- Full text PDF available (3)
- This year (0)
- Last 5 years (4)
- Last 10 years (11)
Journals and Conferences
Photoswitching of the transformation between seconds and hours time-scales is demonstrated using the threading of per-hydroxylated pillararene onto the azobenzene-end of a viologen derivative. When the azobenzene moiety was in the trans form, the threading of per-hydroxylated pillararene quickly took place at 25 °C and could not be monitored directly.… (More)
We report a new route for the selective synthesis of di- and tetrafunctionalized pillararenes via oxidation and reduction of the pillararene units. Hypervalent-iodine oxidation of perethylated pillararene afforded pillararene derivatives containing one benzoquinone unit and two benzoquinones at the A,B- and A,C-units. A pillararene derivative… (More)
We synthesize nonionic polymer-based polyrotaxanes in solvent systems based on pillararene cyclic host liquids. Using a reactive liquid, pillararene enabled synthesis of a nonionic topological gel.
Planar chiral - and rotaxanes constructed from pillararenes as wheels and pyridinium derivatives as axles were obtained in high yield using click reactions. The process of rotaxane formation was diastereoselective; the obtained rotaxane was a racemic mixture consisting of (pS, pS, pS, pS, pS) and (pR, pR, pR, pR, pR) forms of the per-ethylated… (More)
We monitored the progress of formation of dimethoxypillararene by size-exclusion chromatography. Surprisingly, the cyclization reaction completely finished in just 3 min. By improving the reaction conditions and purification process, we successfully obtained dimethoxypillararene in a short time and in high yield (71%) from commercially available… (More)
We developed "cyclic host liquids (CHLs)" as a new type of solvent. The CHLs are a nonvolatile liquid over a wide temperature range, are biocompatible and recyclable, have high thermal stability, and are miscible with many organic solvents. Compared with typical complexation systems, the CHL system is extremely efficient for maintaining host-guest… (More)
We report a photo-reversible switching system between assembly and disassembly of a supramolecular polymer consisting of an azobenzene-bridged pillararene dimer.
A rotaxane constructed from a per-ethylated pillararene as a wheel and a pyridinium derivative as an axle was prepared. The wheel segment of the per-ethylated pillararene moved from one station to another along the axle as a result of thermal stimuli.
A pillararene-based pseudorotaxane was synthesized using a slippage method by only heating an axle with bulky valine derivative ends in a cyclic host liquid (CHL), which is liquid at room temperature. The pseudorotaxane synthesized in a CHL can be converted back to the starting components, i.e., the pillararene wheel and the axle, by heating in… (More)