| 摘要 |
Compounds of formulae I and II <IMAGE> (I) <IMAGE> (II) wherein D is H or -OR wherein R is phenyl and R1 to R4 are H or a substituent such as phenylthio, and one of the substituents R1, R2, R3 and R4 is a group of formula III -E-CR5=C(R6)2(III) or R is substituted by a group of formula III, wherein E is a direct bond or -X-C(O)- wherein X is a linking group, and R5 and R6 are each independently of the other H, halogen, C1-C12alkyl or C6-C10aryl, can be polymerised to homopolymers or copolymers. The monomers and polymers are reversible photochromic systems which can be used as color indicators, as photochemically modifiable color filters, or for the optical storage of information.
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