Substituted 3,6-diaminophthalides

Details Substituted 3,6-diaminophthalides Substituted 3,6-diaminophthalides

1978-09-15

1980-03-04

Trousof, Natalie

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

26032634, 26032613H, 260315, 544 62, 544153, 544376, 546162, 546196, 427151, 428307, 428914, 548159, C07D30783

Patent

active

041916905

ABSTRACT:
Substituted 3,6-diaminophthalides of the formula ##STR1## wherein each of R.sub.1, R.sub.2 and R.sub.3 independently represents alkyl of not more than 12 carbon atoms which is unsubstituted or substituted by halogen, hydroxyl, cyano or lower alkoxy, or represents cycloalkyl, benzyl, or benzyl which is substituted by halogen, lower alkyl or lower alkoxy, and R.sub.1 can also be hydrogen and R.sub.3 can also be phenyl, or R.sub.1 and R.sub.2, together with the nitrogen atom to which they are attached, represent a 5- or 6-membered heterocyclic radical and the ring A is unsubstituted or substituted or contains a fused, unsubstituted or substituted benzene or heterocyclic ring.
These compounds are suitable in particular for use as color formers in pressure-sensitive or heat-sensitive recording materials.

REFERENCES:
patent: 2861082 (1958-11-01), Wheeler et al.
patent: 2886576 (1959-05-01), Wheeler et al.
patent: 2945865 (1960-07-01), Wheeler et al.
patent: 2997481 (1961-08-01), Wheeler et al.
Miyazawa et al. Chem. Abstracts, vol. 85, 1976, 22774n.

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