The effect of replacing a benzene ring with a saturated six-membered ring on the mesomorphic properties of 4,4′-disubstituted diphenyldiacetylenes

A limited selection of ring modified diphenyldiacetylenes of the type where A = ,Y = CnH2n+1, CF3, F, COMe, NH2, and NMe2, and A = - [GRAPHICS] , trans and cis with Y=F and trans with Y=C3H7, were synthesized. Mesomorphic properties were determined by hot stage polarizing microscopy and DSC. These properties were generally poorer than those found in the parent benzene compounds. This was also true of some pyrimidine analogues reported earlier. Birefringence values also decreased as expected.