GB828051A - Dihydro-quinacridones and methods of preparing them - Google Patents
Dihydro-quinacridones and methods of preparing themInfo
- Publication number
- GB828051A GB828051A GB22615/56A GB2261556A GB828051A GB 828051 A GB828051 A GB 828051A GB 22615/56 A GB22615/56 A GB 22615/56A GB 2261556 A GB2261556 A GB 2261556A GB 828051 A GB828051 A GB 828051A
- Authority
- GB
- United Kingdom
- Prior art keywords
- heating
- dialkyl
- dihydroquinacridones
- neutralizing
- arylamine
- 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.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B48/00—Quinacridones
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Nitrogen Condensed Heterocyclic Rings (AREA)
Abstract
The invention comprises dihydroquinacridones of the formula <FORM:0828051/IV (b)/1> where R is hydrogen, halogen, or an alkyl or alkoxy group having 1-4 carbon atoms; and their preparation by heating a dialkyl 2,5-diarylamino - 3,6 - dihydroterephthalate under non-oxidizing conditions to effect ring closure. The intermediate dihydroterephthalates may be prepared by adding a dialkyl succinate to a dispersion of a sodium alkoxide in a solvent of boiling-point 240-300 DEG C., heating to form a dialkyl succinyl succinate, neutralizing and heating with an excess of arylamine in the presence of a dissolved acidic catalyst while removing water of condensation under reduced pressure; then by neutralizing, distilling off excess arylamine, introducing an inert gas, and heating the solution in the absence of oxygen to 240-300 DEG C. for 0.75-3 hours, the dihydroquinacridones of the invention are obtained. Specification 828,052 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US828051XA | 1955-07-22 | 1955-07-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB828051A true GB828051A (en) | 1960-02-10 |
Family
ID=22173573
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB22615/56A Expired GB828051A (en) | 1955-07-22 | 1956-07-20 | Dihydro-quinacridones and methods of preparing them |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB828051A (en) |
-
1956
- 1956-07-20 GB GB22615/56A patent/GB828051A/en not_active Expired
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