In organic chemistry, Eschenmoser's salt (named for Albert Eschenmoser) is the ionic, organic compound .  It is the iodide salt of the dimethylaminomethylene cation .
The dimethylaminomethylene cation is a strong dimethylaminomethylating agent, used to prepare derivatives of the type .  Enolates, silyl enol ethers, and even more acidic ketones undergo efficient dimethylaminomethylation.  Once prepared, such tertiary amines can be further methylated and then subjected to base-induced elimination to afford methylidenated ketones. The salt was first prepared by the group of Albert Eschenmoser after whom the reagent is named.