CN1101060A - Preparation of Di- or triarylmethane dyes by oxidation - Google Patents

Preparation of Di- or triarylmethane dyes by oxidation Download PDF

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CN1101060A
CN1101060A CN93114187A CN93114187A CN1101060A CN 1101060 A CN1101060 A CN 1101060A CN 93114187 A CN93114187 A CN 93114187A CN 93114187 A CN93114187 A CN 93114187A CN 1101060 A CN1101060 A CN 1101060A
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phenyl
hydrogen
alkyl
hydrogen peroxide
group
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CN1047605C (en
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T·格斯纳
U·迈耶
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Nuofuang Ip Group Co
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BASF SE
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Priority to DE4211783A priority Critical patent/DE4211783A1/en
Priority to DE59306714T priority patent/DE59306714D1/en
Priority to EP93105082A priority patent/EP0568806B1/en
Priority to JP5080597A priority patent/JPH0625544A/en
Priority to CN93114187A priority patent/CN1047605C/en
Application filed by BASF SE filed Critical BASF SE
Publication of CN1101060A publication Critical patent/CN1101060A/en
Priority to US08/615,065 priority patent/US5659053A/en
Priority claimed from US08/615,065 external-priority patent/US5659053A/en
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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09BORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B11/00Diaryl- or thriarylmethane dyes
    • C09B11/02Diaryl- or thriarylmethane dyes derived from diarylmethanes
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09BORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B11/00Diaryl- or thriarylmethane dyes
    • C09B11/04Diaryl- or thriarylmethane dyes derived from triarylmethanes, i.e. central C-atom is substituted by amino, cyano, alkyl
    • C09B11/10Amino derivatives of triarylmethanes
    • C09B11/12Amino derivatives of triarylmethanes without any OH group bound to an aryl nucleus
    • C09B11/18Preparation by oxidation

Abstract

The method for preparation of 2 or 3 aryl-methane dye is that the 2 or 3 aryl-methane oxidizing reaction is conducted under the existence of attenuant and oxygen transfusion catalyst containing complexed heavy metal ion. Said method includs using hydrogen peroxide, hydrogen peroxide donor compound, organo-hydrogen peroxide or percarboxylic acid as oxidant and using one of the group of porphyrin, tetrahetero annulene, phthalocyanine or tetraheterocycle tetradecane as oxygen transfusion catalyst.

