Heterocyclic substituted fluorans

Details Heterocyclic substituted fluorans Heterocyclic substituted fluorans

C - Chemistry, Metallurgy

07

D

42/3, 260/279.37

C07D 493/10 (2006.01) B41M 5/145 (2006.01) B41M 5/327 (2006.01) C09B 11/24 (2006.01)

Patent

CA 1052381

Heterocyclic substituted Fluorans Abstract of the Disclosure Heterocyclic substituted fluoran compounds of the formula Image wherein R1, R2 and R3 independently of the other, represent hydrogen, alkyl with 1 to 4 carbon atoms, nitro or halogen, or R2 and R3 together complete a condensed carbocyclic ring, X1 and X2 independently of the other, represent hydrogen, alkyl with 1 to 12 carbon atoms, alkenyl with at most 12 carbon atoms, alkoxyalkyl with 2 to 8 carbon atoms, alkoxycarbonylalkyl with 3 to 9 carbon atoms, cycloalkyl with 5 or 6 carbon atoms, acyl having 1 to 12 carbon atoms, or optionally substituted benzyl, phenyl or naphthyl, and the nitrogen ring A represent a heterocyclic radical which optionally includes a further hetero atom as a ring member and the benzene ring B may be further substituted by nitro or 1 to 4 halogen atoms. These fluorans compounds are particu- larly useful as colour formers which give intense dark green, grey black or red colours when they are brought into contact with an electron-accepting co-reactant.

209895

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