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Topic: What is the major product in this rxn?  (Read 1782 times)

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Offline MJF

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What is the major product in this rxn?
« on: January 25, 2014, 12:14:58 PM »
CH3-C≡C-CH3   HBR (excess)         ?

I understand that this is an addition reaction with the use of the strong acid, HBr and that H and Br will be added to the reaction. The question is where exactly? The way our professor teaches us is that, in this case, the C with more H attached to it will receive the extra H, while the C with the least amount of H attached will receive the Br. The problem I have is that both Carbons have no H attached, just R groups.

After going over the problem, I checked the answer and it was: CH3-CHBR-CHBR-CH3. Can anyone help me with this?

Offline discodermolide

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Re: What is the major product in this rxn?
« Reply #1 on: January 25, 2014, 12:18:31 PM »
This is a reaction of the triple bond with HBr.

Do you know how HBr adds to C=C bonds? If so try and apply it to the triple bond case.
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