endo-Cavity complexation and through-the-annulus threading of large calixarenes induced by very loose alkylammonium ion pairs.
A general mode to obtain endo-complexation and through-the-annulus threading of scarcely efficient macrocyclic hosts was obtained by exploiting the inducing effect of the weakly coordinating tetrakis[3,5-bis(trifluoromethyl)phenyl]borate (TFPB) anion that gives free "naked" cations. This method works very well with simple, conformationally mobile calix[6-7]arene ethers, which give conformationally blocked endo-calix or [2]pseudorotaxane complexes.
Gaeta
Carmine
C
Dipartimento di Chimica, Università di Salerno, Via Ponte don Melillo, I-84084 Fisciano, Salerno, Italy. cgaeta@unisa.it
Troisi
Francesco
F
Neri
Placido
P