227766-90-7Relevant academic research and scientific papers
The influence of macrocyclic polyether constitution upon ammonium ion/crown ether recognition processes
Cantrill, Stuart J.,Fulton, David A.,Heiss, Aaron M.,Pease, Anthony R.,Stoddart, J. Fraser,White, Andrew J. P.,Williams, David J.
, p. 2274 - 2287 (2000)
Secondary dialkylammonium (R2NH2+) ions are hound readily by dibenzo[24]crown-8 (DB24C8) to form threaded complexes, namely [2]pseudorotaxanes. The effect of replacing one or both of the catechol rings in DB24C8 with resor
A new protocol for rotaxane synthesis
Cantrill, Stuart J.,Fulton, David A.,Fyfe, Matthew C.T.,Stoddart, J. Fraser,White, Andrew J.P.,Williams, David J.
, p. 3669 - 3672 (1999)
A novel [2]rotaxane was synthesized when an aniline-bearing [2]pseudorotaxane-generated by the hydrogen bond-driven threading of a dibenzylammonium filament through the cavity of the macrocyclic polyether dibenzo[24]crown-8-was stoppered via reaction with
Isoselective Lactide Ring Opening Polymerisation using [2]Rotaxane Catalysts
Lim, Jason Y. C.,Yuntawattana, Nattawut,Beer, Paul D.,Williams, Charlotte K.
supporting information, p. 6007 - 6011 (2019/04/03)
Polylactide (PLA) is a fully biodegradable and recyclable plastic, produced from a bio-derived monomer: it is a circular economy plastic. Its properties depend upon its stereochemistry and isotactic PLA shows superior thermal-mechanical performances. Here, a new means to control tacticity by exploiting rotaxane conformational dynamism is described. Dynamic achiral [2]rotaxanes can show high isoselectivity (Pi=0.8, 298 K) without requiring any chiral additives and enchain by a chain end control mechanism. The organocatalytic dynamic stereoselectivity is likely applicable to other small-molecule and polymerization catalyses.
