A chlorophobic pocket in the p-tert-butylcalix[4]arene cavity: a test site for molecular recognition investigated by 13C CP MAS NMR and X-ray crystallography†

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Eric B. Brouwer, Konstantin A. Udachin, Gary D. Enright, Christopher I. Ratcliffe, John A. Ripmeester, Eric B. Brouwer, Gary D. Enright and John A. Ripmeester


Abstract

Five-membered aliphatic guests X(CH2)3Y (X, Y = Me, OH, Cl, Br) adopt equilibrium positions in the asymmetric p-tert-butylcalix[4]arene cavity formed in the solid state and reveal a marked aversion of the host pocket for halogen end-groups.


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