| abstract |
Decalins of the formula ##STR1## wherein ring A is aromatic or a trans-1,4-disubstituted cyclohexane ring; R 2 is methyl, --CH 2 R', --OR', --CO--R', --CN, --COOH, --CO--OR', --CO--SR' or --O--CO--R'; R 1 is hydrogen, methyl, --CH 2 R, --OR or --CH 2 OR, or when R 2 is methyl, --CH 2 R', --OR' or --CO--R', R 1 also can be --CN, --COOH, --CO--OR, --CO--SR or --O--CO--R; R and R' each are alkyl; and R 1 and R 2 each have up to 12 carbon atoms and together have at most 14 carbon atoms, n 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. |