results of a selective unstoppering reaction. Interestingly, the initial dissociation also triggered the elimination of the axle segment sepa-rating the stopper from the ammonium binding station. CoGEF calculations have shown that the constriction of the axle by the macrocycle during the elongation of the rotaxane provokes the accumulation of tensile and torsional stress that ultimately leads to the rupture
作者:Vincent Aucagne、David A. Leigh、Julia S. Lock、Andrew R. Thomson
DOI:10.1021/ja057206q
日期:2006.2.1
The synthesis of rotaxanes derived from the syntheticpeptide macrocycles cyclo(l-ProGly)4 and cyclo(l-ProGly)5 and diammonium threads is described. [2]Rotaxanes are formed in good yields (56-63%), despite the disruption of internal amide-amide hydrogenbonding in the macrocycles.
Impact of a Mechanical Bond on the Activation of a Mechanophore
作者:Min Zhang、Guillaume De Bo
DOI:10.1021/jacs.8b08590
日期:2018.10.10
impact of a mechanical bond on the rate of activation of a Diels-Alder mechanophore. Using a combination of experimental and computational techniques, we found that the rate of a retro-Diels-Alder reaction under tension is decreased when the mechanophore is embedded in the axle of a rotaxane due to the presence of a competing high-stress region at the junction between the macrocycle and the axle.