Pinacol Rearrangement of asymmetrical diol

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Homework Statement

write down the mechanism of pinacol arrangement of the following diols

Relevant Equations

none

I have a question for the first part a), pinacol rearrangement of 1,1-diphenylethane-1,2-diol (did I name that right..?).
How would you know if protonation takes place on the hydroxyl molecule attached to carbon 1 or carbon 2?
My guess is that the hydroxyl group at carbon 1 would be protonated, since leaving of the hydroxyl group (as water) will yield tertiary carbocation, which is stable.
Is this approach correct?

Thank you for your help!

 

[docnet]

Homework Statement:: write down the mechanism of pinacol arrangement of the following diols
Relevant Equations:: none

I have a question for the first part a), pinacol rearrangement of 1,1-diphenylethane-1,2-diol (did I name that right..?).
How would you know if protonation takes place on the hydroxyl molecule attached to carbon 1 or carbon 2?
My guess is that the hydroxyl group at carbon 1 would be protonated, since leaving of the hydroxyl group (as water) will yield tertiary carbocation, which is stable.
Is this approach correct?
View attachment 287170


Thank you for your help!

If the hydroxyl group at carbon 1 was protonated, then which group would undergo rearrangement for the piñacolada to become piñacologne? I believe it needs to be the hydroxyl group on carbon 2.