The chiral structure of heptalene is characterised, for a given configuration, by helicities, which are opposite in the direction (x) of the central C(5a)‐C(10a) bond and in the direction (y) of a line perpendicular to it, passing through the C(3)‐and C(8)‐atoms. These two helicities can be experimentally established and differentiated by the handedness of the cholesteric mesophases induced in a biphenyl‐type liquid crystal (LC) by chiral heptalenes with substituents favouring the x or y orientation along the nematic director of the LC.
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Gottarelli et al. (1987) studied this question.
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