| 摘要 |
<p>Provided is a novel photochromic compound with favorable durability wherein the color during coloring is an intermediate color (exhibits double peak properties), color intensity is high, and color fading is rapid. For example, a chromene compound in which a group having a sulfur atom where the sulfur atom bonds to a seventh position carbon atom (a methylthio group in formula (20)) is introduced to the seventh position carbon atom, as in the compound expressed by formula (20), the compound having high color intensity, a rapid color fading rate, and favorable durability.</p> |
