+ +8 + 2 +

Reduction of acetic anhydride by lithium aluminium hydride in dry diethyl ether or THF gives two moles of ethanol (after an aqueous work-up).

The reaction probably starts with an SN2 displacement of acetate ion but both organic products are rapidly reduced all the way down to alkoxide salts.

Reaction defined as:
Functional Group Interconvertion
Multistep: LA/B mechanism
Reduction: Of Substrate By Reagent