Tert-butyl cation, hydrated

We can extend the general principles of electrophilic addition to acid catalyzed hydration In the first step of the mechanism shown m Figure 6 9 proton transfer to 2 methylpropene forms tert butyl cation This is followed m step 2 by reaction of the car bocation with a molecule of water acting as a nucleophile The aUcyloxomum ion formed m this step is simply the conjugate acid of tert butyl alcohol Deprotonation of the alkyl oxonium ion m step 3 yields the alcohol and regenerates the acid catalyst... 

With this kind of approach, it was also possible to conclude that, in aqueous medium, aU the cations (monovalent or bivalent), as well as the S04 anion, are electroadsorbed in the pores in hydrated state. On the contrary, it seems that the monovalent anions are basically adsorbed in a non-hydrated state. These results enable to establish a scale of ionic effective dimensions in aqueous medium. These dimensions are compared with the ones of the different molecules used for the calibration of the average pore size of carbons by gas phase adsorption (N2, CF4, SFe and methyl tert-butyl ether (MTBE)) ... 

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