| 摘要 |
Decalins of the formula <IMAGE> I wherein ring A is aromatic or a trans-1,4-disubstituted cyclohexane ring; R2 is methyl, -CH2R', -OR', -CO-R', -CN, -COOH, -CO-OR', -CO-SR' or -O-CO-R'; R1 is hydrogen, methyl, -CH2R, -OR or -CH2OR, or when R2 is methyl, -CH2R', -OR' or -CO-R', R1 also can be -CN, -COOH, -CO-OR, -CO-SR or -O-CO-R; R and R' each are alkyl; and R1 and R2 each have up to 12 carbon atoms and together have at most 14 carbon atoms, their racemates and optically active antipodes, are described. Liquid crystalline mixtures comprising Compound I as well as their use in electro-optical devices also are disclosed.
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