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A rotaxane (from Latin rota ' wheel ', and axis ' axle ') is a mechanically interlocked molecular architecture consisting of a dumbbell -shaped molecule which is threaded through a macrocycle (see graphical representation). The two components of a rotaxane are kinetically trapped since the ends of the dumbbell (often called stoppers) are larger ...
Oct 20, 2017 · The researchers have also demonstrated that a switchable rotaxane may asymmetrically catalyze reactions in a controlled fashion (Figure 24). 52 Rotaxane (R)-46 + PF 6 − includes two stations: in acidic conditions, the central secondary amine of the axle is protonated and the crown ether macrocycle resides over the resulting ammonium group ...
- Nicholas Henley Evans
- 85
- 2018
- 20 October 2017
Aug 22, 2020 · Similarly to the capping method, snapping involves the pre-assembly of semi[2]rotaxane and covalent bonding with a stopper (Fig. 1 (ii)). As the macrocycle component is pre-synthesized in both methods, capping and snapping are especially suitable for the synthesis of [2]rotaxanes based on cyclodextrins, cucurbit[n]urils, and other macrocycles whose syntheses and modifications are not ...
Apr 2, 2020 · Front Cover: Mechanochemical Solvent-Free Conditions for the Synthesis of Pillar [5]arene-Containing [2]Rotaxanes (Eur. J. Org. Chem. 21/2019) The Front Cover shows an artistic view of an inclusion complex resulting from the association of dodecanedioyl dichloride and a pillar [5]arene derivative. The latter has been used to prepare a series of ...
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Jan 12, 2021 · The supramolecular structure called “rotaxane” is obtained by penetrating the cavity of a cyclic molecule with a linear molecule whose ends are capped by a molecule that is larger than the ...
- Yuichiro Kobayashi
- kobayashiy11@chem.sci.osaka-u.ac.jp
- 2021
Jul 23, 2020 · Generating a rotaxane by threading a non-symmetrical axle through a directional macrocycle provides a mechanically chiral interlocked molecule. 16 In a recent report, Goldup and co-workers described the use of such a mechanically planar chiral rotaxane in enantioselective catalysis for the first time. 43 Similarly to their previous work, the ...
Apr 7, 2022 · Rotaxanes are an emerging class of molecules composed of two building blocks: macrocycles and threads. Rotaxanes, and their pseudorotaxane and polyrotaxane relatives, serve as prototypes for molecular-level switches and machines and as components in materials like elastic polymers and 3D printing inks. The rigidity and flexibility of these molecules is a characteristic feature of their design ...
