Abstract:Spectrophotometric titrations of calix[4]arene and p-tert-butylcalix[6]arene with LiOH, NaOH, KOH, tetramethylmmonium and tetrabutylammonium hydroxides as bases were carried in ethanol 95 % and acetonitrile. The dependence of pK a of the first deprotonation of calix[4]-arene with the nature of the cation was only modest in ethanol 95 %, spanning from 8.53 pK a unit for NaOH until 9.00 for LiOH, whereas in acetonitrile the proton transfer is quantitative. The first deprotonation of p-t-butylcalix[6]arene in bot… Show more
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