Description

Preparation of Di- or triarylmethane dyes by oxidation
The present invention relates at thinner and contain in the presence of the oxygen transfer catalyst of heavy metal ion of complexing, by two or the oxidizing reaction of triarylmethane prepare two or the novel method of triarylmethane dye.
JP-A-74530/1978 discloses at mantoquita for example in the presence of copper sulfate (II) or the cupric chloride, prepares triarylmethane dye with the oxidizing reaction of triarylmethane and hydrogen peroxide.In addition, JP-A-57848/1981 disclose with hydrogen peroxide, chloranil, and metallic compound for example cupric bromide (I) or vanadium pentoxide carry out the method for oxidizing reaction.
According to the embodiment of JP-A-57848/1981, in the presence of iron(ic) chloride (II), manganous sulfate (II) and ethylenediamine tetraacetic acid (EDTA), triarylmethane that contains carbonyl and oxygen generation oxidizing reaction as oxygenant generate 2-benzo [C] furanone.
At last, EP-A-3005397 discloses in the presence of the azoic dyestuff cobalt complex, by make corresponding diarylmethanes generation oxygenizement with hydrogen peroxide, prepares 3, two (4-the dimethylamino phenyl)-6-dimethylaminos of 3--2-benzo [C] furanone.
The method for making that has been found that prior art still has shortcoming, and for example, the method for making of being mentioned is not all to be suitable for for preparation two or triarylmethane dye.
An object of the present invention is to provide the novel method of a kind of preparation two or triarylmethane dye, it is from corresponding two or triarylmethane, and carries out in the presence of the oxygen-transferance catalyzer of the heavy metal ion that contains complexing.This novel method will generate the purpose product with high yield and purity in simple mode.
We have found that purpose of the present invention is carried out a kind of method that oxidation prepares the dyestuff of formula I by the leucocompound with the general formula II and reached,
Figure 931141877_IMG3
In the formula, R 1, R 2, R 3And R 4Be C independently of each other 1The alkyl of-C, this alkyl can be substituted and can form insert phenyl or C with the ether official with 1 to 3 Sauerstoffatom 1-C 4Alkyl phenyl.
R 5And R 6Be hydrogen or methyl independently of each other,
X is hydrogen, replaces or unsubstituted phenyl, or has replaced or unsubstituted naphthyl, and An Be anionic equivalent,
Figure 931141877_IMG5
R wherein 1, R 2, R 3, R 4, R 5, R 6And X each all as defined above.Oxygenizement thinner and contain complexing heavy metal ion the oxygen transfer catalyst in the presence of carry out.This method for making comprises uses hydrogen peroxide, hydrogen peroxide donor compound, organic hydroperoxide or percarboxylic acids as oxygenant with use a member in porphyrin, four azepines [14] (big ring) annulene, phthalocyanine or this group of tetraazacyclododecane decane as the oxygen transfer catalyst.
Any alkyl that appears in formula I and the II can be a straight or branched.
Any alkyl that has replaced that occurs in above-mentioned formula I and II contains following general formula base, for example hydroxyl, chlorine, cyano group, phenyl or hydroxyl sulfonyl-phenyl.
Any substituted-phenyl that occurs in above-mentioned formula I and II can contain following substituting group, methyl for example, chlorine, amino, C 1-C 4-alkylamino, or dialkyl amido, one or diphenyl amino, hydroxyl, C 1-C 4-alkoxyl group or hydroxyl alkylsulfonyl.
Any naphthyl that has replaced that occurs in above-mentioned formula I and II can contain following substituting group, and is for example amino, C 1-C 4-list or dialkyl amido, one or diphenyl amino, or the hydroxyl alkylsulfonyl.
Any alkyl that has replaced that occurs in above-mentioned general formula, phenyl or naphthyl generally is mono-substituted, dibasic or trisubstituted, preferred single replacement or dibasic.
