https://mtor-signal.com/antica....ncer-action-in-the-p
Suzuki coupling of ferrocenylboronic acid to mono- or dibromoanthracene yielded the ferrocenyl anthracenes on the way to the corresponding triptycenes by which stepwise hindered rotations for the ferrocenyl groups behaved like molecular dials. CuCl2-mediated coupling of methyl- and phenyl-indenes yielded their rac and meso 2,2'-biindenyls; amazingly, however, the apparently sterically crowded rac 2,2'-Bis(9-triptycyl)biindenyl functioned as a freely rotating pair of mol
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