| abstract |
Described here are compounds generally comprising an indeno[2',3':3,4]naphtho[1,2-b]pyran structure. Such compounds can be exploited for their photochromic properties and are used in certain photochromic compositions. Such compositions may further comprise other photochromic compositions and/or materials. Additionally, such compounds and/or compositions may be suitable for the preparation of certain photochromic articles. Also described herein are methods of making certain photochromic compounds, compositions and articles. |