| 摘要 |
A compound of formula (I) or a dimer thereof; where R<1 >and R<2 >are independently selected from optionally substituted alkyl, optionally substituted alkenyl, optionally substituted alkynyl, a functional group or a group of sub-formula (i) where m is 0 or 1; p is an integer of from 1 to 12; R<7 >is a group of formula -CqX2q+1 where q is an integer of from 1 to 12 and X is halogen such as fluoro, or <7 >a group of sub-formula (ii) where k is an integer of from 1 to 10, R<8>, R<10>, and R<12 >and each R<9 >and R<11 >are independently selected from alkyl, alkenyl or aryl, such as lower alkyl and in particular methyl; provided that at least one of R<1 >or R<2 >is a group of sub-formula (i); R<3>, R<4>, R<5 >and R<6 >are independently selected from hydrogen or halogen, and in particular fluorine, n is 0 or 1, and A is a ring structure as specified. Compounds of formula (I) may have liquid crystal properties and/or be useful in liquid crystal devices.
|
