1. For a fascinating review on the development of calixarene chemistry see: Calixarenes, The Royal Society of Chemistry, Cambridge, England 1989.
2. Calixarene – Makrocyclen mit (fast) unbegrenzten Möglichkeiten
3. Calixarenes, Macrocycles with(Almost) Unlimited Possibilities
4. Condensation of hydroxymethylated phenols may lead to dibenzyl ether structures (by elimination of water) which can be further converted into methylene bridges (by elimination of formaldehyde). This formally corresponds to electrophilic ipsosubstitution (compare with , , Phenol–Formaldehyde Polymers, in Comphehensive Polymer Science, Vol. 5, Pergamon Press, 1989).