March 29, 2024, 09:45:49 AM
Forum Rules: Read This Before Posting


Topic: Help with mechanism/chair confirmation  (Read 2929 times)

0 Members and 1 Guest are viewing this topic.

Offline mrkitty

  • New Member
  • **
  • Posts: 5
  • Mole Snacks: +1/-0
Help with mechanism/chair confirmation
« on: December 04, 2011, 01:01:43 AM »
Hi there, I am new here. I am having problems understanding a question from a worksheet. I can do the mechanism for hydrobromination, but I am confused about how to put it into the two chair confirmations.

Offline fledarmus

  • Chemist
  • Sr. Member
  • *
  • Posts: 1675
  • Mole Snacks: +203/-28
Re: Help with mechanism/chair confirmation
« Reply #1 on: December 04, 2011, 10:39:33 AM »
Start with the first step then - which carbon of the alkene will be brominated?

Offline mrkitty

  • New Member
  • **
  • Posts: 5
  • Mole Snacks: +1/-0
Re: Help with mechanism/chair confirmation
« Reply #2 on: December 04, 2011, 02:41:02 PM »
Ok, so I have been looking at just the mechanism for halogenation, because the mechanisms I have say that hydrohalogenation requires a halogen, bromine, to be bonded to an H. The reaction given in the question shows a Br2. Is this still hydrohalogenation?

Thanks for the reply

Offline mrkitty

  • New Member
  • **
  • Posts: 5
  • Mole Snacks: +1/-0
Re: Help with mechanism/chair confirmation
« Reply #3 on: December 04, 2011, 02:50:48 PM »
Also, does the Cl bonded onto the alkene have any effect on the reaction/product?

Thanks again

Offline Dan

  • Retired Staff
  • Sr. Member
  • *
  • Posts: 4716
  • Mole Snacks: +469/-72
  • Gender: Male
  • Organic Chemist
    • My research
Re: Help with mechanism/chair confirmation
« Reply #4 on: December 05, 2011, 04:00:10 AM »
The reaction given in the question shows a Br2. Is this still hydrohalogenation?

There is a mistake in the question. The text refers to hydrobromination, but the conditions are for bromination - which is not the same thing.

I would assume the reagents are correct and the text has the mistake.
My research: Google Scholar and Researchgate

Offline fledarmus

  • Chemist
  • Sr. Member
  • *
  • Posts: 1675
  • Mole Snacks: +203/-28
Re: Help with mechanism/chair confirmation
« Reply #5 on: December 05, 2011, 07:36:25 AM »
heh - sorry, I was assuming just the opposite, that the text was correct and that water had been left out of the reagents.

Dan is correct - there is a mistake somewhere!

Sponsored Links