JPS6434944A - Method for carboxylating substituted phenols - Google Patents
Method for carboxylating substituted phenolsInfo
- Publication number
- JPS6434944A JPS6434944A JP19175687A JP19175687A JPS6434944A JP S6434944 A JPS6434944 A JP S6434944A JP 19175687 A JP19175687 A JP 19175687A JP 19175687 A JP19175687 A JP 19175687A JP S6434944 A JPS6434944 A JP S6434944A
- Authority
- JP
- Japan
- Prior art keywords
- sulfolane
- substituted phenols
- alkaline metal
- solvent
- water
- 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.)
- Pending
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
PURPOSE:To introduce carboxyl group into the o- or p-position, by reacting substituted phenols with an alkaline metal hydroxide using sulfolane as a series of reaction solvents, dehydrating the resultant compound and reacting the dehydration product with CO2. CONSTITUTION:Substituted phenols are reacted with an alkaline metal hydroxide, e.g. NaOH, in a ternary mixed solvent of water, an aromatic hydrocarbon solvent, such as toluene, and sulfolane to form alkaline metal salts of the substituted phenols, which are then dehydrated while azeotropically distilling the mixture of water with the aromatic hydrocarbon, such as toluene. A solution of the alkaline metal salts of the substituted phenols in sulfolane and CO2 gas are subjected to gas-liquid reaction under ordinary or higher pressure and carboxylated to recover the sulfolane solvent from the reaction product by vacuum distillation, etc. After recovering the sulfolane solvent, water is subsequently added and dissolved in the reaction product and crystallization is carried out by adding a mineral acid to afford the aimed aromatic hydroxycarboxylic acid by solid-liquid separation, etc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19175687A JPS6434944A (en) | 1987-07-31 | 1987-07-31 | Method for carboxylating substituted phenols |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19175687A JPS6434944A (en) | 1987-07-31 | 1987-07-31 | Method for carboxylating substituted phenols |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6434944A true JPS6434944A (en) | 1989-02-06 |
Family
ID=16279982
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19175687A Pending JPS6434944A (en) | 1987-07-31 | 1987-07-31 | Method for carboxylating substituted phenols |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6434944A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6392090B1 (en) | 1996-10-02 | 2002-05-21 | Mitsui Chemicals, Inc. | Process for preparing hydroxybenzoic acids |
-
1987
- 1987-07-31 JP JP19175687A patent/JPS6434944A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6392090B1 (en) | 1996-10-02 | 2002-05-21 | Mitsui Chemicals, Inc. | Process for preparing hydroxybenzoic acids |
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