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Topic: Exercise alkene reactions  (Read 2892 times)

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Offline sloper

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Exercise alkene reactions
« on: May 22, 2013, 04:20:40 PM »
1) When 3-methyl-1-butene reacts with HBr,two alkyl halides are formed:2-bromo-3-methylbutane and 2-bromo-2-methylbutane.Propose a mechanism that explains the formation of these products

I know the mechanism to get 2-bromo-3-methylbutane by Markovnikov's rule, but how do I get the other product?

And from the picture, what it means to prepare a compound?
And what is the solution to question 6?


It will help alot, thanks.

Offline orgopete

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Re: Exercise alkene reactions
« Reply #1 on: May 22, 2013, 08:21:05 PM »
I think the comment at 6d) gives a clue. I presume this must have been discussed in class or in your book.
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Offline camptzak

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Re: Exercise alkene reactions
« Reply #2 on: May 23, 2013, 12:22:57 AM »
as for the first question, look up "hydride s#*$"
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Offline sloper

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Re: Exercise alkene reactions
« Reply #3 on: May 24, 2013, 09:53:10 AM »
looking for hydride (catalytic hydrogenation) did help, can you tip with what to search for question 6?
thanks!

Offline Dan

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Re: Exercise alkene reactions
« Reply #4 on: May 24, 2013, 10:00:44 AM »
looking for hydride (catalytic hydrogenation) did help, can you tip with what to search for question 6?
thanks!

I think you misinterpreted camptzak's post - he meant "hydride shift", but seems to have made an unfortunate typo that was censored by the swearing filter....
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Offline kriggy

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Re: Exercise alkene reactions
« Reply #5 on: May 24, 2013, 01:28:24 PM »

I know the mechanism to get 2-bromo-3-methylbutane by Markovnikov's rule, but how do I get the other product?

Looked into my notes and it gives simlar example as you have:
C=CC+HBr -> electrophilic addition : CC(Br)C or radical addition C(Br)CC so I guess it could go with both radical or electrophilic mechanism and you will probably get a mixture of both unless you set up condtions which favors one or another

Offline discodermolide

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Re: Exercise alkene reactions
« Reply #6 on: May 24, 2013, 10:41:11 PM »
I think the comment at 6d) gives a clue. I presume this must have been discussed in class or in your book.

As was said in the quote the clue is in the comment.
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