Chromogenic phthalides

Details Chromogenic phthalides Chromogenic phthalides

1989-08-16

1991-08-13

Raymond, Richard L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D40704

Patent

active

050398229

ABSTRACT:
Chromogenic phthalides of formula ##STR1## wherein X, R.sub.1 and R.sub.2 are each independently of the other C.sub.3 -C.sub.6 alkyl,

REFERENCES:
patent: 4062866 (1977-12-01), Garner et al.
patent: 4186134 (1980-01-01), Garver et al.

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