1877.1877.
-Klasse-great
. BADISCHE ANILIN- und SODA-FABRIK in MANNHEIM,. BADISCHE ANILINE- and SODA-FACTORY in MANNHEIM,
aromatischen Monäminen.aromatic monamines.
Patentirt im Deutschen,Reiche vom 15. December 1877 -ab.'■''''■;'.■'■ ■ ■'!"; 'Patented in German, Reiche from December 15, 1877 -ab.'■''''■;'. ■ '■ ■ ■'! ";'
Unsere Erfindung bezweckt die Darstellung blauer Farbstoffe, welche sich von tertiärenaromatischen Monäminen und namentlich vom Dimethylanilin ableiten.Our invention aims at the representation of blue dyes, which differ from tertiaryaromatic monamines and in particular from dimethylaniline.
Zu diesem Zweck unterwerfen wir die Paraamidosubstitutionsproducteder tertiären Monamine einer Reaction, Welche im wesentlichen mit derjenigen übereinstimmt, die vor einigerZeit Charles Lauth zur Erzeugung violetter Farbstoffe aus dem Paradiamidobenzol unddessen Homologen angewendet hat. (Bei. d. D. ehem. Ges. 1876, pag. 1035; Bull. soc. chim.1-876 II. sem. pag. 422.)To this end, we subject the para-amido substitution productsof the tertiary monamines of a reaction, which essentially coincides with that which occurred a few years agoTime Charles Lauth for the production of violet dyes from the paradiamidobenzene andwhose homologues have applied. (In. D. D. formerly Ges. 1876, pag. 1035; Bull. Soc. Chim.1-876 II. Sem. p. 422.)
Die Lauth'sche Reaction besteht darin, dafs saure und verdünnte Lösungen von aromatischenDiaminen mit Schwefelwasserstoff und Oxydationsmitteln gleichzeitig behandelt werden. DieseReaction hat indessen bisher keine praktische Verwerthung erlangen können, weil einerseitsdie Erzeugung derartiger violetter Farbstoffe keinem technischen Bedürfnifs entsprioht, undandererseits von der Darstellung des Paradiamidobenzols oder dessen Homologen abhängigist. Genannte Diamine lassen sich bisher bekanntlich nur auf kostspieligen Umwegen gewinnen.Lauth hat ferner bereits angegeben, dafs die nach seiner Methode erzeugten violettenFarbstoffe der Substitution durch Methyl u. s. w. fähig sind und durch dieselbe in blaue odergrüne Farbstoffe übergehen.Lauth's reaction consists in making acidic and dilute solutions of aromaticDiamines are treated with hydrogen sulfide and oxidizing agents at the same time. TheseReaction, however, has not yet been able to achieve any practical use, because on the one handthe production of such violet dyes does not meet any technical need, andon the other hand, it depends on the representation of paradiamidobenzene or its homologuesis. It is well known that the diamines mentioned can only be obtained by expensive detours.Lauth has also already stated that the violet ones produced by his methodDyes of substitution by methyl etc. are capable and by the same in blue orgreen dyes pass over.
Angesichts der vorerwähnten Schwierigkeit, die Lauth'sehen Farbstoffe ökonomisch zu erzeugen,kann man noch viel weniger daran denken, dieselben zum Ausgangspunkt der Darstellungvon Substitutionsderivaten zu erwählen.In view of the aforementioned difficulty in producing Lauth's dyes economically,much less can one think of them as the starting point of the presentationto choose from substitution derivatives.
In derselben Weise nun, in welcher das Dimethylanilin und andere tertiäre Monaminedie directe und praktisch vorteilhafte Darstellung von Farbstoffen gestatten, die früher nurauf dem Umwege der Substitution aus dem Rosomilin zu erlangen waren, bedienen wir unsdes Dimethylanilins und einiger anderer tertiärer Monamine, um in directer und ökonomischerWeise aus denselben blaue Farbstoffe zu erzeugen.In the same way now that dimethylaniline and other tertiary monaminespermit the direct and practically advantageous preparation of dyes which previously onlyWe use the detour of substitution from which rosomilin could be obtainedof dimethylaniline and some other tertiary monamines, in order to be more direct and economicalWay to produce blue dyes from the same.
