| 摘要 |
<p>Provided is a novel, durable photochromic compound that exhibits a medium color tone when in a colored state, low initial coloration, high color density, and a high fading speed. Said photochromic compound is a chromene compound, the basic skeleton of which is an indeno(2,1-f)naphtho(1,2-b)pyran structure represented by structural formula (1). One of the carbon atoms between the fifth carbon atom and the twelfth carbon in the pyran structure, inclusive, is connected via a carbon-carbon bond to a substituent which is a condensed polycyclic group wherein an alicyclic ring, aliphatic heterocyclic ring, aromatic ring, or aromatic heterocyclic ring is condensed with an alicyclic ring or aliphatic heterocyclic ring which has a binding site for the carbon atom in the pyran structure.</p> |
