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Carboxylic acid salts or carboxylate salts are organic compounds that have a -C(=O)O- anionic group in them. Carboxylate salts have the general formula M(RCOO)n, where M is a metal or a cation like ammonium. The negative charge delocalizes between the oxygen atoms. Carboxylic acid salts are extensively used in the preparation of buffer solutions. They also find utility as flavor enhancers and preservatives. Sodium salts of benzoic acid and formic acid are frequently used in organic synthesis as nucleophilic agents. Pyrolysis of calcium salts is a route to the preparation of ketones. The ammonium salt of carboxylic acid is used in the preparation of carboxamides. Industrially, sodium or potassium salts of long chain fatty acids are used in the manufacture of the anionic surfactant soap.
Thiocarboxylic acid salts or thiocarboxylate salts are organic compounds that have -C(=O)S- anionic group in them. Thiocarboxylates have elicited considerable interest among researchers. They form a number of complexes with metal ions. Some of these metal-complexes are employed as precursors to the corresponding metal sulfide. Potassium thioacetate is used as a thiolating agent in the preparation of thiols from a variety of halides. Thiocarboxylates are useful as monomers for the synthesis of polymers, for instance, arylene sulfide polymers. Silver thiocarboxylates are precursors for the preparation of silver nanoparticles.