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Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: sharbeldam on September 02, 2019, 05:26:54 AM

Title: urgent help, CH3- to CH3Br
Post by: sharbeldam on September 02, 2019, 05:26:54 AM

How can i get ch3br from ch3-?
what i had in my mind is this, please tell me if it works. either i react the ch3- with Br2 but not sure that would work.
or i react it with an acid, it takes a hydrogen from the acid to become CH4 and then i react ch4 with Br2 (with heat or UV)

Title: Re: urgent help, CH3- to CH3Br
Post by: chenbeier on September 02, 2019, 06:03:32 AM

What is CH₃-? Methyl is not an compound which exist. You have to use CH₄ or something to get it between.

Title: Re: urgent help, CH3- to CH3Br
Post by: sharbeldam on September 02, 2019, 06:09:26 AM

I understand that which was confusing, but its an exam synthesis problem... it was actually CH3CH2- but same concept

Title: Re: urgent help, CH3- to CH3Br
Post by: rolnor on September 02, 2019, 06:37:21 AM

Do you mean like CH3Li? Or a free radical?

Title: Re: urgent help, CH3- to CH3Br
Post by: sharbeldam on September 02, 2019, 07:08:34 AM

so its not just me, there is something wrong with this question...
Apologies.

Title: Re: urgent help, CH3- to CH3Br
Post by: kriggy on September 02, 2019, 08:34:10 AM

Can you copy the exact equestion here?

I think it might be how to convert CH3-R to BrCH2-R ?

Title: Re: urgent help, CH3- to CH3Br
Post by: Babcock_Hall on September 02, 2019, 09:44:11 AM

@OP,

Free radical bromination is occasionally synthetically useful, but often it is not.  Can you explain to us why it often is not useful?

Title: Re: urgent help, CH3- to CH3Br
Post by: sharbeldam on September 02, 2019, 11:25:53 AM

Well I cant wait for next year to start working in a lab to find out all these stuff because until now i only solve on paper only.
but i can only think of two options... maybe that it requires a lot of energy or too expensive?

Title: Re: urgent help, CH3- to CH3Br
Post by: Babcock_Hall on September 02, 2019, 01:49:52 PM

One disadvantage is that mixtures are produced, and much of what controls the proportion of the mixture is how stable the carbon-centered radical intermediate is.  This may or may not apply to your problem.