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Stepwise bromination of the triphenylene 1 leads regioselectively to the monobromo and the dibromo compound 2 and 3, respectively (Scheme 1). In contrast to 1 and 2, the dibromo derivative 3 as well as the nitrile 4. obtained from 3 and CuCN, form thermotropic mesophases D h . On irradiation of 3 and 4 a photocurrent can be measured in the crystalline state and an enhanced photocurrent in the LC phase.

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Photoleitende Flüssigkristalle aus der Reihe der 2,3,6,7-Tetrakis(alkoxy)triphenylene / Liquid Crystals in the Series of 2,3,6,7-Tetraalkoxytriphenylenes