| abstract |
The present invention relates to compounds represented by the following Formula Ia, n nin which each R 1 -R 6 can in each case be independently selected from hydrogen or hydrocarbyl (e.g., methyl); R 7 is a multivalent linking group, such asn n nL 1 is a divalent linking group, such as a bond or divalent optionally substituted hydrocarbyl; each L 2 independently represents a flexible segment, such as divalent linear or branched C 1 -C 25 alkyl; each L 3 independently represents a rigid segment including, for example, optionally substituted phenylen-1,4-diyl groups; t is from 1 to 4; m and p are each independently from 0 to 4 for each t, provided that the sum of m and p is at least 1 for each t; and E can be hydrogen or optionally substituted hydrocarbyl. The present invention also relates to compositions, such as liquid crystal compositions, and articles, such as optical elements, that include the compound represented by Formula Ia. |