Chromene compound

Details Chromene compound Chromene compound

2005-04-05

2005-04-05

Solola, Taofiq (Department: 1626)

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C430S270150

Reexamination Certificate

active

06875878

ABSTRACT:
A chromene compound represented by the general formula (1),wherein R1to R4are hydrogen atoms, hydroxyl groups, alkyl groups, alkoxy groups, substituted amino groups or halogen atoms, R1to R4may be bonded together to form a ring, R5and R6are alkyl groups, aryl groups or heteroaryl groups, or R5and R6together may form a ring, a cyclic group containing X or Y is an aromatic hydrocarbon group or an aromatic heterocyclic group, and a divalent group Z is an alkylene group.This compound exhibits excellent photochromic properties, such as small initial color, a large fading rate, excellent resistance and developing a color tone of a neutral tint.

REFERENCES:
patent: 4578469 (1986-03-01), Deger et al.
patent: 0015628 (2000-05-01), None
patent: 0077007 (2000-12-01), None
patent: 02090342 (2002-11-01), None

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