Suitable R 1, R 2, R 3, R 4Group is a methyl for example, ethyl, propyl group; sec.-propyl, butyl, isobutyl-; the second month in a season-butyl, amyl group, isopentyl; neo-pentyl, uncle-amyl group, hexyl; heptyl, octyl group, 2-ethylhexyl; the 2-hydroxyethyl, 2-or 3-hydroxypropyl, 2 or the 4-hydroxybutyl; 2-chloro ethyl, 2-or 3-chloro propyl group, 2-or 4-chloro butyl; the 2-cyano ethyl, 2-or 3-cyano group propyl group, 2-or 4-cyano group butyl; benzyl, 1-or 2-phenylethyl, hydroxyl Sulphonylbenzyl; hydroxyl alkylsulfonyl phenylethyl, 2-methoxy ethyl, 2-ethoxyethyl group; 2-or 3-methoxy-propyl, 2-or 3-ethoxycarbonyl propyl, 2-or 4-methoxyl group butyl; 2-or 4-oxyethyl group butyl, 3,6-Er Evil heptyl; 3,6-Er Evil octyl group, 4; 8-Er Evil nonyl, 3,7-Er Evil octyl group; 3,7-Er Evil nonyl, 4; 7-Er Evil octyl group, 4,7-Er Evil nonyl; 4,8-Er Evil decyl, 5-hydroxyl-3-oxa-amyl group; 5-hydroxyl-1,4 dimethyl-3-oxa-amyl group, 8-hydroxyl-3; 6-Er Evil octyl group or 11-hydroxyl-3,6,9-trioxa undecyl phenyl; 1-, 2-or 3-aminomethyl phenyl or 1-, 2-or 3-ethylphenyl.
Suitable X is a phenyl for example; 2-, 3-or 4-aminomethyl phenyl, 2,4-3,5-dimethylphenyl; 2-, 3-or 4-chlorophenyl, 2,4-or 2; 6-dichloro-phenyl, 2-, 3-, or 4-aminophenyl; 2-, 3-or 4-one or dimethylaminophenyl, 2-; 3-, or 4-one or diphenyl amino phenyl, 2-; 3-or 4-hydroxy phenyl, 2-, 3-or 4-p-methoxy-phenyl; 2,4-Dimethoxyphenyl, 2-; 3-, or 4-hydroxyl alkylsulfonyl phenyl, 2; 4-sulfonyldioxy phenyl, 2,4-sulfonyldioxy-5-hydroxy phenyl; amino naphthyl, one or the dimethylamino naphthyl, one or diphenyl amino naphthyl or hydroxyl alkylsulfonyl naphthyl.
Suitable negatively charged ion is for example fluorine, chlorine, bromine, iodine, bisulfate ion, sulfate radical, tetrafluoro is for borate, formate, acetate moiety, propionate, one, two, or three chloro acetate moietys, lactate, methoxyacetic acid root, citrate, amber acid radical, methylsulphonic acid root, Phenylsulfonic acid root and 2-or 4-toluene sulfonic acide root.
When the dyestuff of formula I has the hydroxyl alkylsulfonyl, and be form with salt when existing, suitable counter ion is metal or ammonium ion.Metal ion is lithium, sodium or potassium ion particularly.Ammonium ion for the object of the invention, or that replaced or unsubstituted ammonium cation, the ammonium cation that has replaced be for example-alkyl-, dialkyl group-, trialkyl-, tetraalkyl or benzyl trialkyl ammonium positively charged ion, or by nitrogenous five or the resulting positively charged ion of hexa-atomic saturated heterocyclic compound, tetramethyleneimine for example, piperidines, morpholine, piperazine or N-alkylpiperazine positively charged ion or their N-monoalkyl or N, N-dialkyl group substitution product.Alkyl herein is interpreted as general straight or branched C 1-C 20Alkyl.They can be replaced by hydroxyl, and/or form ether functional group with the Sauerstoffatom insertion.
Sodium and potassium ion are preferred.
R wherein preferably 5And R 6Each is the preparation method of hydrogen, formula I dyestuff.
The preferred R that also has wherein 1, R 2, R 3, and R 4Each is to have replaced or unsubstituted C 1-C 4The C that-alkyl, particularly hydroxyl or hydroxyl alkylsulfonyl phenyl replace 1-C 4The preparation method of the formula I dyestuff of-alkyl.
Particularly preferably be wherein X and be hydrogen or replaced or the preparation method of the formula I dyestuff of the phenyl that unsubstituted phenyl, particularly chloro-or hydroxyl alkylsulfonyl replace.
The particularly preferred R that also has wherein 1, R 2, R 3And R 4Each is C 1-C 4-alkyl, C 2-C 4The preparation method of the formula I dyestuff of-hydroxyalkyl or hydroxyl Sulphonylbenzyl.
That should be mentioned that especially is R in the formula I 1And R 3Every kind is ethyl, R 2And R 4Every kind is the hydroxyl Sulphonylbenzyl, R 5And R 6Every kind is hydrogen, and X is the preparation method of the dyestuff of the phenyl that replaces of hydroxyl alkylsulfonyl.
That should be mentioned that especially is R in the formula I 1And R 3Every kind is ethyl, R 2And R 4Every kind is the hydroxyl Sulphonylbenzyl, R 5And R 6Every kind is hydrogen, and X is the preparation method of the dyestuff of the phenyl that replaces of hydroxyl alkylsulfonyl.
Shifting oxygen and containing the suitable catalyzer of complexation heavy metal ion is a member in porphyrin, four azepines [14] annulene, phthalocyanine pigment or this group of tetraazacycloalkane for example.
This heavy metal ion of complexing obtain by for example iron, manganese, cobalt or chromium, this heavy metal ion generally is 2-or 3-valency.
This compounds is early known, and is described in for example DE-A-2427606, WO-A-91/01985, and Kontakte 1985,38, or Chem.Lett.1991, in 1217.
They are consistent with for example following general formula:
Porphyrin:
Figure 931141877_IMG6
P 1=hydrogen, methyl, ethyl, chlorine, or bromine
P 2, P 3, P 4, P 5=hydrogen, methyl, hydroxyl alkylsulfonyl or C 1-C 4-alkoxyl group
