orgo question

[baedero1]

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Please explain the different reaction b/w these two...
I think these two reaction are E2. Why do they have different product?
Does the reaction follow the Zaltsev's rule?

 

[IDontUnderstand]

The reason the top one takes the hydrogen off of the top carbon is because it's such a big base (it's going to go for the least sterically hindered carbon)

The bottom one is a small base so it can eliminate according to Zaitsev's rule

 

[doc3232]

The reason the top one takes the hydrogen off of the top carbon is because it's such a big base (it's going to go for the least sterically hindered carbon)

The bottom one is a small base so it can eliminate according to Zaitsev's rule

Yes, so top 1 (the base) is branched which means it won't be able to get in that close to the secondary carbon.
Remember when the H comes off, the Br won't be there (first step is Br leaves) so the methyl (primary) will be an easy reach. I doubt you need to know that this occurs, but you should understand why it occurs.
GOOD LUCK

 

[baedero1]

yes, but you explain about E1 rxn
however, I think these two rxn are E2..