GB828051A - Dihydro-quinacridones and methods of preparing them - Google Patents

Dihydro-quinacridones and methods of preparing them

Info

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
Application number
GB22615/56A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of GB828051A publication Critical patent/GB828051A/en
Expired legal-status Critical Current

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.
GB22615/56A 1955-07-22 1956-07-20 Dihydro-quinacridones and methods of preparing them Expired GB828051A (en)

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)

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