Mesomorphic oxadiazoles with terminal Cl-substituent

New liquid crystalline oxadiazoles containing terminal Cl-group and phenylc yclohexane fragment together with their biphenyl analogues have been synthe sized and investigated by DSC and polarizing microscopy. There is a direct dependence of results obtained on the central heterocyclic structure and th e character and position of the substituent related to the asymmetrical het erocyclic unit.