JPS5757749A - Preparation of dihydroquinacridones - Google Patents
Preparation of dihydroquinacridonesInfo
- Publication number
- JPS5757749A JPS5757749A JP13279780A JP13279780A JPS5757749A JP S5757749 A JPS5757749 A JP S5757749A JP 13279780 A JP13279780 A JP 13279780A JP 13279780 A JP13279780 A JP 13279780A JP S5757749 A JPS5757749 A JP S5757749A
- Authority
- JP
- Japan
- Prior art keywords
- dihydroterephthalate
- diarylamino
- dihydroquinacridones
- dibenzyl ether
- preparation
- 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
- Pyridine Compounds (AREA)
Abstract
PURPOSE: To produce dihydroquinacridones in high purity and high yield, by heating 2,5-diarylamino-3,6-dihydroterephthalate in dibenzyl ether.
CONSTITUTION: 2,5-Diarylamino-3,6-dihydroterephthalate of formulaI(where R is lower aliphatic alkyl; X is methyl, chloro, bromo, methoxy, trifluoromethyl, etc.; n is 0, 1, 2; and at least one ortho position adjoining the -NH- group is occupied by hydrogen) is heated in the presence of dibenzyl ether as a solvent at 270W300°C for a short time under atmospheric pressure or reduced pressure to give dihydroquinacridones of formula II. The dibenzyl ether used herein is normally 5W15wt. times, preferably 7W10wt. times as much as the 2,5-diarylamino-3,6-dihydroterephthalate.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13279780A JPS5757749A (en) | 1980-09-26 | 1980-09-26 | Preparation of dihydroquinacridones |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13279780A JPS5757749A (en) | 1980-09-26 | 1980-09-26 | Preparation of dihydroquinacridones |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5757749A true JPS5757749A (en) | 1982-04-07 |
Family
ID=15089781
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13279780A Pending JPS5757749A (en) | 1980-09-26 | 1980-09-26 | Preparation of dihydroquinacridones |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5757749A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0313965A2 (en) * | 1987-10-27 | 1989-05-03 | BASF Aktiengesellschaft | Process for the manufacture of dihydroquinacridones, of quinacridones and of quinacridone quinones |
US5610306A (en) * | 1993-11-19 | 1997-03-11 | Toyo Ink Manufacturing Co., Ltd. | Process for the production of 6,13-dihydroquinacridones and apparatus for use for the production |
US5659036A (en) * | 1993-06-30 | 1997-08-19 | Toyo Ink Manufacturing Co., Ltd. | Process for the production of 2,5-di(arylamino)-3,6-dihydroterephthalic acid dialkyl ester, and process for the production of quinacridone from said ester as intermediate |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5010898A (en) * | 1973-06-04 | 1975-02-04 | ||
JPS52134630A (en) * | 1976-05-04 | 1977-11-11 | Mitsubishi Chem Ind Ltd | Preparation of 6,13-dihydroquinacridone |
-
1980
- 1980-09-26 JP JP13279780A patent/JPS5757749A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5010898A (en) * | 1973-06-04 | 1975-02-04 | ||
JPS52134630A (en) * | 1976-05-04 | 1977-11-11 | Mitsubishi Chem Ind Ltd | Preparation of 6,13-dihydroquinacridone |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0313965A2 (en) * | 1987-10-27 | 1989-05-03 | BASF Aktiengesellschaft | Process for the manufacture of dihydroquinacridones, of quinacridones and of quinacridone quinones |
JPH01143870A (en) * | 1987-10-27 | 1989-06-06 | Basf Ag | Production of dihydroquinacridone, quinacridone and quinacridone quinone |
US5659036A (en) * | 1993-06-30 | 1997-08-19 | Toyo Ink Manufacturing Co., Ltd. | Process for the production of 2,5-di(arylamino)-3,6-dihydroterephthalic acid dialkyl ester, and process for the production of quinacridone from said ester as intermediate |
US5817817A (en) * | 1993-06-30 | 1998-10-06 | Toyo Ink Manufacturing Co., Ltd. | Process for the production of 2,5-di(arylamino)-3,6-dihydroterephthalic acid dialkyl ester, and process for the production of quinacridone from said ester as intermediate |
US5610306A (en) * | 1993-11-19 | 1997-03-11 | Toyo Ink Manufacturing Co., Ltd. | Process for the production of 6,13-dihydroquinacridones and apparatus for use for the production |
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