Organic pigments derived from coumarin

Details Organic pigments derived from coumarin Organic pigments derived from coumarin

1979-08-13

1980-12-23

Randolph, John D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

106309, C07D31108

Patent

active

042409675

ABSTRACT:
This application is directed to compounds which are useful as pigments. The compounds are represented by the formula: ##STR1## where R.sub.1 is hydrogen, alkyl of 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon atoms, chlorine or bromine;

REFERENCES:
patent: 3509177 (1970-04-01), McIntyre
Bassignana et al. Tetrahedron, vol. 20, 1964, pp. 2859-2871.

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