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How does this brominated intermediate looselose its methyl group?

The problem is such: enter image description here

So far my working has been:

enter image description here

I'm concerned about the last step where the ester forms a ring. The methyl group doesn't look like a plausible leaving group, but it does not appear in the product so how can I get rid of it?

How does this brominated intermediate loose its methyl group?

The problem is such: enter image description here

So far my working has been:

enter image description here

I'm concerned about the last step where the ester forms a ring The methyl group doesn't look like a plausible leaving group but it does not appear in the product so how can I get rid of it?

How does this brominated intermediate lose its methyl group?

The problem is such: enter image description here

So far my working has been:

enter image description here

I'm concerned about the last step where the ester forms a ring. The methyl group doesn't look like a plausible leaving group, but it does not appear in the product so how can I get rid of it?

5 added 1 character in body; added 5 characters in body
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The problem is such: enter image description here

So far my working has been: enter image description here

enter image description here

I'm concerned about the last step where the ester forms a ring … The methyl group doesn't look like a plausible leaving group but it does not appear in the product so how can I get rid of it?

The problem is such: enter image description here

So far my working has been: enter image description here

I'm concerned about the step where the ester forms a ring … The methyl group doesn't look like a plausible leaving group but it does not appear in the product so how can I get rid of it?

The problem is such: enter image description here

So far my working has been:

enter image description here

I'm concerned about the last step where the ester forms a ring … The methyl group doesn't look like a plausible leaving group but it does not appear in the product so how can I get rid of it?

4 deleted 2 characters in body; edited tags; edited title
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Help with How does this bromination reaction mechanismbrominated intermediate loose its methyl group?

The problem is such: enter image description here

So far my working has been: enter image description here

I'm concerned about the step where the ester forms a ring... The methyl group doesntdoesn't look like a plausible leaving group but it does not appear in the product so how can iI get rid of it? Thanks!

Help with this bromination reaction mechanism?

The problem is such: enter image description here

So far my working has been: enter image description here

I'm concerned about the step where the ester forms a ring... The methyl group doesnt look like a plausible leaving group but it does not appear in the product so how can i get rid of it? Thanks!

How does this brominated intermediate loose its methyl group?

The problem is such: enter image description here

So far my working has been: enter image description here

I'm concerned about the step where the ester forms a ring The methyl group doesn't look like a plausible leaving group but it does not appear in the product so how can I get rid of it?

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