CH120257A - Process for the preparation of a new oxynaphthalene carboxylic acid. - Google Patents
Process for the preparation of a new oxynaphthalene carboxylic acid.Info
- Publication number
- CH120257A CH120257A CH120257DA CH120257A CH 120257 A CH120257 A CH 120257A CH 120257D A CH120257D A CH 120257DA CH 120257 A CH120257 A CH 120257A
- Authority
- CH
- Switzerland
- Prior art keywords
- sep
- new
- acid
- oxynaphthalene
- carboxylic acid
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/15—Preparation of carboxylic acids or their salts, halides or anhydrides by reaction of organic compounds with carbon dioxide, e.g. Kolbe-Schmitt synthesis
Description
Verfahren zur Darstellung einer neuen Ogynaplitalinkarbonsäure. Es wurde gefunden, dass durch Einwir kung von Kohlensäure auf ss-Naphtholkalium bei höheren Temperaturen,; zweckmässig über etwa<B>170'</B> C, sich eine neue Oxynaphthalin- harbonsäure als Hauptprodukt bildet, wel- eher nach wissenschaftlicher Untersuchung die folgende Formel zukommt:
EMI0001.0011
Die neue Säure bildet in trockenem Zu stande ein weisses Pulver, ist uniersetzt sublimierbar und löslich in heissem Wasser und den meisten organischen Lösungsmitteln, mit Eisenchlorid entsteht in wässeriger Lö sung eine dunkelbraune Färbung. Die ver dünnte Lösung des Natronsalzes zeigt starke blaue Fluoreszenz.
Beispiel 182 Teile von scharf getrocknetem ss- Naphtholkalium werden in einem Autoklaven unter Druck während acht Stunden bei etwa 170 bis 230 C mit Kohlensäure be handelt.
Nach dem Erkalten; scheidet man aus der wässerigen Lösung der Reaktions masse zunächst das ss-Naphthol ab und trennt darauf die erhaltene 2 - Oxynaphthalin - 6 - karbonsäure auf Grund ihrer leichteren Lös lichkeit in heissem Wasser von der gleich zeitig entstandenen 2-Oxynaphthalin-3-kar- bonsäure. Auf diese Weise erhält man 68 Teile 2-Oxynaphthalin-6-karbonsäure.
Die 2-Oxynaphthalin-6-karbonsäure löst sich leicht in den meisten organischen Lö sungsmitteln und kristallisiert aus heissem Wasser oder verdünnter Essigsäure in farb losen Blättchen, welche in vollständig rei nem Zustande bei 245 C (unkorr.) schmel zen. Sie soll als Zwischenprodukt zur Her stellung von Farbstoffen Verwendung finden.
Process for the preparation of a new ogynaplitalin carboxylic acid. It has been found that by exposure to carbonic acid at elevated temperatures, β-naphthol; appropriately above about <B> 170 '</B> C, a new oxynaphthalenedic acid is formed as the main product, which, according to scientific research, has the following formula:
EMI0001.0011
When dry, the new acid forms a white powder, can be sublimated and is soluble in hot water and most organic solvents; with ferric chloride, an aqueous solution produces a dark brown color. The diluted solution of the sodium salt shows strong blue fluorescence.
Example 182 parts of sharply dried ss-naphthol potassium are treated with carbonic acid in an autoclave under pressure for eight hours at about 170 to 230.degree.
After cooling down; the ss-naphthol is first separated from the aqueous solution of the reaction mass and the 2-oxynaphthalene-6-carboxylic acid obtained is then separated from the 2-oxynaphthalene-3-carboxylic acid which is formed at the same time due to its easier solubility in hot water . In this way, 68 parts of 2-oxynaphthalene-6-carboxylic acid are obtained.
The 2-oxynaphthalene-6-carboxylic acid dissolves easily in most organic solvents and crystallizes from hot water or dilute acetic acid in colorless flakes, which melt in a completely pure state at 245 C (uncorrupted). It should be used as an intermediate for the manufacture of dyes.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH120257T | 1926-01-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH120257A true CH120257A (en) | 1927-05-16 |
Family
ID=4379138
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH120257D CH120257A (en) | 1926-01-25 | 1926-01-25 | Process for the preparation of a new oxynaphthalene carboxylic acid. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH120257A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4329494A (en) * | 1981-07-22 | 1982-05-11 | American Cyanamid Company | Recycling techniques in the production of 6-hydroxy-2-naphthoic acid |
-
1926
- 1926-01-25 CH CH120257D patent/CH120257A/en unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4329494A (en) * | 1981-07-22 | 1982-05-11 | American Cyanamid Company | Recycling techniques in the production of 6-hydroxy-2-naphthoic acid |
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