M=iron, manganese, cobalt or chromium.
Four azepines [14] (big ring) annulene:
Figure 931141877_IMG7
L 1=hydrogen, C 1-C 8-alkyl, chlorine, C 1-C 4-alkoxyl group, replace or unsubstituted phenyl, replace or unsubstituted phenylazo C 1-C 4-alkoxyl group hydroxyl, or unsubstituted or use C 1-C 4Alkyl, hydroxyl, C 1-C 4The pyridine that-alkoxyl group hydroxyl or formamyl replace.
L 2, L 3=hydrogen, methyl, perhaps L 2And L 3Simultaneously=condensed benzo ring M=iron, manganese, cobalt or chromium
Phthalocyanine (dyestuff):
Figure 931141877_IMG8
Q 1, Q 2=C 1-C 4-alkyl, chlorine, bromine, C 1-C 4-alkoxyl group, or Q 1And Q 2Together=a kind of condensed benzo ring
M=iron, manganese, cobalt or chromium
Tetraazacyclododecane four decane:
An =a kind of anionic equivalent
M=iron, manganese, cobalt or chromium
Preferably use four azepines [14] (big ring) annulene or phthalocyanine pigment class as catalyzer.
Preferred also have use to contain the catalyzer of chelated iron ion.
Particularly preferred iron four azepines [14] (big ring) annulene or the iron-phthalocyanine (dyestuff) of being to use is as catalyzer.
Very particularly preferably be to use iron-5,14-dihydro-dibenzo [b, i] [5,9,14,18] four azepines [14]-(big ring) annulene or iron-phthalocyanine (dyestuff) are as catalyzer.
This catalyzer can use in solution equably or heterogeneously.Equally, they can be fixed on solid support material for example on silica gel or the ion exchange resin.
The oxygenant of Shi Yonging is a hydrogen peroxide in the methods of the invention, hydrogen peroxide donor compound, organic hydroperoxide or percarboxylic acids.
The hydrogen peroxide donor compound that is suitable for is for example alkali metal perborate or percarbonate.
The organic hydroperoxide that is suitable for is for example cumene hydroperoxide or alkyl hydroperoxide, particularly tertbutyl peroxide.
The percarboxylic acids that is suitable for is a peracetic acid for example, m-chloro benzoic acid, and two (monoperoxyphthalic acid) magnesium hexahydrate, and 1,12-12 diperacids.
It is preferred using hydrogen peroxide, tertbutyl peroxide or two (monoperoxyphthalic acid) magnesium hexahydrate.
If use hydrogen peroxide, generally be to use with the aqueous solution form of 10-70% weight concentration as oxygenant.
Organic hydroperoxide generally is to use with the form of about 70% weight concentration aqueous solution.
Two (monoperoxyphthalic acid) magnesium hexahydrate can use by solid form, as the aqueous solution or as aq suspension.
In some cases, this method for making is preferably in the compound that also has in addition a small amount of (calculate with the leucocompound II, generally be for up to 2 moles of %) can stablize this oxygenant carries out under existing, and this compound is an ethylenediamine tetraacetic acid (EDTA) for example, diethylenetriamine pentaacetic acid, nitrilotriacetic acid(NTA), β-An Jibingsuan oxalic acid, isoserine oxalic acid, ethylenediamine tetraacetic (methylene phosphonic acid), hexamethylene-diamine four (methylene phosphonic acid), Diethylenetriamine five (methylene phosphonic acid) or its alkaline metal salt, trimethylacetic acid, right-toluenesulphonic acids, water glass, acetate, Sodium Fluoride, cyanamide or xitix and/or certain nitrogenous aromatic heterocycle, imidazoles for example, the N-Methylimidazole, pyridine, pyrazoles, the pyrroles, or 1,3, the 4-triazole.
Leucocompound with respect to every mole of general formula III, the consumption of this oxygenant generally is by 1 to 5 mole, preferably by 1.5 to 4 moles, special preferably by 1.5 to 2.5 moles hydrogen peroxide, by 0.9 to 3 mole, be preferably by 1 to 2 mole, be preferably organic hydroperoxide especially by 1 to 1.5 mole, perhaps by 0.9 to 3 mole, preferred 1 to 2 mole percarboxylic acids (in each case, all be as the criterion calculate) with the peroxycarboxylic acidic group.
The general consumption of oxygen conveying person catalyzer that contains the heavy metal ion of complexing is to be that benchmark calculates by 1 to 3 mole of each percentage number average of % with the leucocompound II preferably by 0.1 to 5 mole of %.
Suitable thinner is a water for example, Glacial acetic acid, and chloroform, toluene, N, dinethylformamide, N-Methyl pyrrolidone, alcohols is methyl alcohol for example, ethanol, propyl alcohol, Virahol, butanols, isopropylcarbinol, di-alcohols is ethylene glycol for example, propylene glycol or its mixture.
