Chromene compound

Details Chromene compound Chromene compound

1998-04-30

1999-08-03

Richter, Johann

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

Organic compounds

Chalcogen in the nitrogen containing substituent

544 62, 544375, 544376, 546112, 546164, 546269, 548454, 548511, 549389, C07D22104, C07D31192, C07D40502, C07D41302

Patent

active

059327251

ABSTRACT:
The present invention relates to a novel chromene compound having favorable photochromic properties, developing a color of a high density, exhibiting a small degree of initial color and permitting the color to quickly fade. The novel chromene compound has an amino group that may be substituted for a sixth position of a naphthopiran ring, has electron-donating groups at para-positions of the two phenyl groups bonded to the third position, and has at least one or more electron-attracting groups at meta-positions of the phenyl groups, and is represented, for example, by the following formula, ##STR1##

REFERENCES:
patent: 3567605 (1971-03-01), Becker

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