| 摘要 |
Compounds of the formula (I)R1-(A1)a(-M1)b-(-A2)c(-M2)d(-A3)e(-M3)f(-A4)g-H(I)in which the symbols and indices have the following meanings: R1 is B or a straight-chain or branched alkyl radical having 1 to 22 carbon atoms (with or without an asymmetrical carbon atom) in which, in addition, it is possible for one or two non-adjacent -CH2- groups to be replaced by -O-, -S-, -CO-, -CO-O-, -O-CO-, -CO-S-, -S-CO-, -O-CO-O-, -CH=CH-, -C 3BOND C-, DELTA or -Si(CH3)2-, and in which, in addition, one or more hydrogen atoms of the alkyl radical may be substituted by F, Cl, Br or CN, or is a chiral group, for example an epoxide, a dioxolane or a cyclic lactone, -(A1)a(-M1)b-(-A2)c(-M2)d(-A3)e(-M3)f(-A4)g- is a system comprising 1 to 4 rings (cyclohexane, aromatic or heterocyclic), it being possible for the system to be linked in different ways. The compounds according to the invention increase the response speed of liquid-crystal mixtures.
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