| 摘要 |
6-17851/+ Photochromic compounds, a process for their preparation, and their use Compounds of the formula I (I), in which X is O, S, SO, SO2 or NR13, R13 is, for example, methyl, and R1 to R12, independently of one another, are, for example, H, C1-C12alkyl, C1-C12alkoxy, halogen or -CN. Thecompounds are photosensitive and photochromic and are suitable as photosensitizers and simultaneously as colour indicators, and as photoswitchable colour filters.
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