CH135651A - Process for the preparation of 6-bromo-3-amino-2-naphthol. - Google Patents
Process for the preparation of 6-bromo-3-amino-2-naphthol.Info
- Publication number
- CH135651A CH135651A CH135651DA CH135651A CH 135651 A CH135651 A CH 135651A CH 135651D A CH135651D A CH 135651DA CH 135651 A CH135651 A CH 135651A
- Authority
- CH
- Switzerland
- Prior art keywords
- bromo
- amino
- naphthol
- preparation
- formula
- Prior art date
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Darstellung von 6-Brom-3-amino-2-naphthol. Vorliegendes Patent bezieht sich auf ein Verfahren zur Darstellung von 6-Brom- 3-amino-2-naphthol, dadurch gekennzeichnet, dass man o-Arylsulfosäureester des 6-Brom- 2-oxy-3-naphtoesäureamids der Formel:
EMI0001.0009
der Einwirkung von Hypohalogeniten unter wirft und den gebildeten o-Arylsulfosäure- ester des 6-Brom-3-Amino-2-naphthols der 1'ormel
EMI0001.0016
verseift. Das so in vorzüglicher Ausbeute er haltene 6-Brom-3-amino-2-naphthol kristalli siert aus Wasser in farblosen dünnen Blätt chen vom Schmelzpunkt 222' (unkorr.). Der neue Körper soll als Zwischenprodukt zur Herstellung von, Farbstoffen dienen.
<I>Beispiel:</I> Man .löst 266 Teile 6-Brom-2-oxy-3- naphthoesäureamid (erhalten aus 6-Brom-2- oxy-3-naphthoesäurechlorid und Ammoniak in hellgelben Blättchen vom Schmelzpunkt 295 [nicht korrj) in Natronlauge und er hitzt mit 210 Teilen p-Toluolsulfochlorid kurze Zeit zum Kochen.
Das so erhaltene 6-Brom- 2-p-toluolsulfonyl-oxy-3-näphthoesäureamid kristallisiert in Eisessig in farblosen Na deln vom Schmelzpunkt 180 bis 185 (nicht korr.) Daraus erhält man durch Einwirkung einer Natriumhypochloritlösung, entsprechend 71 Teilen .aktiven Chlors, unter Zusatz von 250 Teilen calc.,Soda.,
den 6-B.rom-3-amino-2- naphthol-p-toluolsulfosäureester (farblose Na deln .aus verdünntem Alkohol vom Schmelz punkt 105 nicht korr.1 ), der bei der Ver- seifung 6-Brom-3-amino-2-naphthol ergibt.
Process for the preparation of 6-bromo-3-amino-2-naphthol. The present patent relates to a process for the preparation of 6-bromo-3-amino-2-naphthol, characterized in that o-aryl sulfonic acid esters of 6-bromo-2-oxy-3-naphthoic acid amide of the formula:
EMI0001.0009
the action of hypohalites and throws the o-arylsulfonic acid ester of 6-bromo-3-amino-2-naphthol of the formula formed
EMI0001.0016
saponified. The 6-bromo-3-amino-2-naphthol obtained in this way in excellent yield crystallizes from water in colorless thin leaves with a melting point of 222 '(uncorrupted). The new body should serve as an intermediate product for the production of, dyes.
<I> Example: </I> 266 parts of 6-bromo-2-oxy-3-naphthoic acid amide (obtained from 6-bromo-2-oxy-3-naphthoic acid chloride and ammonia are dissolved in light yellow flakes with a melting point of 295 [not corrj ) in sodium hydroxide solution and heats it to boil for a short time with 210 parts of p-toluenesulfonyl chloride.
The 6-bromo-2-p-toluenesulfonyl-oxy-3-naphthoic acid amide thus obtained crystallizes in glacial acetic acid in colorless needles with a melting point of 180 to 185 (not corr.). with the addition of 250 parts calc., soda.,
the 6-B.rom-3-amino-2-naphthol-p-toluenesulfonic acid ester (colorless needles, made from dilute alcohol with a melting point of 105, not corr. 1), the 6-bromo-3-amino- 2-naphthol yields.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE135651X | 1926-12-24 | ||
CH132311T | 1927-12-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH135651A true CH135651A (en) | 1929-09-30 |
Family
ID=25711820
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH135651D CH135651A (en) | 1926-12-24 | 1927-12-09 | Process for the preparation of 6-bromo-3-amino-2-naphthol. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH135651A (en) |
-
1927
- 1927-12-09 CH CH135651D patent/CH135651A/en unknown
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