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The first example of a new class of diol mesogens is described. Cis, cis-(3,5-dihydroxycyclohexyl)-3,4,5-tris(decyloxy)benzoate was synthesized starting from cis, cis-phloroglucitol, which had been protected by phenylboronic acid. Polarizing microscopy and calorimetric measurements provide evidence for a broad mesophase range, including room temperature. The existence of a hexagonal columnar structure is probable. Furthermore several derivatives are described.

The synthesis and thermal behaviour of a cis,cis-(3,5-dihydroxycyclohexyl) 3,4,Stris(alkoxy)benzoate, functionalized by one terminal C-C double bond is described. Its mesophase of the hexagonal columnar type is formed by a "supramolecular" unit, consisting of six single molecules aggregated via hydrogen bonding. Subsequently, a liquid-crystalline side-chain polymer with a siloxane backbone was synthesized. Its mesophase behaviour, investigated by means of differential scanning calorimetry (DSC) measurements and polarizing microscopy, is discussed. 0 1991, Hiithig & Wepf Verlag, Basel CCC 0025-1 16)3/91/$05.00

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