Process for preparing pure substituted...

Details Process for preparing pure substituted... Process for preparing pure substituted...

B - Operations, Transporting

01

J

260/508.1, 260/4

B01J 27/00 (2006.01) B01J 31/04 (2006.01)

Patent

CA 1069131

Abstract of the Disclosure: 2,5-diarylamino terephthalates are obtained in good yields and excel- lent purity when the aromatic nitro compound used for oxidizing the corre- sponding dihydro-2,5-diarylamino terephthalate contains the aromatic radi- cal of said diarylamino groups, i.e. when the amine formed during the oxi- dation is that from which said diarylamino groups derive. The products yield vary pure quinacridone pigments and allow the sythesis of only one isomer of substituted quinacridones.

261873

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