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Shown above is a typical E1 elimination reaction.
The Br- leaves in the first step to generate a secondary carbocation, which rearranges into a tertiary carbocation by shift of alkyl group(s) from adjacent carbon atom. Loss of a hydrogen in the final step gives the alkene products shown above.
A total of 8 products are drawn below.
Me Et Me Et Pri iPr Me Et Me Me 〉 + Pr. iPr + Pri Pr IPr . ' Pe heat iPr . Pe Pe H Pe H H Bu Me Et Me Et Et Bu Pe Bu . Pe Bu+ Bu .
.
Pe Pe H Pr H Pr
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