CH220753A - Process for the preparation of the tetrasulfuric acid ester of the leuco compound of 3.3'-ditrifluoromethylanthraquinone-1.2.2'.1'-azine. - Google Patents
Process for the preparation of the tetrasulfuric acid ester of the leuco compound of 3.3'-ditrifluoromethylanthraquinone-1.2.2'.1'-azine.Info
- Publication number
- CH220753A CH220753A CH220753DA CH220753A CH 220753 A CH220753 A CH 220753A CH 220753D A CH220753D A CH 220753DA CH 220753 A CH220753 A CH 220753A
- Authority
- CH
- Switzerland
- Prior art keywords
- acid ester
- acylamino
- trifluoromethylanthrahydroquinone
- trifluoromethylanthraquinone
- process according
- Prior art date
Links
- 239000002253 acid Substances 0.000 title claims description 7
- 150000001875 compounds Chemical class 0.000 title claims description 7
- 150000002148 esters Chemical class 0.000 title claims description 6
- 238000000034 method Methods 0.000 title claims description 6
- 238000002360 preparation method Methods 0.000 title description 2
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- YADSGOSSYOOKMP-UHFFFAOYSA-N dioxolead Chemical compound O=[Pb]=O YADSGOSSYOOKMP-UHFFFAOYSA-N 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 230000003647 oxidation Effects 0.000 claims description 4
- 238000007254 oxidation reaction Methods 0.000 claims description 4
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 claims description 4
- KEQGZUUPPQEDPF-UHFFFAOYSA-N 1,3-dichloro-5,5-dimethylimidazolidine-2,4-dione Chemical compound CC1(C)N(Cl)C(=O)N(Cl)C1=O KEQGZUUPPQEDPF-UHFFFAOYSA-N 0.000 claims description 3
- XTHPWXDJESJLNJ-UHFFFAOYSA-N chlorosulfonic acid Substances OS(Cl)(=O)=O XTHPWXDJESJLNJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000013078 crystal Substances 0.000 claims description 3
- 238000004043 dyeing Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000007800 oxidant agent Substances 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 2
- 150000001447 alkali salts Chemical class 0.000 claims description 2
- 239000000835 fiber Substances 0.000 claims description 2
- GOJUJUVQIVIZAV-UHFFFAOYSA-N 2-amino-4,6-dichloropyrimidine-5-carbaldehyde Chemical group NC1=NC(Cl)=C(C=O)C(Cl)=N1 GOJUJUVQIVIZAV-UHFFFAOYSA-N 0.000 claims 1
- 125000002252 acyl group Chemical group 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000000243 solution Substances 0.000 description 5
- 239000002244 precipitate Substances 0.000 description 4
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 4
- -1 sulfuric acid ester Chemical class 0.000 description 4
- WFDIJRYMOXRFFG-UHFFFAOYSA-N Acetic anhydride Chemical compound CC(=O)OC(C)=O WFDIJRYMOXRFFG-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 229920000297 Rayon Polymers 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 3
- IVVYRUIEDJJVTN-UHFFFAOYSA-N CC(NC(C(C(F)(F)F)=C1)=CC(C(C2=CC=CC=C22)=O)=C1C2=O)=O Chemical compound CC(NC(C(C(F)(F)F)=C1)=CC(C(C2=CC=CC=C22)=O)=C1C2=O)=O IVVYRUIEDJJVTN-UHFFFAOYSA-N 0.000 description 2
- GVTIFGAYOIWEGS-UHFFFAOYSA-N NC(C(C(F)(F)F)=C1)=CC(C(C2=CC=CC=C22)=O)=C1C2=O Chemical compound NC(C(C(F)(F)F)=C1)=CC(C(C2=CC=CC=C22)=O)=C1C2=O GVTIFGAYOIWEGS-UHFFFAOYSA-N 0.000 description 2
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000002657 fibrous material Substances 0.000 description 2
