Five groups of laterally di-substituted three-ring compounds, 4-(3_-fluoro phenylazo)-2-(or 3-) substituted phenyl-4_-alkoxybenzoates, were prepared and investigated for their mesophase formation and stability. Each group of compounds, which have in common a lateral fluorine atom on the first terminal ring, differs from each other by a second lateral group substituted on the central ring.
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