Chromogenic methylenepyrrolines

Details Chromogenic methylenepyrrolines Chromogenic methylenepyrrolines

1993-04-23

1995-02-07

Raymond, Richard L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

5483647, 548440, 548466, 548471, C07D20944

Patent

active

053876946

ABSTRACT:
The present invention relates to chromogenic methylenepyrrolines and processes and intermediates for their preparation and to their use.
The chromogenic methylenepyrroline compounds according to the invention have the formula (I) defined in claim 1.
These colour formers are suitable in particular for thermographic recording processes and produce intensive red, violet, blue or brown colourations. They are distinguished by the fact that they do not require any conventional electron-withdrawing acid colour developer.

REFERENCES:
patent: 4356123 (1982-10-01), Lotsch
patent: 4373102 (1983-02-01), Neumann et al.
patent: 4385174 (1983-05-01), Iqbal et al.
patent: 4481272 (1984-11-01), Eckell et al.
patent: 4496727 (1985-01-01), Iqbal et al.
Patent Abst's. of Japan vol. 001, No. 317 (1987) of JP-A-62106076.
Derwent Abst. 89-009254/02 of EP 298,037 (1989).
Derwent Abst. 87-015773/03 of EP 209,028 (1987).

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