2-Methyl-2-propanol acid-catalyzed dehydration

In the acid catalyzed dehydration of 2 methyl 1 propanol what carbocation would be formed if a hydride shift accompanied cleavage of the carbon-oxygen bond in the alkyloxonium lon" What ion would be formed as a result of a methyl shift" Which pathway do you think will predominate a hydnde shift or a methyl shift" ... 

H NMR spectrum, 817 in mixed Claisen condensation, 836 2-Methyl-2-propanol, 138. See also tert-Butyl alcohol acid-catalyzed dehydration, 182 2-Methylpropene. See also Isobutene Isobutylene... 

Dehydration of alcohols is catalyzed by boron phosphorous oxide. The reactivity of alcohols in the dehydration decreases as follows /ert-amyl alcohol > 3-pentanol > > 2-propanol > 1-pentanol > ethanol.The catalytic activities of the oxides composed of different amounts of B and P for propanol dehydration correlate with the total amount of acid sites.Butanol undergoes dehydration on boron phosphorous oxide. The maximum activity is obtained at the P/B ratio of 0.6. The activity correlates with the sum of Lewis and Bronsted acid sites. 2-Butanol, 2-methyl — 2-butanol, and 3-methyl — 2-butanol also undergo dehydration. The formation of tnw -2-butene and 2-methyl — 2-butene increases with increasing surface acidity. In these reactions, the carbenium ion mechanism is operating. 

---