THE SYNTHESIS AND LIQUID-CRYSTAL PROPERTIES OF CERTAIN 1-(4'-N-ALKOXY-2,2',3,3',5,5',6,6'-OCTAFLUOROBIPHENYL-4-YL)-2-(TRANS-4-N-PENTYLCYCLOHEXYL)-ETHANES AND 1-(4'-N-ALKOXY-2,2',3,3',5,5',6,6'-OCTAFLUOROBIPHENYL-4-YL)-2-(TRANS-4-N-PENTYLCYCLOHEXYL)-ETHENES

The synthesis and liquid crystal properties of eight members of the homologous series of 1-(4'-n-alkoxy-2,2',3,3',5,5',6,6'-octafluorobiphenyl-4-yl)-2-(trans-4-n-pentylcyclohexyl)-ethanes and eight members of the corresponding -ethanes, which have the E-configuration, are reported. These compounds are nematic, the ethenes having a considerably mesophase higher thermal stability than the analogous ethanes.