Abstract
Four new tri-tert-butylcalix[4]arenes bearing an epoxy or a carbaldehyde function at the upper rim have been prepared by a multi-step synthetic pathway involving initial selective allylation of tris-(O-benzoyl)-tri-tert-butylcalix[4]arene, followed by either m-CPBA oxidation or ozonolysis of the allyl group. The benzoylated epoxycalixarene was obtained as single crystals, analysis of which confirmed the formation of the epoxide group and the partial-cone conformation of the macrocyclic structure.
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