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In the planar form the following molecules have one plane of symmetry.However in the chair-form (the most stable form) for the first molecule and the non-planar form for the second molecule there is no plane of symmetry.Will the molecules still be called meso?

BTW I do not think the molecules ever attain completely planar form.

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Just for quick reference I'm adding the non-planar forms of the two molecules.

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These molecules can never be planar. There are no internal symmetry planes and therefore they are not meso.

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    $\begingroup$ I've just tried building 3D models of the two enantiomers of the 1,2,4,5-tetramethylcyclohexane with my molymod kit and they are not superimposable - I tried chair, boat, half-chair and twist-boat conformations. I haven't tried the cyclooctene but I'm pretty sure it's not meso and it can't be planar, neither in cis nor trans. $\endgroup$
    – Vlad
    Commented Oct 16, 2016 at 3:34

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