[eurych]

Greetings!
I'm having trouble deciding wether the Mg from the Grignard reactive would attach in-between



The problem reads as follows:
"Benzoic anhydride is reacted with Grignard's reactive wich is obtained from 1,4-dichlorobuthane, to finally acidify the medium. Show the mechanism involved".

So, first sorry if it's wrong translated, I'm spanish native though I suspect it is clear. I know the following steps of this reaction, but I don't know if both chlorides are attacked by Mg or just one on one end of the molecule

Cheers! And thank you very much!

[beardy]

Grignards add twice to esters, acid halides, and anhydrides. This looks initial nucleophilic acyl substituion followed by intramolecular grignard reaction. I could be wrong.



The alcohol is tertiary and is adjacent to a phenyl group. Condensation may take place to allow conjugation.