Process for preparing pure substituted 2,5-diarylamino-terephtha

Details Process for preparing pure substituted 2,5-diarylamino-terephtha Process for preparing pure substituted 2,5-diarylamino-terephtha

1976-09-22

1978-11-07

Daus, Donald G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

560 45, 560 47, 560 48, 106288Q, 546 49, C07D10168

Patent

active

041247680

ABSTRACT:
2,5-Diarylamino terephthalates are obtained in good yields and excellent purity when the aromatic nitro compound used for oxidizing the corresponding dihydro-2,5-diarylamino terephthalate contains the aromatic radical of said diarylamino groups, i.e. when the amine formed during the oxidation is that from which said diarylamino groups device. The products yield very pure quinacridone pigments and allow the synthesis of only one isomer of substituted quinacridones.

REFERENCES:
patent: 3388149 (1964-01-01), Chi Kang Dien

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