# IUPAC nomenclature of molecules containing alkoxide and carboxylate groups

I am studying for my A levels and recently came across the above-mentioned reaction.

I tried to think up a name like disodium 4-oxidebutanoate, but this is not based on any IUPAC rule. Internet searches have revealed no name for this, at least to me.

This compound is both an alkoxide ion and an alkanoate ion. How are such compounds named?

According to Subsection P-72.6.2 of Nomenclature of Organic Chemistry – IUPAC Recommendations and Preferred Names 2013 (Blue Book), the prefix for the anionic group $\ce{-O^-}$ is ‘oxido’. (The prefixes is derived from the name oxide by changing the final letter ‘e’ to ‘o’.) Therefore, the name of the dianion that is shown in the question is 4-oxidobutanoate. The complete name of the salt is disodium 4-oxidobutanoate.