A1 (en) 2003-12-24 2005-07-07 Sumitomo Chemical Company, Limited Epoxy compounds and cured epoxy resins obtained by curing the compounds
US7538166B2 (en) 2003-12-24 2009-05-26 Sumitomo Chemical Company, Limited Epoxy compounds and cured epoxy resins obtained by curing the compounds
WO2007105809A1 (en) 2006-03-16 2007-09-20 Sumitomo Chemical Company, Limited Method for producing epoxy compound
WO2008130028A1 (en) 2007-04-19 2008-10-30 Sumitomo Chemical Company, Limited Epoxy composition
JP2013256494A (en) * 2012-05-14 2013-12-26 Honshu Chem Ind Co Ltd Process for production of 1,3-bis(4-hydroxyphenyl)cyclohexane

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