A Complete Gear System in <i>N</i>‑Benzoyl-Carbazole
Derivatives
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Abstract
2′,6′-Disubstituted <i>N</i>-benzoylated
carbazole derivatives were found to exhibit atropisomerism. The bulky
substituents restricted rotation about the N–C7′ and
C7′–C1′ bonds to separate four atropisomers,
in which rotation about the C7′–C1′ bond was
in perfect concert with rotation about the N–C7′ bond.
Complete geared rotation without slippage at 37 °C for 7 days
was observed for the first time. Conformational analysis clarified
the preference for the gear system over other internal conversion
pathways