| 摘要 |
The invention pertains to a phenylethanediol derivative having at least one polymerizable group, characterized in that the phenylethanediol derivative further comprises at least one photo-convertible group for adjusting the helical twisting power of the phenylethanediol derivative. According to a preferred embodiment the phenylethanediol has the formula wherein A stands for a bond or a p-phenylene group; B and B' are independently (O)<SUB>p</SUB>-C<SUB>o</SUB>H<SUB>2o</SUB>-O-CO-CR'-CH<SUB>2</SUB>, o being 2-12, p being 0 or 1, and R' being H or CH<SUB>3</SUB>; P stands for a CH<SUB>2 </SUB>or a C-O group; Q and Q' are independently selected from H, C1-C3 alkyl, C1-C3 alkoxy, halogen, and CN; n is an integer from 1 to 3; and m is an integer from 0 to 2; and: wherein A stands for a bond or a p-phenylene group; B is (O)<SUB>p</SUB>-C<SUB>o</SUB>H<SUB>2o</SUB>-O-CO-CR'-CH<SUB>2</SUB>, o being 2-12, p is 1, and R' being H or CH<SUB>3</SUB>; P stands for a CH<SUB>2 </SUB>or a C-O group; Q is selected from H, C1-C3 alkyl, C1-C3 alkoxy, halogen, and CN; and m is an integer from 0 to 2. |
