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Some di(4-alkyloxyphenyl ester)s of aromatic dicarboxylic acids which presumably exert significant steric hindrance to molecular packing, such as di(2- and/or 3-methyl or -chloro-4-alkyloxyphenyl) 2,5-pyridinedicarboxylates, di(2- and/or 3-methyl-4-alkyloxyphenyl) 2,6-naphthalenedicarboxylates, and di(4-alkylxyphenyl) 3,5-pyrazoledicarboxylates, are shown to indicate nematic liquid-crystalline behaviour.
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