Preferably make water, or water and Glacial acetic acid, the mixture of alcohols or di-alcohols.
Making water is particularly preferred as thinner.
Two-phase mixture for example by water and difficult and the miscible resulting mixture of solvent of water, also can provide with phase-transfer catalyst.The phase transition catalyzer that is suitable for is known commerical prod itself, as quaternary alkylammonium halides, or benzyl trialkyl ammonium halide, or hydrosulfate.
This novel method for making generally is under barometric point and at 20 to 100 ℃, preferably carries out under 40 to 90 ℃.It not only can carry out continuously, and may be carried out batchwise.
The method for making that this is novel is preferably undertaken by leucocompound II and thinner are added as initial admixture, and general, the weight ratio of leucocompound II and thinner is by 1: 10 to 2: 1, is preferably 3: 7 to 3.2.Add catalyzer then, subsequently, under thoroughly stirring, oxygenant or its aqueous solution are metered in the mixture.Then, under said temperature, oxidizing reaction takes place under agitation.
After oxygenant adds, this reaction generally promptly is through with, the temperature of reaction mixture is risen to 20-80 ℃, and restir 10-120 minute thereupon, isolate target product according to common mode then, for example, remove and desolvate to doing, or saltout with sodium sulfate, and if necessary, once more dissolving and again carry out reprecipitation.
Method for making of the present invention be simple, and can obtain high yield and highly purified general formula II dyestuff.In addition, the superior part of this novel method for making is that also oxygenant does not contain heavy metal, and the reaction times is short.
The dyestuff of this formula I is applicable to paper is dyeed and the environmental health protection.
The present invention will do more detailed explanation in the mode of embodiment.
Embodiment 1
To the 96.3g(50 mmole) 40% weight concentration 4; 4 " in the aqueous solution of two [N-ethyl-N-(3-hydroxyl Sulphonylbenzyl) amino] triphenyl methane-2-sulfonate sodium; add the 0.34g(1 mmole) iron-5; 14-dihydro-dibenzo [b; i] [5; 9; 14; 18] four azepines [14] (big ring) annulene, the 0.44g(1 mmole) ethylenediamine tetraacetic (methylene phosphonic acid) and 0.08g(1 mmole) the N-Methylimidazole, then; under vigorous stirring; under 80 ℃, in 25 minutes, drip the 11.4g(100 mmole) the aqueous hydrogen peroxide solution of 30% weight concentration.Reaction mixture is cooled to after 60 ℃,, filters then solution restir 1 hour.Filtrate is adjusted to PH4 with sodium hydroxide solution.Remove and anhydrate, dry thereupon, obtain the 43.5g dyestuff.
Embodiment 2
To the 96.3g(50 mmole) 40% weight concentration 4 '; 4 " in two [N-ethyl-N-(3-hydroxyl Sulphonylbenzyl) amino] triphenyl methane-2-sulfonate sodium aqueous solution; add the 0.34g(1 mmole) iron-5; 14-dihydro-dibenzo [b; i] [5; 9; 14,18] four azepines [14] (big ring) annulene, 0.28g(1 mmole) ethylenediamine tetraacetic acid (EDTA) and 0.08g(1 mmole) the N-Methylimidazole; then; at 40 ℃, in 25 minutes, under vigorous stirring; drip the 9.66g(75 mmole) tertbutyl peroxide (70% weight concentration, the aqueous solution).Reaction mixture 40 ℃ of following restir 1 hour, is filtered then.This solution is adjusted to PH4 with sodium hydroxide solution, removes and anhydrates, and is dry then, obtains the dyestuff of 45.3g.
Embodiment 3
To the 96.3g(50 mmole) 40% weight concentration 4 '; 4 " in two [N-ethyl-N-(3-hydroxyl Sulphonylbenzyl) amino] triphenyl methane-2-sulfonate sodium aqueous solution; add the 0.34g(1 mmole) iron-5; 14-dihydro-dibenzo [b; i] [5; 9; 14; 18] four azepines [14] (big ring) annulene; then, at 90 ℃, in 25 minutes; under vigorous stirring, drip the 24.19g(45 mmole in 200ml water) the solution of two (a peroxidation phthalic acid) magnesium hexahydrates (85% weight concentration).Reaction mixture is cooled to after 60 ℃, and restir 1 hour filters then.Add sodium sulfate to salt out dyestuff.Isolate precipitation while hot from water, dye-resin is dissolved in the water, this solution is adjusted to PH4 with sodium hydroxide solution, remove and to anhydrate, dry thereupon, obtain the salt dyestuff that contains of 52.8g.
The method for making of previous embodiment also can be used for the following leucocompound of oxidation general formula.
Figure 931141877_IMG11
Figure 931141877_IMG12

