Phthalide derivatives useful as colorless chromogenic material

Details Phthalide derivatives useful as colorless chromogenic material Phthalide derivatives useful as colorless chromogenic material

1986-01-10

1988-03-08

Rotman, Alan L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548523, 546166, 546 94, 427150, C07D29506

Patent

active

047300574

ABSTRACT:
A new phthalide derivative useful as a colorless chromogenic material has the following formula: ##STR1## wherein A and n have the same meaning as defined hereinbefore.

REFERENCES:
patent: 4107428 (1978-08-01), Farber

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