New preorganized calix[4]arenes. Part I. A doubly-crowned calix and a double-calixcrown derived from 4,6,10,12,16,18,22,24,25,26,27,28-Dodecamethyl-5,11,17,23-tetrahydroxycalix[4] arene |
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| Authors: | Zouhair Asfari Sebastiano Pappalardo J. Vicens |
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| Affiliation: | (1) URA 405 du C.N.R.S., E.H.I.C.S., 1, rue Blaise Pascal, F-67008 Strasbourg, France;(2) Dipartimento di Scienze Chimiche, Università di Catania, 8, Viale A. Doria, I-95125 Catania, Italy |
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| Abstract: | A doubly-crowned calix and a double-calixcrown derived from 4,6,10,12,16,18,22,24,25,26,27, 28-dodecamethyl-5,11,17, 23-tetrahydroxycalix[4]arene (1) have been prepared by reaction of appropriate oligoethylene glycol ditosylates with (1) in acetonitrile in the presence of potassium carbonate. A potassium template effect is observed during one of the double cyclizations. |
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| Keywords: | Preorganized calix[4]arenes mesitol-derived calix[4]arene |
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