Synthesis and mesomorphic properties of deuteriated 4,4′-di-n-aIkyloxyazoxybenzenes-d2(2n+1)

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Abstract
Symmetrically deuteriated liquid crystals, 4,4′-di-n-aIkyloxyazoxybenzenes-d(2n+1) 2 with n = 2, 3, 4, 5, 6, i.e. 2OAOB-d10 3OAOB-d14, 4OAOB-d18 5OAOB-d22 and 6OAOB-d26 were synthesized by oxidation of the corresponding deuteriated alkyloxyanilines. The catalytic deuterium exchange on levulinic acid was used as the first step in the synthesis of the perdeuteriated alkyl bromides. The mesomorphic properties of the deuteriated 4,4′-di-n-alkyloxyazoxybenzenes were determined by DSC. Phase transition temperatures as well as their enthalpy and entropy values were lower than the respective values for the undeuteriated analogues.