Preparation of mixed crystals and solid solutions of 1, 4-diketo

Details Preparation of mixed crystals and solid solutions of 1, 4-diketo Preparation of mixed crystals and solid solutions of 1, 4-diketo

1996-09-12

1997-12-02

Richter, Johann

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548454, 548465, 548466, 548467, 548512, 548515, 10628721, 106401, 106496, 106498, C07D20952, C07D49102, C09B 1116, C09L 2940

Patent

active

056938241

ABSTRACT:
A process for the preparation of mixed crystals of different compounds of formula ##STR1## by heating a corresponding mixture in solid form to the temperature range from 220.degree. to 380.degree. C.
A and B are, for example, each a group of formula ##STR2## wherein R.sub.1 and R.sub.2 are each independently hydrogen, chloro, bromo, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.6 alkoxy, C.sub.1 -C.sub.6 alkylamino, phenyl or --CN, G is --O--, --NR.sub.7 --, --N.dbd.N-- or --SO.sub.2 --, R.sub.3 and R.sub.4 are hydrogen, and R.sub.7 is hydrogen, methyl or ethyl.
The mixed crystals and solid solutions obtained are excellently suited for pigmenting high molecular weight material.

REFERENCES:
patent: 4783540 (1988-11-01), Babler

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