Chromogenic lactone compounds of benzopyrano-2H-pyrazoles

Details Chromogenic lactone compounds of benzopyrano-2H-pyrazoles Chromogenic lactone compounds of benzopyrano-2H-pyrazoles

1989-04-25

1990-06-12

Lee, Mary C.

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

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

546 15, 548370, C07D49102, C09B 5700

Patent

active

049334484

ABSTRACT:
Chromogenic lactone compounds of benzopyrano-2H-pyrazoles of the formula ##STR1## in which Ar is an aryl radical which is unsubstituted or substituted by halogen, nitro, cyano, lower alkyl, lower alkoxy, lower alkylthio, lower alkoxycarbonyl, trifluoromethyl, phenoxy, phenylthio or --NX.sub.3 X.sub.4,

REFERENCES:
patent: 3837889 (1974-09-01), Hughes et al.
patent: 3974175 (1976-08-01), Garner et al.
patent: 4007195 (1977-02-01), Garner et al.
patent: 4011237 (1977-03-01), Petitpierre et al.
patent: 4039557 (1977-08-01), Garner et al.
patent: 4410708 (1983-10-01), Yahagi et al.

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