The feature of liquid crystalline phases of p-alkoxybenzoyloxycholesterins was elucidated. In addition to blue, cholesteric and smectic A phases also monotropic, ferroelectric smectic C phases were detected. p-Alkoxybenzoic anhydrides obtained as side products in esterification reactions show highly ordered smectic phases which resemble those of the isosteric propanediones.
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Vill et al. (1990) studied this question.