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Several members of the homologous series of 2-[4-n-alkylphenyl]-5-[4-n-alkyloxyphenyl]pyrimidines have been synthesized. The phase transitions were determined by microscopic and calorimetric investigations. The classification of the smectic modifications was done by investigation of the miscibility relations and by texture observations. Besides the nematic phase and smectic phases A and C, smectic phases F, G and H were observed. All the variants of polymorphism observed can be derived from the sequence H G F C A N.
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Biering et al. (1980) studied this question.
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