Transition temperatures and transition energies of the p-n-alkoxy benzoic acids, from n-propyl to n-octadecyl

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The alkoxy benzoic acids, above n-propyl, exhibit liquid crystal properties. The homologous series of acids from n-propyl to n-octadecyl has been synthesized, the transition temperatures of each member of the series measured by means of a heated-stage, polarizing microscope, and the corresponding transition energies determined by differential scanning calorimetry. Some of the acids showed solid state transitions not previously reported.