Yellow diketopyrrolopyrrole pigments

Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...

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C07D48704

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active

056727160

ABSTRACT:
##STR1## wherein R.sub.1 and R.sub.2 are each independently of the other hydrogen, halogen, C.sub.1 -C.sub.6 alkyl, cyano or a --OR.sub.3, --COOR.sub.3, --CON(R.sub.3)(R.sub.4), --COR.sub.3 or --N(R.sub.3)(R.sub.4) group, and R.sub.3 and R.sub.4 are each independently of the other hydrogen, C.sub.1 -C.sub.6 alkyl, phenyl which is unsubstituted or substituted by halogen or C.sub.1 -C.sub.6 alkyl. shade having good fastness properties.

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patent: 4720305 (1988-01-01), Iqbal et al.
patent: 4783540 (1988-11-01), Babler
patent: 4810802 (1989-03-01), Wallquist et al.
patent: 5200528 (1993-04-01), Wooden et al.
patent: 5354869 (1994-10-01), Langhals et al.

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