Claims (5)

1, a kind of method for preparing the formula I dyestuff
Figure 931141877_IMG1
In the formula, R 1, R 2, R 3And R 4Be C independently of each other 1-C 8Alkyl, this alkyl can be substituted and can insert with 1 to 3 Sauerstoffatom becomes ether functional group, phenyl or C 1-C 4Alkyl phenyl,
R 5And R 6Be hydrogen or methyl independently of each other,
X is hydrogen, replaces or unsubstituted phenyl, or has replaced or unsubstituted naphthyl, and
An -Be the negatively charged ion equivalent,
In this method for making, be the R with wherein 1, R 2, R 3, R 4, R 5, R 6And each of X is all as the leucocompound of above-mentioned defined general formula II
Thinner and contain complexing heavy metal ion the oxygen transfer catalyst in the presence of, carry out oxidizing reaction, it comprises uses hydrogen peroxide, hydrogen peroxide donor compound, organic hydroperoxide or percarboxylic acids as oxygenant with use a member in porphyrin, four azepines [14] (big ring) annulene, phthalocyanine pigment or this group of tetraazacyclododecane decane as the oxygen transfer catalyst.
2, a kind of method for making according to claim 1, wherein, R 5And R 6Every kind is hydrogen.
3, a kind of method for making according to claim 1, wherein, R 1, R 2, R 3And R 4Every kind is to have replaced or unsubstituted alkyl.
4, a kind of method for making according to claim 1, wherein, X is a hydrogen, or has replaced or unsubstituted phenyl.
5, a kind of method for making according to claim 1, wherein, the heavy metal ion of complexing is obtained by iron, manganese, cobalt or chromium in the oxygen transfer catalyst.
CN93114187A 1992-04-08 1993-09-27 Preparation of Di- or triarylmethane dyes by oxidation Expired - Fee Related CN1047605C (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE4211783A DE4211783A1 (en) 1992-04-08 1992-04-08 Process for the preparation of di- or triarylmethane dyes by oxidation
EP93105082A EP0568806B1 (en) 1992-04-08 1993-03-27 Method for producing diarylmethane or triarylmethane dyestuffs by oxidation
DE59306714T DE59306714D1 (en) 1992-04-08 1993-03-27 Process for the preparation of di- or triarylmethane dyes by oxidation
JP5080597A JPH0625544A (en) 1992-04-08 1993-04-07 Production of di- and triarylmethane dye
CN93114187A CN1047605C (en) 1992-04-08 1993-09-27 Preparation of Di- or triarylmethane dyes by oxidation
US08/615,065 US5659053A (en) 1992-04-08 1996-03-13 Preparation of Di- or triarylmethane dyes by oxidation

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Application Number Priority Date Filing Date Title
DE4211783A DE4211783A1 (en) 1992-04-08 1992-04-08 Process for the preparation of di- or triarylmethane dyes by oxidation
CN93114187A CN1047605C (en) 1992-04-08 1993-09-27 Preparation of Di- or triarylmethane dyes by oxidation
US08/615,065 US5659053A (en) 1992-04-08 1996-03-13 Preparation of Di- or triarylmethane dyes by oxidation

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CN112111170A (en) * 2019-06-21 2020-12-22 上海泰初化工技术有限公司 Preparation method of triarylmethane color development material

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JP6501689B2 (en) * 2015-10-01 2019-04-17 公立大学法人大阪府立大学 Process for producing di- and triarylmethane dyes

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JPS525746A (en) * 1975-07-03 1977-01-17 Kanzaki Paper Mfg Co Ltd Novel process for preparation of triarymethane derivatives

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* Cited by examiner, † Cited by third party
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CN112111170A (en) * 2019-06-21 2020-12-22 上海泰初化工技术有限公司 Preparation method of triarylmethane color development material

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