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


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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
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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
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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
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