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. 2018 Dec 21;6:623. doi: 10.3389/fchem.2018.00623

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Copyright © 2018 Mouarrawis, Plessius, van der Vlugt and Reek.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) Calixarene backbone. (B) Intramolecular transesterification of UpU (16) by a copper calixarene catalyst. (C,a) Wacker oxidation and (b) the applied calix[n]arene.