4-Nitrobenzoic acid can be used:
- As a co-catalyst with thioxotetrahydropyrimidinone for the α-alkylation of ketones.[1]
- For the synthesis of mononuclear zinc carboxylate complexes by reacting with zinc sulfate heptahydrate and NaOH.[2]
- As an additive in the room temperature catalytic Wittig reaction.[3]