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002964 rayon Substances 0.000 description 2
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- ZYECOAILUNWEAL-NUDFZHEQSA-N (4z)-4-[[2-methoxy-5-(phenylcarbamoyl)phenyl]hydrazinylidene]-n-(3-nitrophenyl)-3-oxonaphthalene-2-carboxamide Chemical compound COC1=CC=C(C(=O)NC=2C=CC=CC=2)C=C1N\N=C(C1=CC=CC=C1C=1)/C(=O)C=1C(=O)NC1=CC=CC([N+]([O-])=O)=C1 ZYECOAILUNWEAL-NUDFZHEQSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- JLTDJTHDQAWBAV-UHFFFAOYSA-N N,N-dimethylaniline Chemical compound CN(C)C1=CC=CC=C1 JLTDJTHDQAWBAV-UHFFFAOYSA-N 0.000 description 1
- 208000033809 Suppuration Diseases 0.000 description 1
- WSNZLQGGHKYFAZ-UHFFFAOYSA-M [Na+].[O-]S(Cl)(=O)=O Chemical compound [Na+].[O-]S(Cl)(=O)=O WSNZLQGGHKYFAZ-UHFFFAOYSA-M 0.000 description 1
- PASDCCFISLVPSO-UHFFFAOYSA-N benzoyl chloride Chemical compound ClC(=O)C1=CC=CC=C1 PASDCCFISLVPSO-UHFFFAOYSA-N 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- ASKHTHDBINVNFJ-UHFFFAOYSA-N chlorosulfonyloxyethane Chemical compound CCOS(Cl)(=O)=O ASKHTHDBINVNFJ-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 210000002837 heart atrium Anatomy 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 239000012629 purifying agent Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 235000010288 sodium nitrite Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B9/00—Esters or ester-salts of leuco compounds of vat dyestuffs
- C09B9/02—Esters or ester-salts of leuco compounds of vat dyestuffs of anthracene dyes
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Herstellung des Tetraschwefelsäureesters der Leukoverbindung vom 3 . 3'-Ditrifluormethylanthrachinon-1. 2.21. 1'-azin. Es wurde gefunden, dass man den bisher nicht bekannten Tetraschwefelsäureester der Leukoverbindung von 3.3'-Ditrifluormethyl- 1 . 2. 2'.
1'-anthrachinonazin erhält, wenn man 2-Acylamino-3-trifluormethylanthrachinon re duziert und in den 2-Acylamino-3-trifluorme- thylanthrahydrochinon-9 .10 -dischwefelsäure- ester überführt, die N-Acylgruppe abspaltet und den 9.10-Dischwefelsäureester des 2- Amino-3-trifluormethylanthrahydrochinons in alkalischem 1VTedium mit einem Oxydations mittel behandelt.
Die als Ausgangsstoffe benötigten 2-Acyl- amino- 3 - trifluormethylanthrachinone werden zweckmässig aus 2 - Amino - 3 - trifluormethyl- anthrachinon durch Behandeln mit Acylie- rungsmitteln hergestellt.
Zwecks Überführung des 2-Acylamino-3- trifluormethylanthrachinons in den 2-Acyl- amino - 3 - trifluormethylanthrahydrochinon- 9 . 10 - dischwefelsäureester kann 2 - Acyl- amino-3-trifluormethylanthrachinon in Gegen wart einer tertiären Base, wie z. B. Pyridin oder Dimethylanilin und eines SOa liefernden Ver eiterungsmittels, z.
B. von Chlorsulfonsäure, Chlorsulfonsäuremethyl-oder -äthylester, chlor- sulfonsaurem Natrium oder Oleum, mit Metal- len3 z. B. mit Eisen oder Kupfer, behandelt wer den. Die Vereiterung kann auch so erfolgen, dass man zuerst die Leukoverbindung des 2- Acyl - amino - 3 - trifluormethylanthrachinons, z.
B. durch katalytische Reduktion, herstellt, und diese dann mit Schwefeltrioxyd oder einer Schwefeltrioxyd liefernden Verbindung in Gegenwart einer tertiären Base verestert.
