We have designed, synthesized, and evaluated the physical properties of some high birefringence (Án) isothiocyanato biphenyl-bistolane liquid crystals. These compounds exhibit Án $ 0:7{0:8 at room temperature and wavelength ¼ 633 nm. Laterally substituted short alkyl chains and fluorine atom eliminate smectic phase and lower the melting temperature. The moderate melting temperature and very high clearing temperature make those compounds attractive for eutectic mixture formulation. A eutectic mixture based on those compounds was formulated and its physical properties evaluated. The simulated absorption spectra agree reasonably well with the measured results.

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: 1,3-disubstituted aliphatic and aromatic symmetrical and unsymmetrical thioureas were synthesised by novel routes and the antifungal activities of these compounds against two plant pathogens, Pyricularia oryzae and Drechslera oryzae were studied in Czapek-Dox medium at four di †erent concentrations using acetone as the control and the structure-activity relationship among the substituted thioureas is reported.

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