Jump to content

MgBr+ -- Where is the charge at? What is the name of it?


Genecks
 Share

Recommended Posts

I'm looking over synthesizing alcohols with grignard reagents.

 

I'm going batty trying to figure out where the positive charge is on MgBr+.

Is it on the Br? The Mg? Is it localized all over, as in [H3O]+? Thus being [MgBr]+?

 

Also, what is the name of the MgBr+?

 

ChemSketch didn't seem to help in this department.

Edited by Genecks
Link to comment
Share on other sites

The positive charge would lie on the magnesium. MgBr+ is simply a magnesium bromide ion. This species doesn't have much of anything to do with the actual Grignard reaction though. At the end of a Grignard reaction you get Mg(OH)Br, which then goes on to react with the acid you'd have in solution to form water, bromide ions and Mg2+.

Have a read of this, it might help.

 

 

Edited by hypervalent_iodine
Link to comment
Share on other sites

I think MgBr+ might be written in the equation showing Grignard reaction.

 

This species represents Mg2+ and Br-. But these ions exist in the aqueous solution separately.

 

A Grignard reagent exists in what's called the Schlenck Equilibrim. The alkyl magnesium bromide is in equilibrium with a dihalomagnesium and dialkylmagnesium species. It has been postulated but not confirmed that a halomagnesium cluster is involved as well.

Edited by mississippichem
Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.