Zur Abspaltung des Acylrestes behandelt man den 2-Acylamino-3-trifluormethylanthra- hydrochinon-9 . 10 - dischwefelsäureester mit Alkali, zweckmässig unter Erwärmen.
Die Oxydation des so erhaltenen 2-Ami- no - 3 - trifluormethylanthrahydro chinon - 9. 10- dischwefelsäureesters zum Tetraschwefelsäure- ester des 3,3' . Ditrifluormetliy l-1 . 2 . \?2' . 1'- anthrahydrochinonazins erfolgt durch Einwir kung oxydierender 'Mittel, wie z.
B. von höheren Oxyden des Bleies, N atriumhypo- chlorit oder Ferricy ankalium in alkalischem Medium.
Der so mit guter Ausbeute erhaltene Te- traschwefelsäureester des 3.3'-Ditrifluorme- thyl-1 . \? . 2'. 1'-anthrahy drochinonazins ist in Form seiner Alkalisalze leicht löslich in Wasser. Die Abscheidung der Salze erfolgt in der üblichen Weise.
Der neue Leuko- schwefelsäureester liefert, in üblicher Weise auf den verschiedenen Fasern, beispielsweise Baumwolle, Zellwolle, Viskose, Kunstseide oder andern Faseiinaterialien entwickelt, grün stichig blaue Färbungen oder Drucke, welche sich vor allem durch ihren schönen lebhaften Farbton, verbunden mit guten Echtheitseigen schaften, auszeichnen. Neben der Erzeugung eines äusserst lebhaften Farbtones besitzt der Schwefelsäureester noch die besonders wert volle Eigenschaft, sämtliches Fasermaterial im gleichen Farbton anzufärben.
<I>Beispiel:</I> 10 Gewichtsteile 2-Acetylamino-3-trifluor- methylanthrachinon vom Schmelzpunkt 238 0 C (hergestellt durch Behandeln von 2-Amino-3- trifluormethylanthrachinon mit Essigsäurean- hydrid in 20 0,'oigem Oleum bei 5-10' C) werden bei<B>50'</B> C in eine Mischung von 65 Gewichtsteilen Pyridin und 15 Gewichtsteilen Chlorsulfonsäure eingetragen.
Dann gibt man 8 Gewichtsteile Eisenpulver unter Rühren so langsam zu, dass die Temperatur i0-750 C nicht übersteigt. Ist alles Eisen eingetragen, so lässt man den Ansatz so lange bei 65 0 C nachrühren, bis sich eine Probe klar in Wasser löst. Ist dies der Fall, so lässt man auf 20 0 C abkühlen, gibt den Ansatz in eine Lösung von 30 Gewichtsteilen Natriumcarbonat in 300 Gewichtsteilen Wasser, destilliert das Pyridin bei vermindertem Druck ab und trennt die erhaltene klare wässerige Lösung vom überschüssigen Eisen.
In fester Form wird der so erhaltene Dischwefelsäureester- des 2-Acetylamino-3-trifluormetliyl-anthra- hydrochinons am besten durch Eindampfen obiger Lösung, Ausziehen mit 3lethylalkohol und anschliessender Verdampfung desselben 5o gewonnen. Er ist ein schwach gelb gefärbter Stoff, der sich äussert leicht in Wasser löst; verdünnte wässrige Lösungen zeigen eine intensiv blaue Fluoreszenz. In wohl ausge bildeten Kristallen wird er erhalten, wenn 55 man ihn aus methylalkoliolisclier Lösung durch Zugabe von z. B.
Benzol ausfällt.
Für die Weiterverarbeitung ist eine Iso lierung nicht nötig, sondern man gibt zu obiger Lösung 1.5 Gewichtsteile festes Na- 6o triumhydroxyd und erhitzt so lange auf 90 bis<B>95"</B> C, bis eine angesäuerte Probe im Fluoreszenzlicht reingrün fluoresziert.
