M. A. Mikhaleva
Aug 1, 2003
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Journal
Chemistry of Heterocyclic Compounds
Abstract
Abstract(p-R-phenyl)-4-methyl-, 4-methoxy-, and 4-hydroxy-5-pyrimidinecarboxylates have been synthesized and their liquid crystal properties examined. Compounds containing methyl and methoxy groups in the lateral position of the molecule are nematic liquid crystals with a mesophase range of 30-50°C, but the 4-hydroxy derivatives are smectic liquid crystals. With variants of the substituents in a series of (p-R-phenyl)-4-substituted 5-pyrimidinecarboxylates the mp of individual representatives were successfully reduced by ∼50°C in comparison with the 4-unsubstituted analogs and the range of the mesomorphic state was extended to 190°C.