Synthesis and Mesomorphic Characteristic of Bicyclo-(2,2,2)Octane Derivatives with the -NCS Terminal Group

Compounds containing in their molecule an alkyl substituted bicyclo(2,2,2)octane ring and the phenylisothiocyanato group bonded to it directly or via bridging group such as -COO-, -OCO-, -CH2-CH2- or -CH2O- have been synthesized. The phase transition temperatures, melting enthalpies and viscosities of these compounds have been determined and their suitability as components of nematic mixtures has been tested.