5'/6'-Carboxyfluorans and derivatives thereof

Details 5'/6'-Carboxyfluorans and derivatives thereof 5'/6'-Carboxyfluorans and derivatives thereof

1981-07-06

1985-05-07

Fan, Jane T.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548525, C07D31186

Patent

active

045159718

ABSTRACT:
Dialkylamino-substituted 2-anilino-5'/6'-carboxyfluorans, 2-amino and substituted amino-5'/6'-carboxyfluorans, 1,3-dialkyl-5'/6'-carboxyfluorans, esterified dialkylamino-substituted 2-anilino-5'/6'-carboxyfluorans, 2-amino and substituted amino-5'/6'-carboxyfluorans, 1,3-dialkyl-5'/6'-carboxyfluorans and 3,3-(corresponding-substituted-diaryl)-5/6-carboxyphthalides useful as color formers, particularly in carbonless duplicating and thermal marking systems, are prepared by the interaction of 4/5-carboxy-2-(4-dialkylamino-substituted-2-hydroxybenzoyl)benzoic acids and substituted diphenylamines to produce the phthalides which are then subjected to ring closure to produce the carboxyfluorans and by the interaction of 4/5-carboxy-2-(4-dialkylamino-substituted-2-hydroxybenzoyl)benzoic acids and substituted 4-hydroxyacetanilides or alkyl phenols which are esterified with alkyl halides or dialkyl sulfates.

REFERENCES:
patent: 3624107 (1971-11-01), Lin
patent: 3839361 (1974-10-01), Terayama et al.
patent: 3920510 (1975-11-01), Hatano et al.
patent: 3989716 (1976-11-01), Spatz
patent: 4104437 (1978-08-01), Vincent et al.

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