Chromogenic dicyanomethylenepyrazolinones

Details Chromogenic dicyanomethylenepyrazolinones Chromogenic dicyanomethylenepyrazolinones

1989-06-08

1990-04-10

Ramsuer, Robert W.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

544 585, 544140, 544371, 546211, 548361, 548364, 548367, C07D23122, C07D23152

Patent

active

049162349

ABSTRACT:
Chromogenic dicyanomethylenepyrazolinone for thermographic recording processes and the corresponding cyanomethylene dyes of the formula ##STR1## in which R is hydrogen, hydroxyl, amino, alkyl, cycloalkyl, aryl, aralkyl or a heterocyclic radical, T.sub.1 and T.sub.2, independently of one another, are each hydrogen, unsubstituted or halogen-, hydroxyl-, cyano- or lower alkoxy-substituted alkyl having a maximum of 12 carbon atoms, cycloalkyl having 5 to 10 carbon atoms or unsubstituted or halogen-, cyano-, lower alkyl- or lower alkoxy-(ring)substituted phenalkyl or phenyl, or T.sub.1 and T.sub.2 together with the nitrogen linking them are a five- or six-membered heterocyclic radical, and rings A and B, independently of one another, are unsubstituted or substituted by halogen, cyano, nitro, lower alkyl, lower alkoxy, (lower alkyl)carbonyl or (lower alkoxy)carbonyl.

REFERENCES:
patent: 4006178 (1977-02-01), Stagi et al.

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