JPS5740562A - Preparation of beta-crystal phase 6,13-dihydroquinacridone - Google Patents
Preparation of beta-crystal phase 6,13-dihydroquinacridoneInfo
- Publication number
- JPS5740562A JPS5740562A JP11645780A JP11645780A JPS5740562A JP S5740562 A JPS5740562 A JP S5740562A JP 11645780 A JP11645780 A JP 11645780A JP 11645780 A JP11645780 A JP 11645780A JP S5740562 A JPS5740562 A JP S5740562A
- Authority
- JP
- Japan
- Prior art keywords
- crystal phase
- dihydroquinacridone
- formula
- beta
- 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
Abstract
PURPOSE: To obtain the titled compound in high yield, without using expensive solvents, by heating an alkoxycarbonylanilinodihydroacridanone at a specific temperature in an inert gaseous atmosphere.
CONSTITUTION: A 3-alkoxycarbonyl-2-anilino-1,4-dihydro-9-acridanone expressed by formula I (R is alkyl), e.g. a power thereof, is heated in an inert gas, e.g. nitrogen or gaseous carbon dioxide, at 240W350°C, preferably 260W300°C, for 2W 30min to give the aimed compound expressed by formula II. The resultant β-crystal phase 6,13-dihydroquinacridone can be readily converted into the γ-crystal phase quinacridone as a red pigment having improved light, weather, heat and solvent resistance with an ordinary oxidizing agent.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11645780A JPS5740562A (en) | 1980-08-26 | 1980-08-26 | Preparation of beta-crystal phase 6,13-dihydroquinacridone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11645780A JPS5740562A (en) | 1980-08-26 | 1980-08-26 | Preparation of beta-crystal phase 6,13-dihydroquinacridone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5740562A true JPS5740562A (en) | 1982-03-06 |
Family
ID=14687584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11645780A Pending JPS5740562A (en) | 1980-08-26 | 1980-08-26 | Preparation of beta-crystal phase 6,13-dihydroquinacridone |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5740562A (en) |
Cited By (2)
| 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 |
| EP0654472A1 (en) * | 1993-11-19 | 1995-05-24 | Toyo Ink Manufacturing Co., Ltd. | Process for the production of 6,13-dihydroquinacridones and apparatus for use for the production |
-
1980
- 1980-08-26 JP JP11645780A patent/JPS5740562A/en active Pending
Cited By (4)
| 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 |
| US4956464A (en) * | 1987-10-27 | 1990-09-11 | Basf Aktiengesellschaft | Preparation of dihydroquinacridones, quinacridones and quinacridonequinones |
| EP0654472A1 (en) * | 1993-11-19 | 1995-05-24 | Toyo Ink Manufacturing Co., Ltd. | Process for the production of 6,13-dihydroquinacridones and apparatus for use for the production |
| 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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