ap-8-Chloro-1,4-dimethyl-9-(2-methylbenzyl)triptycene and sc*(9S*)-8-Chloro-1,4-dimethyl-9-(2-methylbenzyl)triptycene

Two atropisomers, ap and sc*(9S*), of the title compound [8-chloro-1,4-dimethyl-9-(2-methylbenzyl)-9,10-dihydro-9,10-o-benzenoanthracene, C₃₀H₂₅Cl] have been isolated and their structures determined by X-ray diffraction. The structures of the two isomers are essentially the same as those of the analogous bromo derivatives. The crystal of the sc*(9S*) isomer decomposed when it was heated to 493 K, owing to the sc-ap transition.

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