Browsing by Subject "Organocatalysis ORGANOCATALYSIS"
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- PublicationOpen AccessMechanical bonding activation in rotaxane-based organocatalysts(Royal Society of Chemistry, 2021) Pérez Martínez, Jesús de Maria; Puigcerver, Julio; Orlando, Tainara; Martins, Marcos A. P.; Alajarín, Mateo; Martinez-Cuezva, Alberto; Berná Cánovas, José; Pastor, Aurelia; Química OrgánicaWe report here the enhanced efficiency as organocatalysts of a series of succinamide-based hydrogen-bonded [2]rotaxanes functionalized with an acyclic secondary amine as the catalytic active site. We also evaluated their catalytic activity, comparing with that of their non-interlocked threads, in an iminium-type process between crotonaldehyde and acetylacetone. The presence of an interlocked polyamide macrocycle notably increased the catalytic activity of the entwined organocatalysts. The mechanized catalysts rapidly form the reactive iminium intermediate with the aldehyde, increasing its population. The hydrogen-bonding interaction established between the macrocycle and the electrophile has been proposed as one of the reasons for the rapid formation and stabilization of this key intermediate.