Editing Acetic anhydride (section)

===Enolate formation===
Acetic anhydride forms the enolate in the presence of [[acetate]] as base.  The enolate can be [[chemical trap|trapped]] by condenation with [[benzaldehyde]].  In the 19th century, this chemistry,  the [[Perkin reaction]], was used for the production of [[cinnamic acid]]:<ref>{{Cite book |last=Lassar-Cohn |first=Dr |url=https://books.google.com/books?id=KxhIAAAAIAAJ&pg=PA104 |title=A Laboratory Manual of Organic Chemistry: A Compendium of Laboratory Methods for the Use of Chemists, Physicians, and Pharmacists |last2=Smith |first2=Alexander |date=1895 |publisher=Macmillian and Company Limited |language=en}}</ref>
:{{chem2|(CH3CO)2O  +  C6H5CHO  ->  C6H5CH\dCHCO2H  +  CH3CO2H}}