A chromene compound having a short fading half period, especially, a short fading half period even at a low temperature in a general-purpose polymer solid matrix.
The chromene compound is represented by the following formula (1).
wherein R1 is a hydroxyl group or the like, R2 and R3 are each an aryl group or the like, C* is a spiro carbon atom,
a spiro ring A represented by the following formula is a saturated hydrocarbon ring having 4 to 12 ring member carbon atoms or the like, and at least one ring member carbon atom constituting the ring A is a group represented by the following formula (4), and
X is a divalent group such as arylene group,
wherein R7 and R8 are each a cycloalkyl group or the like.
一种在通用聚合物固体基质中具有较短褪色半衰期,特别是在低温下也具有较短褪色半衰期的
铬烯化合物。
铬烯化合物由下式(1)表示。
其中 R1 是羟基或类似基团,R2 和 R3 分别是芳基或类似基团,C* 是螺碳原子、
由下式表示的螺环 A 是具有 4 至 12 个环状碳原子或类似物的饱和烃环,且构成环 A 的至少一个环状碳原子是由下式(4)表示的基团,以及
X 是二价基团,如芳基、
其中 R7 和 R8 各为环烷基或类似基团。