# Mechanism for acylation of benzene with succinic anhydride [duplicate]

I've just started with EAS. I wanted to write down a mechanism for acylation of a cyclic anhydride (for some reason the formation of the carbocation is not given in my textbook). So I wish to know whether this mechanism is correct or now. Since this is my first attempt at writing one, I don't know whether it's correct.

The reaction:

What I came up with:

• @orthocresol I haven't really made any nontrivial contributions to Chemistry SE. Once I have contributed something of value, I will perhaps be in a position to post proposals and suggestions on Meta. I have deleted my previous comments as they're off-topic here. – Rodrigo de Azevedo Jul 1 at 16:15
• @RodrigodeAzevedo, I think (I hope) that meta here is fairly open, and tags are a pretty easy topic to get introduced to meta rather than commenting on heavyweight topics like closure etc. But of course, it's up to you! – orthocresol Jul 1 at 16:54

The mechanism shown in the question seems reasonable enough to me. I would note that ring opening before the attack on the $\pi$-system is likely, but not absolutely necessary. Loss of $\ce{AlCl3}$ may not occur until workup. Direct proton transfer seems unlikely, but is a inconsequential detail. Note however, that the electron pushing arrow is drawn opposite to what it needs to be for that transfer.