Dann kühlt man das Reaktionsprodukt auf 40 0 C ab, gibt 20 Gewichtsteile 48 %ige wässrige 6s Bleidioxydpaste zu, heizt nach einer Stunde auf 50 0 C und nach einer weiteren Stunde auf<B>60'</B> C. Zur vollständigen Oxydation gibt man dann nochmals 10 Clewichtsteile obiger Bleidioxy dpaste zu.
Die Oxydation ist beendet, 70 wenn eine angesäuerte Probe nach der Filtra tion des entstandenen Niederschlages mit Natriumnitrit keine Rotfärbung mehr zeigt. Ist das der Fall, so saugt man vom über schüssigen Bleidioxyd ab und salzt mit festem 75 Kaliumclilorid aus. Das Kaliumsalz des Schwe- felsäureesters des Leuko-3. 3'-ditrifluormethyl- 1. 2 . 2' . 1'-anthrachinonazins scheidet sich in wohlausgebildeten gelben Kristallen ab.
Es löst sich in ZVasser mit intensiv gelb- so grüner Fluoreszenz; beim Stehen im Sonnen licht wird die Lösung zersetzt; auf Zugabe von Säure bildet sich ein in Wasser unlös licher rotvioletter Niederschlag.
An Stelle des 2 - Acetylamino-3-trifluor- s5 methylantlirachinons kann man auch das 2 Benzoylamino - 3 - trifluormethylanthrachinon vom Schmelzpunkt<B>253-2540</B> C (erhältlich durch Erhitzen von 2-Amino-3-trifluormethyl- anthracliinon mit überschüssigem Benzoyl- 9o chlorid zum Sieden) als Ausgangsstoff ver wenden.
Process for the preparation of the tetrasulfuric acid ester of the leuco compound from 3. 3'-Ditrifluoromethylanthraquinone-1. 2.21. 1'-azin. It has been found that the previously unknown tetrasulfuric acid ester of the leuco compound of 3,3'-ditrifluoromethyl-1. 2. 2 '.
1'-anthraquinone azine is obtained when 2-acylamino-3-trifluoromethylanthraquinone is reduced and converted into the 2-acylamino-3-trifluoromethylanthrahydroquinone-9.10-disulfuric acid ester, the N-acyl group is split off and the 9.10-disulfuric acid ester 2- Amino-3-trifluoromethylanthrahydroquinones treated in an alkaline medium with an oxidizing agent.
The 2-acylamino-3-trifluoromethylanthraquinones required as starting materials are expediently prepared from 2-amino-3-trifluoromethylanthraquinone by treatment with acylating agents.
For the purpose of converting the 2-acylamino-3-trifluoromethylanthraquinone into the 2-acylamino-3-trifluoromethylanthrahydroquinone-9. 10 - disulfuric acid ester can 2 - acyl-amino-3-trifluoromethylanthraquinone in the presence of a tertiary base, such as. B. pyridine or dimethylaniline and a SOa supplying Ver purifying agent, z.
B. of chlorosulfonic acid, methyl or ethyl chlorosulfonate, sodium chlorosulfonate or oleum, with metals3 z. B. with iron or copper, treated who the. The suppuration can also take place in such a way that first the leuco compound of 2-acyl-amino-3-trifluoromethylanthraquinone, z.
B. by catalytic reduction, and this is then esterified with sulfur trioxide or a sulfur trioxide supplying compound in the presence of a tertiary base.
To split off the acyl radical, the 2-acylamino-3-trifluoromethylanthraquinone-9 is treated. 10 - disulfuric acid ester with alkali, conveniently with heating.
The oxidation of the 2-amino-3-trifluoromethylanthrahydroquinone-9.10-disulfuric acid ester obtained in this way to the tetrasulfuric acid ester of 3,3 '. Ditrifluoromethyl l-1. 2. \? 2 '. 1'- anthrahydroquinonazins takes place by exposure to oxidizing agents, such as.
