| 摘要 |
2,5-Disubstituted heterocycles of the formula I <IMAGE> I in which R1 and R2, each independently of one another, are alkyl, alkenyl or oxaalkyl having up to 12 C atoms, L1 and L2, each independently of one another are H or F, Y is -O-, -CO-O-, -O-CO- or a single bond, m is 1 or 2, Z is H, F, OH or alkyl having up to 5 C atoms, and Q is -O-, -O-CO-, or if Z is fluorine or hydroxyl, is also be a single bond are suitable as components of ferroelectric mixtures.
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