Abstract
AbstractNew terephthalic acids with aromatic substituents were prepared in two different ways. A first attempt was made by nucleophilic substitution of dimethyl nitroterephthalate with phenoxide ions. The formation of phenyl methyl ethers is a significant side reaction in this procedure. The second method consists in the arylation of dimethyl 2‐(4′‐hydroxyphenylthio) terephthalate with activated fluoroaromatics. Insufficient electrophilicity of the fluoro compound is here the limiting factor. Thermotropic polyesters were prepared from 4,4′‐biphenyldiol and various arylthioterephthalic acids. It was found that increasing length of the aromatic side chain improve both solubility and meltability. All polyesters form a nematic phase above their melting point (Tm).
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