JPS5515405A - Preparation of 4-alkoxycarbonyl-3, 5-dimethylphthalic anhydride - Google Patents
Preparation of 4-alkoxycarbonyl-3, 5-dimethylphthalic anhydrideInfo
- Publication number
- JPS5515405A JPS5515405A JP8671978A JP8671978A JPS5515405A JP S5515405 A JPS5515405 A JP S5515405A JP 8671978 A JP8671978 A JP 8671978A JP 8671978 A JP8671978 A JP 8671978A JP S5515405 A JPS5515405 A JP S5515405A
- Authority
- JP
- Japan
- Prior art keywords
- concentration
- sulfuric acid
- alkoxycarbonyl
- preparation
- dimethyltrimellitic
- 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
Landscapes
- Furan Compounds (AREA)
Abstract
PURPOSE: To obtain the title compound, an intermediate of prophylactics of arteriosclerosis and thrombosis, easily and in high yield in a short period in one step, by treating 3, 5-dimethyltrimellitic acid trialkyl ester with conc. sulfuric acid.
CONSTITUTION: The title compound is obtained by treating 3, 5-dimethyltrimellitic acid trialkyl ester of the formula (R, R1, R2=lower alkyl) with conc. sulfuric acid of a concentration of ≥80wt%. The yield increases with the concentration. Highly concentrated fuming sulfuric acid should be diluted to a SO3 concentration of ≤120 wt% to prevent the side reations.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53086719A JPS5850993B2 (en) | 1978-07-18 | 1978-07-18 | Method for producing 4↓-alkoxycarbonyl↓-3,5↓-dimethylphthalic anhydride |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53086719A JPS5850993B2 (en) | 1978-07-18 | 1978-07-18 | Method for producing 4↓-alkoxycarbonyl↓-3,5↓-dimethylphthalic anhydride |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5515405A true JPS5515405A (en) | 1980-02-02 |
JPS5850993B2 JPS5850993B2 (en) | 1983-11-14 |
Family
ID=13894679
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP53086719A Expired JPS5850993B2 (en) | 1978-07-18 | 1978-07-18 | Method for producing 4↓-alkoxycarbonyl↓-3,5↓-dimethylphthalic anhydride |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5850993B2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105415568B (en) | 2015-11-17 | 2018-04-17 | 苏州康尼格电子科技股份有限公司 | Low-pressure glue-injection device, low pressure sealing system and low pressure glue sealing method |
WO2017204121A1 (en) | 2016-05-25 | 2017-11-30 | 旭硝子株式会社 | Laminated glass |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3261846A (en) * | 1961-06-30 | 1966-07-19 | Standard Oil Co | Recovery of trimellitic acid product |
-
1978
- 1978-07-18 JP JP53086719A patent/JPS5850993B2/en not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3261846A (en) * | 1961-06-30 | 1966-07-19 | Standard Oil Co | Recovery of trimellitic acid product |
Also Published As
Publication number | Publication date |
---|---|
JPS5850993B2 (en) | 1983-11-14 |
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