![]() ![]() ![]() Thus, in some sense, this might be an inverse ratchet where the asymmetry dictating the sense of rotation would reside in the pawl rather than in the “teeth” on the “wheel” (the triptycene unit) as it does in a normal mechanical ratchet. The reason for thinking this might occur was that the benzophenanthrene moiety-the “pawl” of the ratchet-was anticipated to be helical. It was designed to be a “molecular ratchet,” so named because it appeared that it should undergo internal rotation about the A-B bond more readily in one direction than the other. They had synthesized the molecule shown in figure 12.1. ![]() In 1997, Ross Kelly and his coworkers at Boston College reported their results from an experiment with an intriguing premise (Kelly et al., 1997 see also Kelly et al., 1998). ![]()
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