Tetrahedron p. 6019 - 6024 (1993)
Update date:2022-07-29
Topics:
Kraft, Dagmar
Arnecke, Ralf
Boehmer, Volker
Vogt, Walter
Alkylation of p-tert-butylcalix<5>arenes with oligoethylene glycol-ditosylates in the presence of CsF affords the 1,3-bridged calix<5>crowns 1a-c in 51 to 72percent yield.In the case of hexaethylene glycol the isomeric 1,2-bridged calix<5>crown-7 2c was obtained additionally.The calixcrowns were further modified by alkylation of the remaining hydroxyl groups.
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