For 10 points, name this set of molecular machines that consumes energy to generate mechanical work.
One of these systems relies on the chiral ring opening of a biaryl lactone, whose mechanism had been described by Branchaud. An early example of one of these systems contained an aminated triptycene group bonded to a [4]helicene with an important 3-hydropropoxy group discovered by Kelly et al. One of these systems uses two nanometer long stalks of polymerized iceane and fullerene "blades" and is powered by electron tunneling. The fastest example of one of these systems to date is synthesized by the Barton-Kellog reaction, which couples ketones to thioketones via a diazo intermediate; that molecule is asymmetric, possessing a tert-butyl group and a fluorene component. Feringa developed objects of this type driven photochemically. Natural examples include kinesins, as well as the F-naught-F-one ATP synthase, the axle of which rotates due to a proton gradient. For 10 points, name this set of molecular machines that consumes energy to generate mechanical work.
One of these systems relies on the chiral ring opening of a biaryl lactone, whose mechanism had been described by Branchaud.
molecular {motors} [accept {motor proteins} after “{natural examples}”]