abstract |
Diketones of the formula ##STR1## wherein R 1 is alkyl, perfluoroalkyl or alkoxy, each of 1-18 carbon atoms; R 2 is alkyl or perfluoroalkyl, each of 1-12 carbon atoms; and X is 1,4-trans-cyclohexylene, 1,4-phenylene or 4,4'-cyclohexylphenyl are liquid crystalline compounds. |