JPS57206670A - Preparation of 2-((2,3-dihydro-2-oxo-5-benzoxazolyl) carbonyl)-benzoic acid alkali metal salt - Google Patents
Preparation of 2-((2,3-dihydro-2-oxo-5-benzoxazolyl) carbonyl)-benzoic acid alkali metal saltInfo
- Publication number
- JPS57206670A JPS57206670A JP8993681A JP8993681A JPS57206670A JP S57206670 A JPS57206670 A JP S57206670A JP 8993681 A JP8993681 A JP 8993681A JP 8993681 A JP8993681 A JP 8993681A JP S57206670 A JPS57206670 A JP S57206670A
- Authority
- JP
- Japan
- Prior art keywords
- metal salt
- benzoic acid
- alkali metal
- benzoxazolyl
- dihydro
- 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 prepare the titled compound useful as an intermediate of indanthrene dye, etc., economically, by reacting 2-(3-amino-4-hydroxybenzoyl)benzoic acid dialkali metal salt with phosgene keeping the pH of the reaction system at a specific level.
CONSTITUTION: An alkali metal salt of 2-[(2,3-dihydro-2-oxo-5-benzoxazolyl) carbonyl]benzoic acid is prepared in high yield and purity, by reacting 2-(3- amino-4-hydroxybenzoyl)-benzoic acid dialkali metal salt with phosgene at 0W 70°C, preferably 10W50°C keeping the pH of the reaction system at about the neutralization point of the phenol group in the alkali metal salt, i.e. ≥9.5pH, preferably 10W14pH.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8993681A JPS57206670A (en) | 1981-06-10 | 1981-06-10 | Preparation of 2-((2,3-dihydro-2-oxo-5-benzoxazolyl) carbonyl)-benzoic acid alkali metal salt |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8993681A JPS57206670A (en) | 1981-06-10 | 1981-06-10 | Preparation of 2-((2,3-dihydro-2-oxo-5-benzoxazolyl) carbonyl)-benzoic acid alkali metal salt |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57206670A true JPS57206670A (en) | 1982-12-18 |
JPS6159629B2 JPS6159629B2 (en) | 1986-12-17 |
Family
ID=13984576
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8993681A Granted JPS57206670A (en) | 1981-06-10 | 1981-06-10 | Preparation of 2-((2,3-dihydro-2-oxo-5-benzoxazolyl) carbonyl)-benzoic acid alkali metal salt |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57206670A (en) |
-
1981
- 1981-06-10 JP JP8993681A patent/JPS57206670A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS6159629B2 (en) | 1986-12-17 |
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