Preparation of chromogenic azaphthalides

Details Preparation of chromogenic azaphthalides Preparation of chromogenic azaphthalides

1983-06-07

1985-04-02

Jiles, Henry R.

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

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

546116, 546273, 346220, C07D491048

Patent

active

045088977

ABSTRACT:
Chromogenic azaphthalides of the formula ##STR1## wherein R.sub.1 and R.sub.2 independently of each other are hydrogen, C.sub.1 -C.sub.12 alkyl which is unsubstituted or substituted by halogen, hydroxyl, cyano or lower alkoxy, or are cycloalkyl, benzyl or phenyl, or benzyl or phenyl which are substituted by halogen, nitro, cyano, lower alkyl, lower alkoxy or lower alkoxycarbonyl; or R.sub.1 and R.sub.2 together with the nitrogen atom to which they are attached are a 5-membered or 6-membered heterocyclic radical and in particular pyrrolidinyl;

REFERENCES:
patent: 3775424 (1973-11-01), Farber
patent: 3916070 (1975-10-01), Ozutsumi et al.
patent: 3936564 (1976-02-01), Miyazawa et al.
patent: 4046776 (1977-09-01), Garner et al.
patent: 4102893 (1978-07-01), Garner et al.
patent: 4334072 (1982-06-01), Becker et al.

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