- Chiral reaction products produced from mesogenic molecular structural elements and bifunctionally reactive tartaric acid derivatives, and their use as dopants in liquid crystal phases
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The new compounds produced from a molecular structural element with two chirality centers and at least one mesogenic structural element are defined by the general formula (I) STR1 in which the symbols have the following meaning: Y1 =H, (C1 -C10)alkyl, MC--CH2 or MC--CO, MC denoting the molecular radical of a mesogenic carboxylic acid after splitting off a COOH group, Y2 =(C1 -C10)alkyl, MC--CH2 or MC--CO, it being possible for Y1 and Y2 to jointly represent a MC--CH group, which is then part of a dioxolane ring, X=COOR1, CONH2, CONR2 R3 or C N, R1 =(C1 -C10)alkyl or MC--CH2, and R2, R3 =H and (C1 -C4)alkyl or, independently of each other, (C1 -C4)alkyl. Said esters preferably find application as dopants in twistable liquid crystal phases in which they produce temperature compensation and twisting.
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