Alkyl Shifts, and Hydrogen shifts in SN1

[chaser0]

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I was wondering if
1.) By convention, one occurs before the other

2.) If the shift is done in one-single concerted reaction with the departure of the LG, or in two.

 

[hellocubed]

In the first step of the SN1 reaction, if the release of a LG results in a primary carbocation and there is an alkyl group next to it, the LG release and the alkyl shift is ONE CONCERTED REACTION as a primary carbocation is extremely unstable.


I don't know anything about H-shift preferably occurring before the alkyl shift, or vice versa. If anyone has information on this it would be very helpful.

 

[MedPR]

I believe the alkyl shift is preferable since it creates a more substituted product than a hydride shift.