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Autor:
Volker Böhmer, Iris Thondorf, Diana de Paoli, Ralph Dörrenbächer, Michael Frings, George Ferguson, Walter Vogt, Mathias Heydenreich
Publikováno v:
The Journal of organic chemistry. 61(2)
Various phenol-derived calix[4]arenes (3) bearing four hydroxy groups in the exo position have been prepared by uncatalyzed condensation of suitable dimers or tetramers with formaldehyde in xylene in yields up to 44%. The tetra-tert-butyl compound (3