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Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization
Published on: November 29, 2018
A Short Covalent Synthesis of an All-Carbon-Ring [2]Rotaxane
Luuk Steemers1, Martin J Wanner1, Andreas W Ehlers1,2
1Van't Hoff Institute for Molecular Chemistry, University of Amsterdam , Science Park 904, 1098 XH Amsterdam, The Netherlands.
Abstract:
While the current supramolecular syntheses of [2]rotaxanes are generally efficient, the final product always retains the functional groups required for non-covalent preorganization. A short and high-yielding covalent-template-assisted approach is reported for the synthesis of a [2]rotaxane. A terephthalic acid template core preorganizes the covalently connected ring precursor fragments to induce a clipping-type cyclization over the thread moiety. Cleavage of the temporary ester bonds that connect the ring and thread fragments liberates the [2]rotaxane.
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