| abstract |
Materials of formula (I) are new: R1, R2, R3 = H, halogen, OH, -NO2, -CN or opt. substd. monovalent organic gp.; R4 = H, halogen, -NO2, -CN or opt. substd. monovalent organic gp.; and R5 = halogen, OH, -NO2, -CN or opt. substd. monovalent organic gp.. Also claimed are: (i) the prepn. of (I) by alkylation of opt. substd. indan-1-ones with alkyl halides, then reacting with opt. substd. benzyl magnesium halide Grignard reagent and then acidifying, (ii) polymers contg. at least one stilbene gp. of formula (I) in which the monovalent substituent for R1-R5 is replaced by a divalent gp., and (iii) optical elements contg. (I) or at least one of the aforementioned polymers. |