DE246079C - - Google Patents
Info
- Publication number
- DE246079C DE246079C DE1911246079D DE246079DA DE246079C DE 246079 C DE246079 C DE 246079C DE 1911246079 D DE1911246079 D DE 1911246079D DE 246079D A DE246079D A DE 246079DA DE 246079 C DE246079 C DE 246079C
- Authority
- DE
- Germany
- Prior art keywords
- boric acid
- leucoquinizarin
- parts
- purpurin
- solution
- 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.)
- Expired - Lifetime
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C50/00—Quinones
- C07C50/26—Quinones containing groups having oxygen atoms singly bound to carbon atoms
- C07C50/34—Quinones containing groups having oxygen atoms singly bound to carbon atoms the quinoid structure being part of a condensed ring system having three rings
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
KAISERLICHESIMPERIAL
PATENTAMTPATENT OFFICE
In der Patentschrift 89027, Kl. 22, ist ein Verfahren zur Darstellung von Leukochinizarin beschrieben, darin bestehend, daß man Purpurin in saurer oder neutraler Lösung mit Reduktionsmitteln behandelt.In the patent 89027, class 22, a method for the preparation of leucoquinizarin is described, consisting in that one purpurin in acidic or neutral solution with Treated reducing agents.
Es wurde nun gefunden, daß man bei diesem Verfahren wesentlich bessere Resultate, besonders in bezug auf Reinheit und Ausbeute, erhalten kann, wenn man die Reduktion mit sauren Mitteln bei Gegenwart von Borsäure ausführt.It has now been found that with this method you get much better results, especially in terms of purity and yield, can be obtained if the reduction Performs with acidic agents in the presence of boric acid.
In eine Lösung von 20 Teilen Purpurin und 7 Teilen Borsäure in 300 Teilen konzentrierter Schwefelsäure trägt man unter gutem Umrühren in kleinen Portionen 5 Teile Aluminiumpulver ein, wobei man Sorge trägt, daß die Temperatur 20 bis 30° nicht übersteigt. Wenn das Purpurin umgewandelt ist, was sich durch die gelbe Farbe der Lösung zu erkennen gibt, wird die Mischung in Eiswasser gegossen, wobei das Leukochinizarin, gegebenenfalls in Form seines Borsäureäthers, sich ausscheidet. Man wäscht nun mit Wasser neutral und trocknet bei niedriger Temperatur. Das so erhaltene Produkt ist wesentlich reiner als das auf gleiche Weise, aber ohne Zusatz von Borsäure hergestellte Leukochinizarin, was sich z. B. schon daraus ergibt, daß man beim Verschmelzen mit ρ-Toluidin Chinizaringrün in. einer um 18 Prozent höheren Ausbeute erhält. An Stelle des Aluminiums können auch andere Metalle, z. B. Zink oder Eisen, verwendet werden.In a solution of 20 parts of purpurin and 7 parts of boric acid in 300 parts more concentrated Sulfuric acid is carried in small portions with 5 parts of aluminum powder while stirring well one, taking care that the temperature does not exceed 20 to 30 °. if the purpurin has been converted, which can be recognized by the yellow color of the solution, the mixture is poured into ice water, the leucoquinizarin, optionally in Form of its boric acid ether. It is now washed neutral and with water dries at low temperature. The product obtained in this way is much purer than the leucoquinizarin produced in the same way but without the addition of boric acid, which is z. B. already results from the fact that when fusing with ρ-toluidine quinizarine green in. an 18 percent higher yield. Instead of aluminum, other metals, e.g. B. zinc or iron is used will.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE246079T | 1911-01-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE246079C true DE246079C (en) |
Family
ID=5934207
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE1911246079D Expired - Lifetime DE246079C (en) | 1911-01-12 | 1911-01-12 |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE246079C (en) |
| FR (1) | FR437970A (en) |
-
1911
- 1911-01-12 DE DE1911246079D patent/DE246079C/de not_active Expired - Lifetime
- 1911-12-21 FR FR437970D patent/FR437970A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR437970A (en) | 1912-05-04 |
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