Im Nachstehenden beschreiben wir zunächst die Darstellung- eines blauen Farbstoffes ausdem Dimethylanilin. Dieselbe zerfallt in drei Operationen:In the following we first describe the representation of a blue dyethe dimethylaniline. It breaks down into three operations:
Erste Operation: Darstellung des Nitroso-Dimethylanilins.First operation: preparation of nitroso-dimethylaniline.
Zweite Operation: Reduction desselben zu Amido-Dimethylanilin.Second operation: reduction of the same to amido-dimethylaniline.
Dritte Operation: Ueberführung des letzteren in den blauen Farbstoff.Third operation: conversion of the latter into the blue dye.
Erste Operation.First operation.
Zur Darstellung des Nitroso-Dimethylanilinsbereiten wir eine kalte Auflösung von
10 kg Dimethylanilin in
30 kg concentrirter Salzsäure und
200 1 Wasser
und lassen in dieselbe eine Auflösung vonTo prepare the nitroso-dimethylaniline, we prepare a cold solution of
 10 kg dimethylaniline in
 30 kg of concentrated hydrochloric acid and
 200 l of water
 and let in it a resolution of
5,7 kg reinem Natriumnitrit (1 Molecul) in 200 1 Wasser5.7 kg of pure sodium nitrite (1 Molecul) in 200 l of water
unter fortwährendem Rühren während vier bis fünf Stunden einlaufen.run in while stirring continuously for four to five hours.
Die Mischung färbt sich gelb und enthält Krystalle und Lösung des salzsauren Nitroso-Dimethylanilins.The mixture turns yellow and contains crystals and a solution of the hydrochloric acid nitroso-dimethylaniline.
Statt des vorerwähnten reinen Natriumnitrits ist selbstverständlich die äquivalente Menge vonfreier salpetriger Säure oder anderer Verbindungen derselben anwendbar.Instead of the above-mentioned pure sodium nitrite, the equivalent amount of is of coursefree nitrous acid or other compounds thereof can be used.
Zweite Operation.Second operation.
Zur Reduction des wie vorstehend erzeugten Nitroso - Dimethylanilins zu Amido - Dimethylanilinkann man sich der üblichen Reductionsmethoden durch feinvertheilte Metalle, wie z. B.Eisen, Zinn oder Zink bedienen. Wir ziehen es indessen vor, den Schwefelwasserstoff zudiesem Zwecke anzuwenden und verfahren in folgender Weise:To reduce the nitroso - dimethylaniline produced as above to amido - dimethylanilineyou can see the usual reduction methods by finely divided metals, such as. B.Use iron, tin or zinc. We prefer, however, to add the hydrogen sulfideapply for this purpose and proceed as follows:
Die, wie vorstehend beschrieben, erhaltene Lösung von salzsaurem Nitroso-Dimethylanilinwird in einem geschlossenen, mit mechanischem Rührwerk und Abzugsvorrichtung für den überschüssigenSchwefelwasserstoff versehenen HoIzfafs mitThe solution of hydrochloric acid nitroso-dimethylaniline obtained as described aboveis in a closed, with mechanical agitator and extraction device for the excessHydrogen sulphide provided wood tanks with
500 1 Wasser und500 1 water and
50 kg concentrirter Salszäure
verdünnt und darauf in dieselbe ein Strom Schwefelwasserstoffgas eingeleitet, bis die gelbeFarbe der Lösung vollständig verschwunden ist.50 kg of concentrated hydrochloric acid
 and then a stream of hydrogen sulfide gas passed into it until the yellow color of the solution has completely disappeared.
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| DE1886Ctrue DE1886C (en) | 1877-12-15 | 
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| DE18771886DExpiredDE1886C (en) | 1877-12-15 | 1877-12-15 | Process for the preparation of blue dyes from dimethylaniline and other tertiary aromatic monamines | 
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| US10537578B2 (en) | 2004-09-23 | 2020-01-21 | Wista Laboratories Ltd. | Medical methods utilising high purity diaminophenothiazinium compounds | 
| US7737138B2 (en) | 2004-09-23 | 2010-06-15 | Wista Laboratories Ltd. | Methods of treatment of a tauopathy condition comprising the use of thioninium compounds | 
| US7790881B2 (en) | 2004-09-23 | 2010-09-07 | Wista Laboratories Ltd. | Methods of chemical synthesis and purification of diaminophenothiazinium compounds including methylthioninium chloride (MTC) | 
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