Chromene compound
AssigneeTokuyama Corporation
InventorsJunji Momoda, Yuichiro Kawabata, Nobuyuki Tanaka, Arihiro Iwata
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Abstract
A chromene compound of this invention, as shown in the following formula: characterized by having an indeno(2,1-f)naphtho(1,2-b)pyran structure as a basic structure, and having a substituent which is a substituted or unsubstituted aryl group such as methoxyphenyl group, or a substituted or unsubsterituted heteroaryl group such as thienyl group bonding to a carbon atom at the seventh position of the indeno(2,1-f)naphtho(1,2-b)pyran structure. The photochromic compound exhibits a color tone of a neutral tint when it develops a color, features a high color-developing sensitivity and a high fading rate, and has a good photochromic resistance.
Claims5
A chromene compound having an indeno(2,1-f)naphtho(1,2-b)pyran structure represented by the following formula:
- as a basic skeleton, wherein a substituted or unsubstituted aryl group or a substituted or unsubstituted heteroaryl group is bonded, as a substituent, to a carbon atom at the seventh position of the pyran structure;
- an aliphatic monocyclic ring, which may have a lower alkyl group having not more than 4 carbon atoms as a substituent, is spiro-bonded to a carbon atom at the thirteenth position of the pyran structure;
- and
- an alkoxy group or a p-alkylaminophenyl group having a Hamett number in a range of −0.49 to −0.2 is bonded to a carbon atom at the sixth position of the pyran structure.
Dependencies are inferred from the claim text.