B. of higher oxides of lead, N atrium hypochlorite or Ferricy ankalium in an alkaline medium.
The tetrasulfuric acid ester of 3,3'-ditrifluoromethyl-1 obtained in this way with good yield. \? . 2 '. 1'-anthrahy drochinonazins is easily soluble in water in the form of its alkali salts. The salts are separated out in the usual way.
The new leuco-sulfuric acid ester, developed in the usual way on the various fibers, for example cotton, rayon, viscose, rayon or other fiber materials, provides green-tinged blue dyeings or prints, which are mainly characterized by their beautiful, lively hue combined with good fastness properties , distinguish. In addition to producing an extremely lively color, the sulfuric acid ester also has the particularly valuable property of dyeing all fiber material in the same color.
<I> Example: </I> 10 parts by weight of 2-acetylamino-3-trifluoromethylanthraquinone with a melting point of 238 ° C. (produced by treating 2-amino-3-trifluoromethylanthraquinone with acetic anhydride in 20% oleum at 5 -10 'C) are entered at <B> 50' </B> C in a mixture of 65 parts by weight of pyridine and 15 parts by weight of chlorosulfonic acid.
Then 8 parts by weight of iron powder are added slowly with stirring so that the temperature does not exceed 10-750 ° C. Once all of the iron has been added, the batch is left to stir at 65 ° C. until a sample clearly dissolves in water. If this is the case, it is allowed to cool to 20 ° C., the batch is poured into a solution of 30 parts by weight of sodium carbonate in 300 parts by weight of water, the pyridine is distilled off under reduced pressure and the clear aqueous solution obtained is separated from the excess iron.
The disulfuric acid ester of 2-acetylamino-3-trifluoromethyl-anthraquinone obtained in this way is best obtained in solid form by evaporation of the above solution, extraction with methyl alcohol and subsequent evaporation of the same 50. It is a pale yellow colored substance that is extremely easy to dissolve in water; dilute aqueous solutions show an intense blue fluorescence. In well-formed crystals it is obtained when you remove it from methylalkoliolisclier solution by adding z. B.
Benzene precipitates.
For further processing, insulation is not necessary, instead 1.5 parts by weight of solid sodium hydroxide are added to the above solution and heated to 90 to 95 "C until an acidified sample fluoresces pure green in the fluorescent light.
The reaction product is then cooled to 40 ° C., 20 parts by weight of 48% strength aqueous 6s lead dioxide paste are added, and after one hour the mixture is heated to 50 ° C. and after a further hour to 60 ° C. For complete oxidation then another 10 weight parts of the above lead dioxide paste are added.
The oxidation is complete when an acidified sample no longer shows any red color after filtering the resulting precipitate with sodium nitrite. If this is the case, then the excess lead dioxide is sucked off and salted out with solid potassium chloride. The potassium salt of the sulfuric acid ester of Leuko-3. 3'-ditrifluoromethyl-1. 2. 2 '. 1'-anthraquinonazine precipitates in well-formed yellow crystals.
It dissolves in ZVasser with an intensely yellow-green fluorescence; when standing in the sunlight, the solution is decomposed; on addition of acid, a red-violet precipitate which is insoluble in water forms.
Instead of the 2-acetylamino-3-trifluoro-s5 methylantlirachinons, 2-benzoylamino-3-trifluoromethylanthraquinone with a melting point of 253-2540 C (obtainable by heating 2-amino-3-trifluoromethyl anthrachinone Use with excess benzoyl chloride to boiling) as starting material.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE220753X | 1953-07-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH220753A true CH220753A (en) | 1942-04-30 |
Family
ID=5836261
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH220753D CH220753A (en) | 1953-07-22 | 1941-04-28 | Process for the preparation of the tetrasulfuric acid ester of the leuco compound of 3.3'-ditrifluoromethylanthraquinone-1.2.2'.1'-azine. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH220753A (en) |
-
1941
- 1941-04-28 CH CH220753D patent/CH220753A/en unknown
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