NEW LIQUID-CRYSTAL COMPOUND - (+)-4-ALKOXYCARBONYLPHENYL 4-[5-(2-METHYLBUTYL)-1,3-OXATHIAN-2-YL]BENZOATE

New liquid crystal compound: (+)-4-Alkoxycarbonylphenyl-4-[5-(2-methylbutyl)-1,3-oxathiane-2-yl]benzoates (11) was synthesized. The mesomorphic behavior of this compound is compared with those of (+)-4-(2-methylbutoxycarbonyl)phenyl 4-(5-alkyl-1,3-oxathian-2-yl)benzoates (12), and (+)-4-alkoxy-carbonylphenyl 4-[5-(2-methylbutyl)-1,3-dioxan-2-yl]-benzoates (13), and (+)-4-Alkoxyphenyl 4-[5-(2-methylbutyl)-1,3-oxathian-2-yl]benzoates (14). Transition temperatures to the isotropic state for compound 11 were lower than those for the corresponding compounds 12 or 13. Though compound 11 exhibited the cholesteric phase, compound 12 exhibited the smectic phase. These features seem to originate in the wider molecular width of compound 11. Transition temperatures to the isotropic state for compound 11 are lower than those for 14. In this case, the difference of partial molecular width caused by carbonyl group seem to be main factor.