Complexation of alkali metal cations by conformationally rigid, stereoisomeric calix[4]arene crown ethers: A quantitative evaluation of preorganization
Selective bridging of p-tert-butylcalix[4]arene (1) with tetra-and pentaethylene glycol ditosylate gives the 1,3-dihydroxy-p-tert-butylcalix[4]arene crown ethers 7 and 9 in good yields. The subsequent alkylation of the two phenolic groups of 7 and 9 with
Ghidini, Eleonora,Ugozzoli, Franco,Ungaro, Rocco,Harkema, Sybolt,Abu El-Fadl,Reinhoudt, David N.
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