JPS57200362A - Preparation of indoxyl - Google Patents
Preparation of indoxylInfo
- Publication number
- JPS57200362A JPS57200362A JP8556681A JP8556681A JPS57200362A JP S57200362 A JPS57200362 A JP S57200362A JP 8556681 A JP8556681 A JP 8556681A JP 8556681 A JP8556681 A JP 8556681A JP S57200362 A JPS57200362 A JP S57200362A
- Authority
- JP
- Japan
- Prior art keywords
- indoxyl
- hydroxide
- salt
- heating medium
- organic solvent
- 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.)
- Granted
Links
Abstract
PURPOSE: To obtain indoxyl useful as an intermediate for indigo dyes, industrially and advantageously without using any alkali hydroxide, by reacting an N- phenylglycine salt with an alkali metallic amide in the presence of an inert high- boiling organic solvent.
CONSTITUTION: An N-phenylglycine salt, e.g. sodium or/and potassium salt, is reacted with an alkali metallic amide in the presence of an inert high-boiling organic solvent having a boiling point ≥180°C, preferably ≥200°C, preferably a usually available heating medium, e.g. an alkylnaphthalene heating medium, to give the aimed indoxyl in high yield without using potassium hydroxide and/or sodium hydroxide at all under mild conditions. After the completion of the reaction, the resultant product is dissolved in water, and the aqueous layer is separated to recover the solvent and circulated for reuse. The resultant indoxyl is oxidized to afford an indigo of high quality in high yield.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8556681A JPS57200362A (en) | 1981-06-05 | 1981-06-05 | Preparation of indoxyl |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8556681A JPS57200362A (en) | 1981-06-05 | 1981-06-05 | Preparation of indoxyl |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57200362A true JPS57200362A (en) | 1982-12-08 |
JPH0224817B2 JPH0224817B2 (en) | 1990-05-30 |
Family
ID=13862356
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8556681A Granted JPS57200362A (en) | 1981-06-05 | 1981-06-05 | Preparation of indoxyl |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57200362A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004058898A1 (en) * | 2002-12-25 | 2004-07-15 | Beijing Wisdom Yingli Pharmaceutical Technology Developing Co., Ltd. | A process for dyeing directly a textile fabric in situ |
US7718690B2 (en) | 2002-11-28 | 2010-05-18 | Venkata Satya Nirogi Ramakrishna | N-arylsulfonyl-3-aminoalkoxyindoles |
-
1981
- 1981-06-05 JP JP8556681A patent/JPS57200362A/en active Granted
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7718690B2 (en) | 2002-11-28 | 2010-05-18 | Venkata Satya Nirogi Ramakrishna | N-arylsulfonyl-3-aminoalkoxyindoles |
WO2004058898A1 (en) * | 2002-12-25 | 2004-07-15 | Beijing Wisdom Yingli Pharmaceutical Technology Developing Co., Ltd. | A process for dyeing directly a textile fabric in situ |
Also Published As
Publication number | Publication date |
---|---|
JPH0224817B2 (en) | 1990-05-30 |
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